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authorKent Overstreet <kmo@daterainc.com>2013-07-08 15:19:18 -0700
committerKent Overstreet <kmo@daterainc.com>2013-08-07 10:54:17 -0700
commit78742d998597406b336a6d8b3483b060469ebc79 (patch)
treef33f8d8ca570e9725ebb1ba3990fd99d33be7d81
parent3d52184ce9963200614691780d8e045817f847fb (diff)
idr: Remove unneeded idr locking, idr_preload() usage
Our new idr implementation does its own locking, instead of forcing it onto the callers like the old implementation. Many of the existing idr users need locking for more than just idr_alloc()/idr_remove()/idr_find() - they're taking refcounts and such under their locks and we can't touch those. But a significant number of users had locks that protected nothing more than the idr data structures itself - those we can get rid of. Note that we have to be careful when removing locks; in some places, locks appear to only be protecting idr_alloc()/idr_remove() calls but they're also used by other code that needs to ensure the idr isn't modified while it's doing something else - so ideally we want to delete the lock that protected the idr, or else we have to carefully audit all the other places it's used. There's also a fair number of places where things were being done under the idr lock unnecessarily; drivers/dca/dca-sysfs.c is a good example. dca->id is set to the id idr_alloc() returns under the lock - but there's no idr_find() calls under the lock, and dca->id isn't touched in the idr_remove() paths. So the lock can be safely deleted. The really nice thing about deleting this unnecessary locking is that it lets us trivially delete a lot of now unnecessary idr_preload() - with idr doing its own locking, we can pass GFP_KERNEL to idr_alloc() just fine. Signed-off-by: Kent Overstreet <kmo@daterainc.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Tejun Heo <tj@kernel.org> Cc: David Airlie <airlied@linux.ie> Cc: Tom Tucker <tom@opengridcomputing.com> Cc: Steve Wise <swise@opengridcomputing.com> Cc: Roland Dreier <roland@kernel.org> Cc: Sean Hefty <sean.hefty@intel.com> Cc: Hal Rosenstock <hal.rosenstock@gmail.com> Cc: Alasdair Kergon <agk@redhat.com> Cc: dm-devel@redhat.com Cc: Samuel Ortiz <sameo@linux.intel.com> Cc: Alex Dubov <oakad@yahoo.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Chris Ball <cjb@laptop.org> Cc: "James E.J. Bottomley" <JBottomley@parallels.com> Cc: Willem Riede <osst@riede.org> Cc: "Kai Mäkisara" <Kai.Makisara@kolumbus.fi> Cc: "Nicholas A. Bellinger" <nab@linux-iscsi.org> Cc: Li Zefan <lizefan@huawei.com> Cc: Vlad Yasevich <vyasevich@gmail.com> Cc: Neil Horman <nhorman@tuxdriver.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Dave Airlie <airlied@redhat.com> Cc: Alon Levy <alevy@redhat.com> Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Cc: Christoph Hellwig <hch@lst.de> Cc: linux-kernel@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: linux-rdma@vger.kernel.org Cc: linux-mmc@vger.kernel.org Cc: linux-scsi@vger.kernel.org Cc: osst-users@lists.sourceforge.net Cc: target-devel@vger.kernel.org Cc: containers@lists.linux-foundation.org Cc: cgroups@vger.kernel.org Cc: linux-sctp@vger.kernel.org Cc: netdev@vger.kernel.org
-rw-r--r--drivers/dca/dca-sysfs.c18
-rw-r--r--drivers/gpu/drm/qxl/qxl_cmd.c4
-rw-r--r--drivers/gpu/drm/qxl/qxl_drv.h1
-rw-r--r--drivers/gpu/drm/qxl/qxl_kms.c1
-rw-r--r--drivers/gpu/drm/qxl/qxl_release.c20
-rw-r--r--drivers/infiniband/hw/amso1100/c2.h1
-rw-r--r--drivers/infiniband/hw/amso1100/c2_qp.c20
-rw-r--r--drivers/md/dm.c24
-rw-r--r--drivers/memstick/core/memstick.c17
-rw-r--r--drivers/mfd/rtsx_pcr.c13
-rw-r--r--drivers/misc/c2port/core.c11
-rw-r--r--drivers/misc/tifm_core.c15
-rw-r--r--drivers/mmc/core/host.c13
-rw-r--r--drivers/scsi/ch.c13
-rw-r--r--drivers/scsi/st.c13
-rw-r--r--drivers/target/iscsi/iscsi_target.c17
-rw-r--r--drivers/target/iscsi/iscsi_target.h1
-rw-r--r--drivers/target/iscsi/iscsi_target_login.c12
-rw-r--r--include/linux/cgroup.h1
-rw-r--r--include/net/sctp/sctp.h1
-rw-r--r--kernel/cgroup.c9
-rw-r--r--kernel/workqueue.c15
-rw-r--r--net/9p/util.c15
-rw-r--r--net/sctp/associola.c14
-rw-r--r--net/sctp/protocol.c1
-rw-r--r--net/sctp/socket.c2
26 files changed, 41 insertions, 231 deletions
diff --git a/drivers/dca/dca-sysfs.c b/drivers/dca/dca-sysfs.c
index effda6679350..6be5fbd88efb 100644
--- a/drivers/dca/dca-sysfs.c
+++ b/drivers/dca/dca-sysfs.c
@@ -31,7 +31,6 @@
static struct class *dca_class;
static struct idr dca_idr;
-static spinlock_t dca_idr_lock;
int dca_sysfs_add_req(struct dca_provider *dca, struct device *dev, int slot)
{
@@ -55,23 +54,15 @@ int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev)
struct device *cd;
int ret;
- idr_preload(GFP_KERNEL);
- spin_lock(&dca_idr_lock);
-
- ret = idr_alloc(&dca_idr, dca, GFP_NOWAIT);
- if (ret >= 0)
- dca->id = ret;
-
- spin_unlock(&dca_idr_lock);
- idr_preload_end();
+ ret = idr_alloc(&dca_idr, dca, GFP_KERNEL);
if (ret < 0)
return ret;
+ dca->id = ret;
+
cd = device_create(dca_class, dev, MKDEV(0, 0), NULL, "dca%d", dca->id);
if (IS_ERR(cd)) {
- spin_lock(&dca_idr_lock);
idr_remove(&dca_idr, dca->id);
- spin_unlock(&dca_idr_lock);
return PTR_ERR(cd);
}
dca->cd = cd;
@@ -82,15 +73,12 @@ void dca_sysfs_remove_provider(struct dca_provider *dca)
{
device_unregister(dca->cd);
dca->cd = NULL;
- spin_lock(&dca_idr_lock);
idr_remove(&dca_idr, dca->id);
- spin_unlock(&dca_idr_lock);
}
int __init dca_sysfs_init(void)
{
idr_init(&dca_idr);
- spin_lock_init(&dca_idr_lock);
dca_class = class_create(THIS_MODULE, "dca");
if (IS_ERR(dca_class)) {
diff --git a/drivers/gpu/drm/qxl/qxl_cmd.c b/drivers/gpu/drm/qxl/qxl_cmd.c
index 555a698e83ea..e01f7d541a47 100644
--- a/drivers/gpu/drm/qxl/qxl_cmd.c
+++ b/drivers/gpu/drm/qxl/qxl_cmd.c
@@ -449,11 +449,9 @@ int qxl_surface_id_alloc(struct qxl_device *qdev,
int idr_ret;
int count = 0;
again:
- idr_preload(GFP_ATOMIC);
spin_lock(&qdev->surf_id_idr_lock);
- idr_ret = idr_alloc_range(&qdev->surf_id_idr, NULL, 1, 0, GFP_NOWAIT);
+ idr_ret = idr_alloc_range(&qdev->surf_id_idr, NULL, 1, 0, GFP_ATOMIC);
spin_unlock(&qdev->surf_id_idr_lock);
- idr_preload_end();
if (idr_ret < 0)
return idr_ret;
handle = idr_ret;
diff --git a/drivers/gpu/drm/qxl/qxl_drv.h b/drivers/gpu/drm/qxl/qxl_drv.h
index 7e96f4f11738..df25af507c73 100644
--- a/drivers/gpu/drm/qxl/qxl_drv.h
+++ b/drivers/gpu/drm/qxl/qxl_drv.h
@@ -285,7 +285,6 @@ struct qxl_device {
uint64_t va_slot_mask;
struct idr release_idr;
- spinlock_t release_idr_lock;
struct mutex async_io_mutex;
unsigned int last_sent_io_cmd;
diff --git a/drivers/gpu/drm/qxl/qxl_kms.c b/drivers/gpu/drm/qxl/qxl_kms.c
index 9e8da9ee9731..396c1eb00542 100644
--- a/drivers/gpu/drm/qxl/qxl_kms.c
+++ b/drivers/gpu/drm/qxl/qxl_kms.c
@@ -204,7 +204,6 @@ int qxl_device_init(struct qxl_device *qdev,
GFP_KERNEL);
idr_init(&qdev->release_idr);
- spin_lock_init(&qdev->release_idr_lock);
idr_init(&qdev->surf_id_idr);
spin_lock_init(&qdev->surf_id_idr_lock);
diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c
index 7cbe62a0493c..6cb2c83b037d 100644
--- a/drivers/gpu/drm/qxl/qxl_release.c
+++ b/drivers/gpu/drm/qxl/qxl_release.c
@@ -44,7 +44,6 @@ qxl_release_alloc(struct qxl_device *qdev, int type,
struct qxl_release **ret)
{
struct qxl_release *release;
- int handle;
size_t size = sizeof(*release);
int idr_ret;
@@ -58,21 +57,16 @@ qxl_release_alloc(struct qxl_device *qdev, int type,
release->surface_release_id = 0;
INIT_LIST_HEAD(&release->bos);
- idr_preload(GFP_KERNEL);
- spin_lock(&qdev->release_idr_lock);
- idr_ret = idr_alloc_range(&qdev->release_idr,
- release, 1, 0, GFP_NOWAIT);
- spin_unlock(&qdev->release_idr_lock);
- idr_preload_end();
- handle = idr_ret;
+ idr_ret = idr_alloc_range(&qdev->release_idr, release,
+ 1, 0, GFP_KERNEL);
if (idr_ret < 0)
goto release_fail;
*ret = release;
- QXL_INFO(qdev, "allocated release %lld\n", handle);
- release->id = handle;
+ QXL_INFO(qdev, "allocated release %lld\n", idr_ret);
+ release->id = idr_ret;
release_fail:
- return handle;
+ return idr_ret;
}
void
@@ -94,9 +88,7 @@ qxl_release_free(struct qxl_device *qdev,
qxl_fence_remove_release(&bo->fence, release->id);
qxl_bo_unref(&bo);
}
- spin_lock(&qdev->release_idr_lock);
idr_remove(&qdev->release_idr, release->id);
- spin_unlock(&qdev->release_idr_lock);
kfree(release);
}
@@ -279,9 +271,7 @@ struct qxl_release *qxl_release_from_id_locked(struct qxl_device *qdev,
{
struct qxl_release *release;
- spin_lock(&qdev->release_idr_lock);
release = idr_find(&qdev->release_idr, id);
- spin_unlock(&qdev->release_idr_lock);
if (!release) {
DRM_ERROR("failed to find id in release_idr\n");
return NULL;
diff --git a/drivers/infiniband/hw/amso1100/c2.h b/drivers/infiniband/hw/amso1100/c2.h
index d619d735838b..73f2e9601583 100644
--- a/drivers/infiniband/hw/amso1100/c2.h
+++ b/drivers/infiniband/hw/amso1100/c2.h
@@ -264,7 +264,6 @@ struct c2_pd_table {
struct c2_qp_table {
struct idr idr;
- spinlock_t lock;
};
struct c2_element {
diff --git a/drivers/infiniband/hw/amso1100/c2_qp.c b/drivers/infiniband/hw/amso1100/c2_qp.c
index 86708dee58b1..cb80aa92243c 100644
--- a/drivers/infiniband/hw/amso1100/c2_qp.c
+++ b/drivers/infiniband/hw/amso1100/c2_qp.c
@@ -380,36 +380,21 @@ static int destroy_qp(struct c2_dev *c2dev, struct c2_qp *qp)
static int c2_alloc_qpn(struct c2_dev *c2dev, struct c2_qp *qp)
{
- int ret;
-
- idr_preload(GFP_KERNEL);
- spin_lock_irq(&c2dev->qp_table.lock);
-
- ret = idr_alloc_cyclic(&c2dev->qp_table.idr, qp, 0, 0, GFP_NOWAIT);
+ int ret = idr_alloc_cyclic(&c2dev->qp_table.idr, qp, 0, 0, GFP_KERNEL);
if (ret >= 0)
qp->qpn = ret;
- spin_unlock_irq(&c2dev->qp_table.lock);
- idr_preload_end();
return ret < 0 ? ret : 0;
}
static void c2_free_qpn(struct c2_dev *c2dev, int qpn)
{
- spin_lock_irq(&c2dev->qp_table.lock);
idr_remove(&c2dev->qp_table.idr, qpn);
- spin_unlock_irq(&c2dev->qp_table.lock);
}
struct c2_qp *c2_find_qpn(struct c2_dev *c2dev, int qpn)
{
- unsigned long flags;
- struct c2_qp *qp;
-
- spin_lock_irqsave(&c2dev->qp_table.lock, flags);
- qp = idr_find(&c2dev->qp_table.idr, qpn);
- spin_unlock_irqrestore(&c2dev->qp_table.lock, flags);
- return qp;
+ return idr_find(&c2dev->qp_table.idr, qpn);
}
int c2_alloc_qp(struct c2_dev *c2dev,
@@ -1014,7 +999,6 @@ out:
void c2_init_qp_table(struct c2_dev *c2dev)
{
- spin_lock_init(&c2dev->qp_table.lock);
idr_init(&c2dev->qp_table.idr);
}
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index c63d35a08fac..321e8910b4ad 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1812,9 +1812,7 @@ static int dm_any_congested(void *congested_data, int bdi_bits)
*---------------------------------------------------------------*/
static void free_minor(int minor)
{
- spin_lock(&_minor_lock);
idr_remove(&_minor_idr, minor);
- spin_unlock(&_minor_lock);
}
/*
@@ -1827,14 +1825,8 @@ static int specific_minor(int minor)
if (minor >= (1 << MINORBITS))
return -EINVAL;
- idr_preload(GFP_KERNEL);
- spin_lock(&_minor_lock);
-
- r = idr_alloc_range(&minor_idr, MINOR_ALLOCED,
- minor, minor + 1, GFP_NOWAIT);
-
- spin_unlock(&_minor_lock);
- idr_preload_end();
+ r = idr_alloc_range(&_minor_idr, MINOR_ALLOCED, minor,
+ minor + 1, GFP_KERNEL);
if (r < 0)
return r == -ENOSPC ? -EBUSY : r;
return 0;
@@ -1844,14 +1836,8 @@ static int next_free_minor(int *minor)
{
int r;
- idr_preload(GFP_KERNEL);
- spin_lock(&_minor_lock);
-
- r = idr_alloc_range(&minor_idr, MINOR_ALLOCED, 0,
- 1 << MINORBITS, GFP_NOWAIT);
-
- spin_unlock(&_minor_lock);
- idr_preload_end();
+ r = idr_alloc_range(&_minor_idr, MINOR_ALLOCED,
+ 0, 1 << MINORBITS, GFP_KERNEL);
if (r < 0)
return r;
*minor = r;
@@ -1962,9 +1948,7 @@ static struct mapped_device *alloc_dev(int minor)
md->flush_bio.bi_rw = WRITE_FLUSH;
/* Populate the mapping, nobody knows we exist yet */
- spin_lock(&_minor_lock);
old_md = idr_replace(&_minor_idr, md, minor);
- spin_unlock(&_minor_lock);
BUG_ON(old_md != MINOR_ALLOCED);
diff --git a/drivers/memstick/core/memstick.c b/drivers/memstick/core/memstick.c
index 70fb07c6f1d9..b7544a3a056f 100644
--- a/drivers/memstick/core/memstick.c
+++ b/drivers/memstick/core/memstick.c
@@ -26,7 +26,6 @@ module_param(cmd_retries, uint, 0644);
static struct workqueue_struct *workqueue;
static DEFINE_IDR(memstick_host_idr);
-static DEFINE_SPINLOCK(memstick_host_lock);
static int memstick_dev_match(struct memstick_dev *card,
struct memstick_device_id *id)
@@ -512,25 +511,17 @@ int memstick_add_host(struct memstick_host *host)
{
int rc;
- idr_preload(GFP_KERNEL);
- spin_lock(&memstick_host_lock);
-
- rc = idr_alloc(&memstick_host_idr, host, GFP_NOWAIT);
- if (rc >= 0)
- host->id = rc;
-
- spin_unlock(&memstick_host_lock);
- idr_preload_end();
+ rc = idr_alloc(&memstick_host_idr, host, GFP_KERNEL);
if (rc < 0)
return rc;
+ host->id = rc;
+
dev_set_name(&host->dev, "memstick%u", host->id);
rc = device_add(&host->dev);
if (rc) {
- spin_lock(&memstick_host_lock);
idr_remove(&memstick_host_idr, host->id);
- spin_unlock(&memstick_host_lock);
return rc;
}
@@ -554,9 +545,7 @@ void memstick_remove_host(struct memstick_host *host)
host->set_param(host, MEMSTICK_POWER, MEMSTICK_POWER_OFF);
mutex_unlock(&host->lock);
- spin_lock(&memstick_host_lock);
idr_remove(&memstick_host_idr, host->id);
- spin_unlock(&memstick_host_lock);
device_del(&host->dev);
}
EXPORT_SYMBOL(memstick_remove_host);
diff --git a/drivers/mfd/rtsx_pcr.c b/drivers/mfd/rtsx_pcr.c
index 862deedbe631..be5913a9f48d 100644
--- a/drivers/mfd/rtsx_pcr.c
+++ b/drivers/mfd/rtsx_pcr.c
@@ -40,7 +40,6 @@ module_param(msi_en, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(msi_en, "Enable MSI");
static DEFINE_IDR(rtsx_pci_idr);
-static DEFINE_SPINLOCK(rtsx_pci_lock);
static struct mfd_cell rtsx_pcr_cells[] = {
[RTSX_SD_CARD] = {
@@ -1101,16 +1100,12 @@ static int rtsx_pci_probe(struct pci_dev *pcidev,
}
handle->pcr = pcr;
- idr_preload(GFP_KERNEL);
- spin_lock(&rtsx_pci_lock);
- ret = idr_alloc(&rtsx_pci_idr, pcr, GFP_NOWAIT);
- if (ret >= 0)
- pcr->id = ret;
- spin_unlock(&rtsx_pci_lock);
- idr_preload_end();
+ ret = idr_alloc(&rtsx_pci_idr, pcr, GFP_KERNEL);
if (ret < 0)
goto free_handle;
+ pcr->id = ret;
+
pcr->pci = pcidev;
dev_set_drvdata(&pcidev->dev, handle);
@@ -1216,9 +1211,7 @@ static void rtsx_pci_remove(struct pci_dev *pcidev)
pci_release_regions(pcidev);
pci_disable_device(pcidev);
- spin_lock(&rtsx_pci_lock);
idr_remove(&rtsx_pci_idr, pcr->id);
- spin_unlock(&rtsx_pci_lock);
kfree(pcr->slots);
kfree(pcr);
diff --git a/drivers/misc/c2port/core.c b/drivers/misc/c2port/core.c
index 8a1ab10f2b43..5cd8c9939a4b 100644
--- a/drivers/misc/c2port/core.c
+++ b/drivers/misc/c2port/core.c
@@ -27,7 +27,6 @@
#define DRIVER_NAME "c2port"
#define DRIVER_VERSION "0.51.0"
-static DEFINE_SPINLOCK(c2port_idr_lock);
static DEFINE_IDR(c2port_idr);
/*
@@ -897,11 +896,7 @@ struct c2port_device *c2port_device_register(char *name,
if (unlikely(!c2dev))
return ERR_PTR(-ENOMEM);
- idr_preload(GFP_KERNEL);
- spin_lock_irq(&c2port_idr_lock);
- ret = idr_alloc(&c2port_idr, c2dev, GFP_NOWAIT);
- spin_unlock_irq(&c2port_idr_lock);
- idr_preload_end();
+ ret = idr_alloc(&c2port_idr, c2dev, GFP_KERNEL);
if (ret < 0)
goto error_idr_alloc;
@@ -941,9 +936,7 @@ error_device_create_bin_file:
device_destroy(c2port_class, 0);
error_device_create:
- spin_lock_irq(&c2port_idr_lock);
idr_remove(&c2port_idr, c2dev->id);
- spin_unlock_irq(&c2port_idr_lock);
error_idr_alloc:
kfree(c2dev);
@@ -960,9 +953,7 @@ void c2port_device_unregister(struct c2port_device *c2dev)
dev_info(c2dev->dev, "C2 port %s removed\n", c2dev->name);
device_remove_bin_file(c2dev->dev, &c2port_bin_attrs);
- spin_lock_irq(&c2port_idr_lock);
idr_remove(&c2port_idr, c2dev->id);
- spin_unlock_irq(&c2port_idr_lock);
device_destroy(c2port_class, c2dev->id);
diff --git a/drivers/misc/tifm_core.c b/drivers/misc/tifm_core.c
index c828c2790abd..ee7b181cbcc9 100644
--- a/drivers/misc/tifm_core.c
+++ b/drivers/misc/tifm_core.c
@@ -20,7 +20,6 @@
static struct workqueue_struct *workqueue;
static DEFINE_IDR(tifm_adapter_idr);
-static DEFINE_SPINLOCK(tifm_adapter_lock);
static const char *tifm_media_type_name(unsigned char type, unsigned char nt)
{
@@ -196,22 +195,16 @@ int tifm_add_adapter(struct tifm_adapter *fm)
{
int rc;
- idr_preload(GFP_KERNEL);
- spin_lock(&tifm_adapter_lock);
- rc = idr_alloc(&tifm_adapter_idr, fm, GFP_NOWAIT);
- if (rc >= 0)
- fm->id = rc;
- spin_unlock(&tifm_adapter_lock);
- idr_preload_end();
+ rc = idr_alloc(&tifm_adapter_idr, fm, GFP_KERNEL);
if (rc < 0)
return rc;
+ fm->id = rc;
+
dev_set_name(&fm->dev, "tifm%u", fm->id);
rc = device_add(&fm->dev);
if (rc) {
- spin_lock(&tifm_adapter_lock);
idr_remove(&tifm_adapter_idr, fm->id);
- spin_unlock(&tifm_adapter_lock);
}
return rc;
@@ -228,9 +221,7 @@ void tifm_remove_adapter(struct tifm_adapter *fm)
device_unregister(&fm->sockets[cnt]->dev);
}
- spin_lock(&tifm_adapter_lock);
idr_remove(&tifm_adapter_idr, fm->id);
- spin_unlock(&tifm_adapter_lock);
device_del(&fm->dev);
}
EXPORT_SYMBOL(tifm_remove_adapter);
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index dd223fa18fc6..d184bd427e5f 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -55,7 +55,6 @@ void mmc_unregister_host_class(void)
}
static DEFINE_IDR(mmc_host_idr);
-static DEFINE_SPINLOCK(mmc_host_lock);
#ifdef CONFIG_MMC_CLKGATE
static ssize_t clkgate_delay_show(struct device *dev,
@@ -457,16 +456,11 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
/* scanning will be enabled when we're ready */
host->rescan_disable = 1;
- idr_preload(GFP_KERNEL);
- spin_lock(&mmc_host_lock);
- err = idr_alloc(&mmc_host_idr, host, GFP_NOWAIT);
- if (err >= 0)
- host->index = err;
- spin_unlock(&mmc_host_lock);
- idr_preload_end();
+ err = idr_alloc(&mmc_host_idr, host, GFP_KERNEL);
if (err < 0)
goto free;
+ host->index = err;
dev_set_name(&host->class_dev, "mmc%d", host->index);
host->parent = dev;
@@ -574,10 +568,7 @@ EXPORT_SYMBOL(mmc_remove_host);
*/
void mmc_free_host(struct mmc_host *host)
{
- spin_lock(&mmc_host_lock);
idr_remove(&mmc_host_idr, host->index);
- spin_unlock(&mmc_host_lock);
-
put_device(&host->class_dev);
}
diff --git a/drivers/scsi/ch.c b/drivers/scsi/ch.c
index 4e0ffdc5640f..0693879b5888 100644
--- a/drivers/scsi/ch.c
+++ b/drivers/scsi/ch.c
@@ -115,7 +115,6 @@ typedef struct {
} scsi_changer;
static DEFINE_IDR(ch_index_idr);
-static DEFINE_SPINLOCK(ch_index_lock);
static const struct {
unsigned char sense;
@@ -582,15 +581,12 @@ ch_open(struct inode *inode, struct file *file)
int minor = iminor(inode);
mutex_lock(&ch_mutex);
- spin_lock(&ch_index_lock);
ch = idr_find(&ch_index_idr, minor);
if (NULL == ch || scsi_device_get(ch->device)) {
- spin_unlock(&ch_index_lock);
mutex_unlock(&ch_mutex);
return -ENXIO;
}
- spin_unlock(&ch_index_lock);
file->private_data = ch;
mutex_unlock(&ch_mutex);
@@ -905,13 +901,8 @@ static int ch_probe(struct device *dev)
if (NULL == ch)
return -ENOMEM;
- idr_preload(GFP_KERNEL);
- spin_lock(&ch_index_lock);
ret = idr_alloc_range(&ch_index_idr, ch, 0,
- CH_MAX_DEVS + 1, GFP_NOWAIT);
- spin_unlock(&ch_index_lock);
- idr_preload_end();
-
+ CH_MAX_DEVS + 1, GFP_KERNEL);
if (ret < 0) {
if (ret == -ENOSPC)
ret = -ENODEV;
@@ -952,9 +943,7 @@ static int ch_remove(struct device *dev)
{
scsi_changer *ch = dev_get_drvdata(dev);
- spin_lock(&ch_index_lock);
idr_remove(&ch_index_idr, ch->minor);
- spin_unlock(&ch_index_lock);
device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
kfree(ch->dt);
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index 62ac0199f65e..d256410dc98f 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -214,7 +214,6 @@ static void scsi_tape_release(struct kref *);
#define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
static DEFINE_MUTEX(st_ref_mutex);
-static DEFINE_SPINLOCK(st_index_lock);
static DEFINE_SPINLOCK(st_use_lock);
static DEFINE_IDR(st_index_idr);
@@ -235,7 +234,6 @@ static struct scsi_tape *scsi_tape_get(int dev)
struct scsi_tape *STp = NULL;
mutex_lock(&st_ref_mutex);
- spin_lock(&st_index_lock);
STp = idr_find(&st_index_idr, dev);
if (!STp) goto out;
@@ -254,7 +252,6 @@ out_put:
kref_put(&STp->kref, scsi_tape_release);
STp = NULL;
out:
- spin_unlock(&st_index_lock);
mutex_unlock(&st_ref_mutex);
return STp;
}
@@ -4182,12 +4179,8 @@ static int st_probe(struct device *dev)
tpnt->blksize_changed = 0;
mutex_init(&tpnt->lock);
- idr_preload(GFP_KERNEL);
- spin_lock(&st_index_lock);
error = idr_alloc_range(&st_index_idr, tpnt, 0,
- ST_MAX_TAPES + 1, GFP_NOWAIT);
- spin_unlock(&st_index_lock);
- idr_preload_end();
+ ST_MAX_TAPES + 1, GFP_KERNEL);
if (error < 0) {
pr_warn("st: idr allocation failed: %d\n", error);
goto out_put_queue;
@@ -4213,9 +4206,7 @@ static int st_probe(struct device *dev)
out_remove_devs:
remove_cdevs(tpnt);
- spin_lock(&st_index_lock);
idr_remove(&st_index_idr, tpnt->index);
- spin_unlock(&st_index_lock);
out_put_queue:
blk_put_queue(disk->queue);
out_put_disk:
@@ -4239,9 +4230,7 @@ static int st_remove(struct device *dev)
mutex_lock(&st_ref_mutex);
kref_put(&tpnt->kref, scsi_tape_release);
mutex_unlock(&st_ref_mutex);
- spin_lock(&st_index_lock);
idr_remove(&st_index_idr, index);
- spin_unlock(&st_index_lock);
return 0;
}
diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 1e0539ccfdcf..af3a9d534d40 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -59,7 +59,6 @@ static DEFINE_SPINLOCK(np_lock);
static struct idr tiqn_idr;
struct idr sess_idr;
struct mutex auth_id_lock;
-spinlock_t sess_idr_lock;
struct iscsit_global *iscsit_global;
@@ -147,22 +146,17 @@ struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
tiqn->tiqn_state = TIQN_STATE_ACTIVE;
- idr_preload(GFP_KERNEL);
- spin_lock(&tiqn_lock);
-
- ret = idr_alloc(&tiqn_idr, NULL, GFP_NOWAIT);
+ ret = idr_alloc(&tiqn_idr, NULL, GFP_KERNEL);
if (ret < 0) {
pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
- spin_unlock(&tiqn_lock);
- idr_preload_end();
kfree(tiqn);
return ERR_PTR(ret);
}
tiqn->tiqn_index = ret;
- list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
+ spin_lock(&tiqn_lock);
+ list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
spin_unlock(&tiqn_lock);
- idr_preload_end();
pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
@@ -201,8 +195,8 @@ void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
spin_lock(&tiqn_lock);
list_del(&tiqn->tiqn_list);
- idr_remove(&tiqn_idr, tiqn->tiqn_index);
spin_unlock(&tiqn_lock);
+ idr_remove(&tiqn_idr, tiqn->tiqn_index);
pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
tiqn->tiqn);
@@ -519,7 +513,6 @@ static int __init iscsi_target_init_module(void)
return -1;
}
mutex_init(&auth_id_lock);
- spin_lock_init(&sess_idr_lock);
idr_init(&tiqn_idr);
idr_init(&sess_idr);
@@ -4449,9 +4442,7 @@ int iscsit_close_session(struct iscsi_session *sess)
pr_debug("Decremented number of active iSCSI Sessions on"
" iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
- spin_lock(&sess_idr_lock);
idr_remove(&sess_idr, sess->session_index);
- spin_unlock(&sess_idr_lock);
kfree(sess->sess_ops);
sess->sess_ops = NULL;
diff --git a/drivers/target/iscsi/iscsi_target.h b/drivers/target/iscsi/iscsi_target.h
index 2c437cb8ca00..db52ddd8ebe6 100644
--- a/drivers/target/iscsi/iscsi_target.h
+++ b/drivers/target/iscsi/iscsi_target.h
@@ -43,7 +43,6 @@ extern struct kmem_cache *lio_r2t_cache;
extern struct idr sess_idr;
extern struct mutex auth_id_lock;
-extern spinlock_t sess_idr_lock;
#endif /*** ISCSI_TARGET_H ***/
diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c
index 4da42b0cc821..176cd56917a1 100644
--- a/drivers/target/iscsi/iscsi_target_login.c
+++ b/drivers/target/iscsi/iscsi_target_login.c
@@ -289,14 +289,7 @@ static int iscsi_login_zero_tsih_s1(
spin_lock_init(&sess->session_usage_lock);
spin_lock_init(&sess->ttt_lock);
- idr_preload(GFP_KERNEL);
- spin_lock_bh(&sess_idr_lock);
- ret = idr_alloc(&sess_idr, NULL, GFP_NOWAIT);
- if (ret >= 0)
- sess->session_index = ret;
- spin_unlock_bh(&sess_idr_lock);
- idr_preload_end();
-
+ ret = idr_alloc(&sess_idr, NULL, GFP_KERNEL);
if (ret < 0) {
pr_err("idr_alloc() for sess_idr failed\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
@@ -305,6 +298,7 @@ static int iscsi_login_zero_tsih_s1(
return -ENOMEM;
}
+ sess->session_index = ret;
sess->creation_time = get_jiffies_64();
spin_lock_init(&sess->session_stats_lock);
/*
@@ -1312,9 +1306,7 @@ new_sess_out:
if (conn->sess->se_sess)
transport_free_session(conn->sess->se_sess);
if (conn->sess->session_index != 0) {
- spin_lock_bh(&sess_idr_lock);
idr_remove(&sess_idr, conn->sess->session_index);
- spin_unlock_bh(&sess_idr_lock);
}
kfree(conn->sess->sess_ops);
kfree(conn->sess);
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index e9ac882868c0..964779a11a80 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -622,7 +622,6 @@ struct cgroup_subsys {
struct list_head sibling;
/* used when use_id == true */
struct idr idr;
- spinlock_t id_lock;
/* list of cftype_sets */
struct list_head cftsets;
diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
index d8e37ecea691..5a1ad3d780ec 100644
--- a/include/net/sctp/sctp.h
+++ b/include/net/sctp/sctp.h
@@ -502,7 +502,6 @@ extern struct proto sctpv6_prot;
void sctp_put_port(struct sock *sk);
extern struct idr sctp_assocs_id;
-extern spinlock_t sctp_assocs_id_lock;
/* Static inline functions. */
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 5bf4f97ed1a4..b7d0be1f4492 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -5393,9 +5393,7 @@ void free_css_id(struct cgroup_subsys *ss, struct cgroup_subsys_state *css)
rcu_assign_pointer(id->css, NULL);
rcu_assign_pointer(css->id, NULL);
- spin_lock(&ss->id_lock);
idr_remove(&ss->idr, id->id);
- spin_unlock(&ss->id_lock);
kfree_rcu(id, rcu_head);
}
EXPORT_SYMBOL_GPL(free_css_id);
@@ -5417,12 +5415,8 @@ static struct css_id *get_new_cssid(struct cgroup_subsys *ss, int depth)
if (!newid)
return ERR_PTR(-ENOMEM);
- idr_preload(GFP_KERNEL);
- spin_lock(&ss->id_lock);
/* Don't use 0. allocates an ID of 1-65535 */
- ret = idr_alloc_range(&ss->idr, newid, 1, CSS_ID_MAX + 1, GFP_NOWAIT);
- spin_unlock(&ss->id_lock);
- idr_preload_end();
+ ret = idr_alloc_range(&ss->idr, newid, 1, CSS_ID_MAX + 1, GFP_KERNEL);
/* Returns error when there are no free spaces for new ID.*/
if (ret < 0)
@@ -5442,7 +5436,6 @@ static int __init_or_module cgroup_init_idr(struct cgroup_subsys *ss,
{
struct css_id *newid;
- spin_lock_init(&ss->id_lock);
idr_init(&ss->idr);
newid = get_new_cssid(ss, 0);
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index aeb41bf31a2e..b97303ab1fb3 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1703,13 +1703,7 @@ static struct worker *create_worker(struct worker_pool *pool)
* ID is needed to determine kthread name. Allocate ID first
* without installing the pointer.
*/
- idr_preload(GFP_KERNEL);
- spin_lock_irq(&pool->lock);
-
- id = idr_alloc(&pool->worker_idr, NULL, GFP_NOWAIT);
-
- spin_unlock_irq(&pool->lock);
- idr_preload_end();
+ id = idr_alloc(&pool->worker_idr, NULL, GFP_KERNEL);
if (id < 0)
goto fail;
@@ -1750,18 +1744,13 @@ static struct worker *create_worker(struct worker_pool *pool)
worker->flags |= WORKER_UNBOUND;
/* successful, commit the pointer to idr */
- spin_lock_irq(&pool->lock);
idr_replace(&pool->worker_idr, worker, worker->id);
- spin_unlock_irq(&pool->lock);
return worker;
fail:
- if (id >= 0) {
- spin_lock_irq(&pool->lock);
+ if (id >= 0)
idr_remove(&pool->worker_idr, id);
- spin_unlock_irq(&pool->lock);
- }
kfree(worker);
return NULL;
}
diff --git a/net/9p/util.c b/net/9p/util.c
index cc31c629b0ac..23693d69e648 100644
--- a/net/9p/util.c
+++ b/net/9p/util.c
@@ -41,7 +41,6 @@
*/
struct p9_idpool {
- spinlock_t lock;
struct idr pool;
};
@@ -58,7 +57,6 @@ struct p9_idpool *p9_idpool_create(void)
if (!p)
return ERR_PTR(-ENOMEM);
- spin_lock_init(&p->lock);
idr_init(&p->pool);
return p;
@@ -88,16 +86,9 @@ EXPORT_SYMBOL(p9_idpool_destroy);
int p9_idpool_get(struct p9_idpool *p)
{
int i;
- unsigned long flags;
-
- idr_preload(GFP_NOFS);
- spin_lock_irqsave(&p->lock, flags);
/* no need to store exactly p, we just need something non-null */
- i = idr_alloc(&p->pool, p, GFP_NOWAIT);
-
- spin_unlock_irqrestore(&p->lock, flags);
- idr_preload_end();
+ i = idr_alloc(&p->pool, p, GFP_NOFS);
if (i < 0)
return -1;
@@ -117,13 +108,9 @@ EXPORT_SYMBOL(p9_idpool_get);
void p9_idpool_put(int id, struct p9_idpool *p)
{
- unsigned long flags;
-
p9_debug(P9_DEBUG_MUX, " id %d pool %p\n", id, p);
- spin_lock_irqsave(&p->lock, flags);
idr_remove(&p->pool, id);
- spin_unlock_irqrestore(&p->lock, flags);
}
EXPORT_SYMBOL(p9_idpool_put);
diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index bce5b79662a6..d88fc6dd2326 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -464,11 +464,8 @@ static void sctp_association_destroy(struct sctp_association *asoc)
sctp_endpoint_put(asoc->ep);
sock_put(asoc->base.sk);
- if (asoc->assoc_id != 0) {
- spin_lock_bh(&sctp_assocs_id_lock);
+ if (asoc->assoc_id != 0)
idr_remove(&sctp_assocs_id, asoc->assoc_id);
- spin_unlock_bh(&sctp_assocs_id_lock);
- }
WARN_ON(atomic_read(&asoc->rmem_alloc));
@@ -1572,21 +1569,14 @@ int sctp_assoc_lookup_laddr(struct sctp_association *asoc,
/* Set an association id for a given association */
int sctp_assoc_set_id(struct sctp_association *asoc, gfp_t gfp)
{
- bool preload = gfp & __GFP_WAIT;
int ret;
/* If the id is already assigned, keep it. */
if (asoc->assoc_id)
return 0;
- if (preload)
- idr_preload(gfp);
- spin_lock_bh(&sctp_assocs_id_lock);
/* 0 is not a valid assoc_id, must be >= 1 */
- ret = idr_alloc_cyclic(&sctp_assocs_id, asoc, 1, 0, GFP_NOWAIT);
- spin_unlock_bh(&sctp_assocs_id_lock);
- if (preload)
- idr_preload_end();
+ ret = idr_alloc_cyclic(&sctp_assocs_id, asoc, 1, 0, gfp);
if (ret < 0)
return ret;
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index 4a17494d736c..7dc468a39423 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -71,7 +71,6 @@
struct sctp_globals sctp_globals __read_mostly;
struct idr sctp_assocs_id;
-DEFINE_SPINLOCK(sctp_assocs_id_lock);
static struct sctp_pf *sctp_pf_inet6_specific;
static struct sctp_pf *sctp_pf_inet_specific;
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index c6670d2e3f8d..eb681929e4d3 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -226,9 +226,7 @@ struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
if (!id || (id == (sctp_assoc_t)-1))
return NULL;
- spin_lock_bh(&sctp_assocs_id_lock);
asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
- spin_unlock_bh(&sctp_assocs_id_lock);
if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
return NULL;