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authorKeith Busch <keith.busch@intel.com>2015-11-26 12:21:29 +0100
committerJens Axboe <axboe@fb.com>2015-12-22 09:38:32 -0700
commit77bf25ea70200cddf083f74b7f617e5f07fac8bd (patch)
tree91de4674f021f95780fe9d924de22108161b5c70 /drivers/nvme/host
parent7385014c073263b077442439299fad013edd4409 (diff)
nvme: protect against simultaneous shutdown invocations
Signed-off-by: Keith Busch <keith.busch@intel.com> [hch: split from a larger patch] Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/nvme/host')
-rw-r--r--drivers/nvme/host/pci.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index d82f08d671e6..ad6d5cce42d5 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -31,6 +31,7 @@
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
+#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/poison.h>
#include <linux/ptrace.h>
@@ -113,6 +114,7 @@ struct nvme_dev {
struct work_struct reset_work;
struct work_struct probe_work;
struct work_struct scan_work;
+ struct mutex shutdown_lock;
bool subsystem;
void __iomem *cmb;
dma_addr_t cmb_dma_addr;
@@ -2073,6 +2075,7 @@ static void nvme_dev_shutdown(struct nvme_dev *dev)
nvme_dev_list_remove(dev);
+ mutex_lock(&dev->shutdown_lock);
if (dev->bar) {
nvme_freeze_queues(dev);
csts = readl(dev->bar + NVME_REG_CSTS);
@@ -2091,6 +2094,7 @@ static void nvme_dev_shutdown(struct nvme_dev *dev)
for (i = dev->queue_count - 1; i >= 0; i--)
nvme_clear_queue(dev->queues[i]);
+ mutex_unlock(&dev->shutdown_lock);
}
static int nvme_setup_prp_pools(struct nvme_dev *dev)
@@ -2333,6 +2337,7 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
INIT_WORK(&dev->scan_work, nvme_dev_scan);
INIT_WORK(&dev->probe_work, nvme_probe_work);
INIT_WORK(&dev->reset_work, nvme_reset_work);
+ mutex_init(&dev->shutdown_lock);
result = nvme_setup_prp_pools(dev);
if (result)