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authorHans Verkuil <hans.verkuil@cisco.com>2013-02-04 09:27:32 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2013-03-05 14:43:10 -0300
commitf80daa2d7d7725559908909254d240c433cafc93 (patch)
treed6578d944aa7ed763b3c4073f3539c674cd5b68f /drivers/media/usb/stkwebcam
parent8407653f5e2b9805958e0a392c0411ce027a3934 (diff)
[media] stk-webcam: enable core-locking
This makes it possible to switch to unlocked_ioctl. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Tested-by: Arvydas Sidorenko <asido4@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/usb/stkwebcam')
-rw-r--r--drivers/media/usb/stkwebcam/stk-webcam.c24
-rw-r--r--drivers/media/usb/stkwebcam/stk-webcam.h1
2 files changed, 23 insertions, 2 deletions
diff --git a/drivers/media/usb/stkwebcam/stk-webcam.c b/drivers/media/usb/stkwebcam/stk-webcam.c
index bb524574c838..2f1a09db1135 100644
--- a/drivers/media/usb/stkwebcam/stk-webcam.c
+++ b/drivers/media/usb/stkwebcam/stk-webcam.c
@@ -610,6 +610,8 @@ static int v4l_stk_open(struct file *fp)
if (dev == NULL || !is_present(dev))
return -ENXIO;
+ if (mutex_lock_interruptible(&dev->lock))
+ return -ERESTARTSYS;
if (!dev->first_init)
stk_camera_write_reg(dev, 0x0, 0x24);
else
@@ -618,6 +620,7 @@ static int v4l_stk_open(struct file *fp)
err = v4l2_fh_open(fp);
if (!err)
usb_autopm_get_interface(dev->interface);
+ mutex_unlock(&dev->lock);
return err;
}
@@ -625,6 +628,7 @@ static int v4l_stk_release(struct file *fp)
{
struct stk_camera *dev = video_drvdata(fp);
+ mutex_lock(&dev->lock);
if (dev->owner == fp) {
stk_stop_stream(dev);
stk_free_buffers(dev);
@@ -635,10 +639,11 @@ static int v4l_stk_release(struct file *fp)
if (is_present(dev))
usb_autopm_put_interface(dev->interface);
+ mutex_unlock(&dev->lock);
return v4l2_fh_release(fp);
}
-static ssize_t v4l_stk_read(struct file *fp, char __user *buf,
+static ssize_t stk_read(struct file *fp, char __user *buf,
size_t count, loff_t *f_pos)
{
int i;
@@ -699,6 +704,19 @@ static ssize_t v4l_stk_read(struct file *fp, char __user *buf,
return count;
}
+static ssize_t v4l_stk_read(struct file *fp, char __user *buf,
+ size_t count, loff_t *f_pos)
+{
+ struct stk_camera *dev = video_drvdata(fp);
+ int ret;
+
+ if (mutex_lock_interruptible(&dev->lock))
+ return -ERESTARTSYS;
+ ret = stk_read(fp, buf, count, f_pos);
+ mutex_unlock(&dev->lock);
+ return ret;
+}
+
static unsigned int v4l_stk_poll(struct file *fp, poll_table *wait)
{
struct stk_camera *dev = video_drvdata(fp);
@@ -1183,7 +1201,7 @@ static struct v4l2_file_operations v4l_stk_fops = {
.read = v4l_stk_read,
.poll = v4l_stk_poll,
.mmap = v4l_stk_mmap,
- .ioctl = video_ioctl2,
+ .unlocked_ioctl = video_ioctl2,
};
static const struct v4l2_ioctl_ops v4l_stk_ioctl_ops = {
@@ -1231,6 +1249,7 @@ static int stk_register_video_device(struct stk_camera *dev)
int err;
dev->vdev = stk_v4l_data;
+ dev->vdev.lock = &dev->lock;
dev->vdev.debug = debug;
dev->vdev.v4l2_dev = &dev->v4l2_dev;
set_bit(V4L2_FL_USE_FH_PRIO, &dev->vdev.flags);
@@ -1286,6 +1305,7 @@ static int stk_camera_probe(struct usb_interface *interface,
dev->v4l2_dev.ctrl_handler = hdl;
spin_lock_init(&dev->spinlock);
+ mutex_init(&dev->lock);
init_waitqueue_head(&dev->wait_frame);
dev->first_init = 1; /* webcam LED management */
diff --git a/drivers/media/usb/stkwebcam/stk-webcam.h b/drivers/media/usb/stkwebcam/stk-webcam.h
index 2156320487d8..03550cf60dcd 100644
--- a/drivers/media/usb/stkwebcam/stk-webcam.h
+++ b/drivers/media/usb/stkwebcam/stk-webcam.h
@@ -99,6 +99,7 @@ struct stk_camera {
struct usb_interface *interface;
int webcam_model;
struct file *owner;
+ struct mutex lock;
int first_init;
u8 isoc_ep;