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[media] bfin_capture: remove V4L2_FL_LOCK_ALL_FOPS

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Add proper locking to the file operations, allowing for the removal
of the V4L2_FL_LOCK_ALL_FOPS flag.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil 2012-06-24 06:36:49 -03:00 committed by Mauro Carvalho Chehab
parent f135a8a224
commit 28c3682ac5
1 changed files with 11 additions and 6 deletions
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17
drivers/media/video/blackfin/bfin_capture.c
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@ -235,8 +235,13 @@ static int bcap_release(struct file *file)
static int bcap_mmap(struct file *file, struct vm_area_struct *vma)
{
struct bcap_device *bcap_dev = video_drvdata(file);
int ret;
return vb2_mmap(&bcap_dev->buffer_queue, vma);
if (mutex_lock_interruptible(&bcap_dev->mutex))
return -ERESTARTSYS;
ret = vb2_mmap(&bcap_dev->buffer_queue, vma);
mutex_unlock(&bcap_dev->mutex);
return ret;
}
#ifndef CONFIG_MMU
@ -259,8 +264,12 @@ static unsigned long bcap_get_unmapped_area(struct file *file,
static unsigned int bcap_poll(struct file *file, poll_table *wait)
{
struct bcap_device *bcap_dev = video_drvdata(file);
unsigned int res;
return vb2_poll(&bcap_dev->buffer_queue, file, wait);
mutex_lock(&bcap_dev->mutex);
res = vb2_poll(&bcap_dev->buffer_queue, file, wait);
mutex_unlock(&bcap_dev->mutex);
return res;
}
static int bcap_queue_setup(struct vb2_queue *vq,
@ -942,10 +951,6 @@ static int __devinit bcap_probe(struct platform_device *pdev)
INIT_LIST_HEAD(&bcap_dev->dma_queue);
vfd->lock = &bcap_dev->mutex;
/* Locking in file operations other than ioctl should be done
by the driver, not the V4L2 core.
This driver needs auditing so that this flag can be removed. */
set_bit(V4L2_FL_LOCK_ALL_FOPS, &vfd->flags);
/* register video device */
ret = video_register_device(bcap_dev->video_dev, VFL_TYPE_GRABBER, -1);