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[media] mem2mem_testdev: 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 2012-07-31 03:51:25 -03:00 committed by Mauro Carvalho Chehab
parent 7224679a31
commit f46940399b
1 changed files with 20 additions and 9 deletions
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29
drivers/media/video/mem2mem_testdev.c
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@ -891,10 +891,15 @@ static int m2mtest_open(struct file *file)
struct m2mtest_dev *dev = video_drvdata(file);
struct m2mtest_ctx *ctx = NULL;
struct v4l2_ctrl_handler *hdl;
int rc = 0;
if (mutex_lock_interruptible(&dev->dev_mutex))
return -ERESTARTSYS;
ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
if (!ctx)
return -ENOMEM;
if (!ctx) {
rc = -ENOMEM;
goto open_unlock;
}
v4l2_fh_init(&ctx->fh, video_devdata(file));
file->private_data = &ctx->fh;
@ -927,11 +932,11 @@ static int m2mtest_open(struct file *file)
ctx->m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, ctx, &queue_init);
if (IS_ERR(ctx->m2m_ctx)) {
int ret = PTR_ERR(ctx->m2m_ctx);
rc = PTR_ERR(ctx->m2m_ctx);
v4l2_ctrl_handler_free(hdl);
kfree(ctx);
return ret;
goto open_unlock;
}
v4l2_fh_add(&ctx->fh);
@ -939,6 +944,8 @@ static int m2mtest_open(struct file *file)
dprintk(dev, "Created instance %p, m2m_ctx: %p\n", ctx, ctx->m2m_ctx);
open_unlock:
mutex_unlock(&dev->dev_mutex);
return 0;
}
@ -952,7 +959,9 @@ static int m2mtest_release(struct file *file)
v4l2_fh_del(&ctx->fh);
v4l2_fh_exit(&ctx->fh);
v4l2_ctrl_handler_free(&ctx->hdl);
mutex_lock(&dev->dev_mutex);
v4l2_m2m_ctx_release(ctx->m2m_ctx);
mutex_unlock(&dev->dev_mutex);
kfree(ctx);
atomic_dec(&dev->num_inst);
@ -970,9 +979,15 @@ static unsigned int m2mtest_poll(struct file *file,
static int m2mtest_mmap(struct file *file, struct vm_area_struct *vma)
{
struct m2mtest_dev *dev = video_drvdata(file);
struct m2mtest_ctx *ctx = file2ctx(file);
int res;
return v4l2_m2m_mmap(file, ctx->m2m_ctx, vma);
if (mutex_lock_interruptible(&dev->dev_mutex))
return -ERESTARTSYS;
res = v4l2_m2m_mmap(file, ctx->m2m_ctx, vma);
mutex_unlock(&dev->dev_mutex);
return res;
}
static const struct v4l2_file_operations m2mtest_fops = {
@ -1027,10 +1042,6 @@ static int m2mtest_probe(struct platform_device *pdev)
}
*vfd = m2mtest_videodev;
/* 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);
vfd->lock = &dev->dev_mutex;
ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0);