From 73a110623e7b7592defea69f028cccae495d69a4 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Fri, 11 May 2018 05:32:24 -0400 Subject: media: v4l2-core: push taking ioctl mutex down to ioctl handler The ioctl serialization mutex (vdev->lock or q->lock for vb2 queues) was taken at the highest level in v4l2-dev.c. This prevents more fine-grained locking since at that level we cannot examine the ioctl arguments, we can only do that after video_usercopy is called. So push the locking down to __video_do_ioctl() and subdev_do_ioctl_lock(). This also allows us to make a few functions in v4l2-ioctl.c static and video_usercopy() is no longer exported. The locking scheme is not changed by this patch, just pushed down. Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/v4l2-core/v4l2-dev.c | 6 ------ 1 file changed, 6 deletions(-) (limited to 'drivers/media/v4l2-core/v4l2-dev.c') diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c index c4f4357e9ca4..4ffd7d60a901 100644 --- a/drivers/media/v4l2-core/v4l2-dev.c +++ b/drivers/media/v4l2-core/v4l2-dev.c @@ -360,14 +360,8 @@ static long v4l2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) int ret = -ENODEV; if (vdev->fops->unlocked_ioctl) { - struct mutex *lock = v4l2_ioctl_get_lock(vdev, cmd); - - if (lock && mutex_lock_interruptible(lock)) - return -ERESTARTSYS; if (video_is_registered(vdev)) ret = vdev->fops->unlocked_ioctl(filp, cmd, arg); - if (lock) - mutex_unlock(lock); } else ret = -ENOTTY; -- cgit v1.2.3