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[media] videobuf2: Fix CodingStyle

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Changeset b18a8ff29d added a comment violating the 80cols max size,
with no good reason.

Fix it.

Cc: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Mauro Carvalho Chehab 2014-01-07 07:03:09 -02:00
parent b18a8ff29d
commit f103b5d64e
1 changed files with 10 additions and 9 deletions
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19
drivers/media/v4l2-core/videobuf2-core.c
View file

@ -1246,15 +1246,16 @@ static int __buf_prepare(struct vb2_buffer *vb, const struct v4l2_buffer *b)
break;
case V4L2_MEMORY_USERPTR:
/*
* In case of user pointer buffers vb2 allocators need to get direct
* access to userspace pages. This requires getting the mmap semaphore
* for read access in the current process structure. The same semaphore
* is taken before calling mmap operation, while both qbuf/prepare_buf
* and mmap are called by the driver or v4l2 core with the driver's lock
* held. To avoid an AB-BA deadlock (mmap_sem then driver's lock in mmap
* and driver's lock then mmap_sem in qbuf/prepare_buf) the videobuf2
* core releases the driver's lock, takes mmap_sem and then takes the
* driver's lock again.
* In case of user pointer buffers vb2 allocators need to get
* direct access to userspace pages. This requires getting
* the mmap semaphore for read access in the current process
* structure. The same semaphore is taken before calling mmap
* operation, while both qbuf/prepare_buf and mmap are called
* by the driver or v4l2 core with the driver's lock held.
* To avoid an AB-BA deadlock (mmap_sem then driver's lock in
* mmap and driver's lock then mmap_sem in qbuf/prepare_buf),
* the videobuf2 core releases the driver's lock, takes
* mmap_sem and then takes the driver's lock again.
*/
mmap_sem = &current->mm->mmap_sem;
call_qop(q, wait_prepare, q);