[media] v4l2-compat-ioctl32: VIDIOC_S_EDID should return all fields on error

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Most ioctls do not have to write back the contents of the argument
if an error is returned. But VIDIOC_S_EDID is an exception together
with the EXT_CTRLS ioctls (already handled correctly).

Add this exception to v4l2-compat-ioctl32.

This fixes a compliance error when using compat32 and trying to
set a new EDID with more blocks than the hardware supports. In
that case the driver will return -E2BIG and set edid.blocks to the
actual maximum number of blocks. This field was never copied back
to userspace due to this bug.

Signed-off-by: Hans Verkuil <hansverk@cisco.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

...

This commit is contained in:

Hans Verkuil 2017-03-30 09:05:25 -03:00 • committed by Mauro Carvalho Chehab

parent 3369cde0af

commit ba7ed691dc

1 changed files with 4 additions and 1 deletions

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drivers/media/v4l2-core/v4l2-compat-ioctl32.c

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