media: v4l2-core: fix compat VIDIOC_DQEVENT for time64 ABI

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The native code supports the variant of struct v4l2_event for 64-bit
time_t, so add the compat version as well.

Here, a new incompatibility arises: while almost all 32-bit architectures
now use the same layout as 64-bit architectures and the commands can
simply be passed through, on x86 the internal alignment of v4l2_event
is different because of the 64-bit member in v4l2_event_ctrl.

To handle all architectures, this now requires defining four different
versions of the structure to cover all possible combinations. The compat
handling for VIDIOC_DQEVENT32 and VIDIOC_DQEVENT32_TIME32 is now inside
of an #ifdef so it does not get used on architectures other than x86.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

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Arnd Bergmann 2019-12-16 15:15:05 +01:00 • committed by Mauro Carvalho Chehab

parent 577c89b0ce

commit 9983b2daf1

1 changed files with 59 additions and 1 deletions

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

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