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| author | Arnd Bergmann <arnd@arndb.de> | 2020-10-30 17:55:22 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-11-16 10:31:05 +0100 |
| commit | 8dbcc3fa387c16abfc88a628cf528c439c91b332 (patch) | |
| tree | 2acd7a58b5ba3bacb891b6c4705352bfb09dd5c5 /kernel/kheaders.c | |
| parent | 3650b228f83adda7e5ee532e2b90429c03f7b9ec (diff) | |
media: v4l2: prepare compat-ioctl rework
The v4l2-compat-ioctl32() currently takes an extra round trip through user
space pointers when converting the data structure formats. In particular,
this involves using the compat_alloc_user_space() and copy_in_user()
helpers that often lead to worse compat handlers compared to using
in_compat_syscall() checks when copying the data.
The native implementation already gained a simpler method to deal with
the conversion for the time32 conversion. Hook into the same places to
provide a location for reading and writing user space data from inside
of the generic video_usercopy() helper.
Hans Verkuil rewrote the video_get_user() function here to simplify
the zeroing of the extra input fields and fixed a couple of bugs in
the original implementation.
[hverkuil: fix: CHECK: Please don't use multiple blank lines]
Co-developed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'kernel/kheaders.c')
0 files changed, 0 insertions, 0 deletions