media: v4l2-mem2mem: add lock to protect parameter num_rdy
authorYunfei Dong <yunfei.dong@mediatek.com>
Mon, 17 Apr 2023 08:17:40 +0000 (16:17 +0800)
committerHans Verkuil <hverkuil-cisco@xs4all.nl>
Thu, 25 May 2023 14:21:20 +0000 (16:21 +0200)
commit56b5c3e67b0f9af3f45cf393be048ee8d8a92694
treef7d91205e61d174aca0d0cffb4f7f8a317c2889e
parentf0b4a2c037c0ab1affdf0937aee84314ab9c4fee
media: v4l2-mem2mem: add lock to protect parameter num_rdy

Getting below error when using KCSAN to check the driver. Adding lock to
protect parameter num_rdy when getting the value with function:
v4l2_m2m_num_src_bufs_ready/v4l2_m2m_num_dst_bufs_ready.

kworker/u16:3: [name:report&]BUG: KCSAN: data-race in v4l2_m2m_buf_queue
kworker/u16:3: [name:report&]

kworker/u16:3: [name:report&]read-write to 0xffffff8105f35b94 of 1 bytes by task 20865 on cpu 7:
kworker/u16:3:  v4l2_m2m_buf_queue+0xd8/0x10c

Signed-off-by: Pina Chen <pina.chen@mediatek.com>
Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
include/media/v4l2-mem2mem.h