tree 024886e8a84ab3f7e88c1e2c5aeceae28cc344bb
parent 2877842de8cbf6272b0a851cb12587b7dd8c2afb
author Hans Verkuil <hverkuil@xs4all.nl> 1290764848 -0300
committer Mauro Carvalho Chehab <mchehab@redhat.com> 1291241419 -0200

[media] V4L: improve the BKL replacement heuristic

The BKL replacement mutex had some serious performance side-effects on
V4L drivers. It is replaced by a better heuristic that works around the
worst of the side-effects.

Read the v4l2-dev.c comments for the whole sorry story. This is a
temporary measure only until we can convert all v4l drivers to use
unlocked_ioctl.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>