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| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2017-07-04 17:18:25 +0200 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2017-07-06 10:01:19 +0200 |
| commit | 235d3e4fa115b39a72112f29ec5c84b847111edd (patch) | |
| tree | 42d254be795add7c8c5af2e91f75f687c8bdb145 /drivers/gpu/drm/drm_fb_helper.c | |
| parent | bdac4a052a47920eeae22441ab608612dc0ef4e5 (diff) | |
| download | linux-stable-235d3e4fa115b39a72112f29ec5c84b847111edd.tar.gz linux-stable-235d3e4fa115b39a72112f29ec5c84b847111edd.tar.bz2 linux-stable-235d3e4fa115b39a72112f29ec5c84b847111edd.zip | |
drm/fb-helper: Drop locking from the vsync wait ioctl code
Like with the drm-native vblank wait ioctl we can entirely rely on the
spinlocks in drm_vblank.c, no need at all to take expensive mutexes.
The only reason we had to take mode_config.mutex was to protect the
fbdev helper's data-structures, but that's now done by
fb_helper->lock.
Cc: John Stultz <john.stultz@linaro.org>
Cc: Thierry Reding <treding@nvidia.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170704151833.17304-6-daniel.vetter@ffwll.ch
Diffstat (limited to 'drivers/gpu/drm/drm_fb_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_fb_helper.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 08a5e0d23a42..9efb17c3cbe8 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -1328,7 +1328,6 @@ int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd, goto unlock; } - mutex_lock(&dev->mode_config.mutex); switch (cmd) { case FBIO_WAITFORVSYNC: /* @@ -1368,7 +1367,6 @@ int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd, } unlock: - mutex_unlock(&dev->mode_config.mutex); mutex_unlock(&fb_helper->lock); return ret; } |