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@xxxxxxxxxx>
Cc: Thierry Reding <treding@xxxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
---
drivers/gpu/drm/drm_fb_helper.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 14b3f885a01f..13330c22e6bf 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -1342,7 +1342,6 @@ 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:
/*
@@ -1382,7 +1381,6 @@ 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;
}
--
2.13.2
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