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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
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1 changed files with 0 additions and 2 deletions
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@ -1328,7 +1328,6 @@ int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd,
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goto unlock;
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}
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mutex_lock(&dev->mode_config.mutex);
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switch (cmd) {
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case FBIO_WAITFORVSYNC:
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/*
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@ -1368,7 +1367,6 @@ int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd,
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}
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unlock:
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mutex_unlock(&dev->mode_config.mutex);
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mutex_unlock(&fb_helper->lock);
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return ret;
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}
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