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drm: Only take crtc lock in get_gamma ioctl 

We don't call into drivers at all here, this is enough. Also, we can
reduce the critical section a bit to simplify the code.
crtc->gamma_size is set up once at driver load and then invariant, so
also doesn't need any protection.

Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170403083304.9083-8-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter 2017-04-03 10:32:56 +02:00
parent eb8eb02ed8
commit 04ee39ba9f
1 changed files with 6 additions and 10 deletions
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16
drivers/gpu/drm/drm_color_mgmt.c
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@ -295,19 +295,15 @@ int drm_mode_gamma_get_ioctl(struct drm_device *dev,
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return -EINVAL;
drm_modeset_lock_all(dev);
crtc = drm_crtc_find(dev, crtc_lut->crtc_id);
if (!crtc) {
ret = -ENOENT;
goto out;
}
if (!crtc)
return -ENOENT;
/* memcpy into gamma store */
if (crtc_lut->gamma_size != crtc->gamma_size) {
ret = -EINVAL;
goto out;
}
if (crtc_lut->gamma_size != crtc->gamma_size)
return -EINVAL;
drm_modeset_lock(&crtc->mutex, NULL);
size = crtc_lut->gamma_size * (sizeof(uint16_t));
r_base = crtc->gamma_store;
if (copy_to_user((void __user *)(unsigned long)crtc_lut->red, r_base, size)) {
@ -327,6 +323,6 @@ int drm_mode_gamma_get_ioctl(struct drm_device *dev,
goto out;
}
out:
drm_modeset_unlock_all(dev);
drm_modeset_unlock(&crtc->mutex);
return ret;
}