[PATCH 3.12 056/123] drm: Reject DRI1 hw lock ioctl functions for kms drivers

From: Jiri Slaby
Date: Wed Oct 28 2015 - 10:21:56 EST

From: Daniel Vetter <daniel.vetter@xxxxxxxx>

3.12-stable review patch. If anyone has any objections, please let me know.


commit da168d81b44898404d281d5dbe70154ab5f117c1 upstream.

I've done some extensive history digging across libdrm, mesa and
xf86-video-{intel,nouveau,ati}. The only potential user of this with
kms drivers I could find was ttmtest, which once used drmGetLock
still. But that mistake was quickly fixed up. Even the intel xvmc
library (which otherwise was really good with using dri1 stuff in kms
mode) managed to never take the hw lock for dri2 (and hence kms).

Hence it should be save to unconditionally disallow this.

Cc: Peter Antoine <peter.antoine@xxxxxxxxx>
Reviewed-by: Peter Antoine <peter.antoine@xxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
drivers/gpu/drm/drm_lock.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/drm_lock.c b/drivers/gpu/drm/drm_lock.c
index d752c96d6090..bdceb60998d3 100644
--- a/drivers/gpu/drm/drm_lock.c
+++ b/drivers/gpu/drm/drm_lock.c
@@ -58,6 +58,9 @@ int drm_lock(struct drm_device *dev, void *data, struct drm_file *file_priv)
struct drm_master *master = file_priv->master;
int ret = 0;

+ if (drm_core_check_feature(dev, DRIVER_MODESET))
+ return -EINVAL;

if (lock->context == DRM_KERNEL_CONTEXT) {
@@ -151,6 +154,9 @@ int drm_unlock(struct drm_device *dev, void *data, struct drm_file *file_priv)
struct drm_lock *lock = data;
struct drm_master *master = file_priv->master;

+ if (drm_core_check_feature(dev, DRIVER_MODESET))
+ return -EINVAL;
if (lock->context == DRM_KERNEL_CONTEXT) {
DRM_ERROR("Process %d using kernel context %d\n",
task_pid_nr(current), lock->context);

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