linux-kernel - [PATCH 3.16.y-ckt 37/94] drm: Reject DRI1 hw lock ioctl functions for kms drivers

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Message-Id: <1447409428-12178-38-git-send-email-luis.henriques@canonical.com>
Date:	Fri, 13 Nov 2015 10:09:31 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Peter Antoine <peter.antoine@...el.com>,
	Daniel Vetter <daniel.vetter@...el.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 37/94] drm: Reject DRI1 hw lock ioctl functions for kms drivers

3.16.7-ckt20 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Daniel Vetter <daniel.vetter@...ll.ch>

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@...el.com>
Reviewed-by: Peter Antoine <peter.antoine@...el.com>
Signed-off-by: Daniel Vetter <daniel.vetter@...el.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 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 f6452682141b..8b8b0e3fc2a8 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;
+
 	++file_priv->lock_count;
 
 	if (lock->context == DRM_KERNEL_CONTEXT) {
@@ -150,6 +153,9 @@ 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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