linux-kernel - [PATCH 3.5 11/78] drm/vmwgfx: Don't kill clients on VT switch

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Message-Id: <1385384825-21681-12-git-send-email-luis.henriques@canonical.com>
Date:	Mon, 25 Nov 2013 13:05:58 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Thomas Hellstrom <thellstrom@...are.com>,
	Dave Airlie <airlied@...hat.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.5 11/78] drm/vmwgfx: Don't kill clients on VT switch

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

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

From: Thomas Hellstrom <thellstrom@...are.com>

commit c4249855ac5b2a383704d31e040d3831d6a25c6f upstream.

DRI clients that tried to grab the TTM lock when the master (X server) was
switched away during a VT switch were sent the SIGTERM signal by the
kernel. Fix this so that they are only sent that signal when the master has
exited.

Signed-off-by: Thomas Hellstrom <thellstrom@...are.com>
Reviewed-by: Jakob Bornecrantz <jakob@...are.com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
[ luis: backported to 3.5:
  - adjusted context
  - vmw_execbuf_release_pinned_bo() takes 3 parameters ]
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index db50604..40cefd4 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -748,9 +748,17 @@ static void vmw_postclose(struct drm_device *dev,
 	struct vmw_fpriv *vmw_fp;
 
 	vmw_fp = vmw_fpriv(file_priv);
-	ttm_object_file_release(&vmw_fp->tfile);
-	if (vmw_fp->locked_master)
+
+	if (vmw_fp->locked_master) {
+		struct vmw_master *vmaster =
+			vmw_master(vmw_fp->locked_master);
+
+		ttm_lock_set_kill(&vmaster->lock, true, SIGTERM);
+		ttm_vt_unlock(&vmaster->lock);
 		drm_master_put(&vmw_fp->locked_master);
+	}
+
+	ttm_object_file_release(&vmw_fp->tfile);
 	kfree(vmw_fp);
 }
 
@@ -953,14 +961,13 @@ static void vmw_master_drop(struct drm_device *dev,
 
 	vmw_fp->locked_master = drm_master_get(file_priv->master);
 	ret = ttm_vt_lock(&vmaster->lock, false, vmw_fp->tfile);
-	vmw_execbuf_release_pinned_bo(dev_priv, false, 0);
-
 	if (unlikely((ret != 0))) {
 		DRM_ERROR("Unable to lock TTM at VT switch.\n");
 		drm_master_put(&vmw_fp->locked_master);
 	}
 
-	ttm_lock_set_kill(&vmaster->lock, true, SIGTERM);
+	ttm_lock_set_kill(&vmaster->lock, false, SIGTERM);
+	vmw_execbuf_release_pinned_bo(dev_priv, false, 0);
 
 	if (!dev_priv->enable_fb) {
 		ret = ttm_bo_evict_mm(&dev_priv->bdev, TTM_PL_VRAM);
-- 
1.8.3.2

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