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authorThomas Hellstrom <thellstrom@vmware.com>2009-03-02 05:10:56 -0500
committerDave Airlie <airlied@linux.ie>2009-03-02 18:50:20 -0500
commitfda714c29cdf360464059044b221450decb4b913 (patch)
treedc985f3c861d9490a1b5ffe82583497b6fe64236 /drivers/gpu/drm/drm_stub.c
parent171901d15deeef61aa8e1b0d0772404f39691b73 (diff)
drm: Avoid client deadlocks when the master disappears.
This is done by 1) Wake up lock waiters when we close the master file descriptor. Not when the master structure is removed, since the latter requires the waiters themselves to release the refcount on the master structure -> Deadlock. 2) Send a SIGTERM to all clients waiting for the lock. Normally these clients will get a SIGPIPE when the X server dies, but clients may also spin trying to grab the DRM lock, without getting any sort of notification. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Dave Airlie <airlied@linux.ie>
Diffstat (limited to 'drivers/gpu/drm/drm_stub.c')
-rw-r--r--drivers/gpu/drm/drm_stub.c8
1 files changed, 0 insertions, 8 deletions
diff --git a/drivers/gpu/drm/drm_stub.c b/drivers/gpu/drm/drm_stub.c
index 7b251dd70811..096e2a37446d 100644
--- a/drivers/gpu/drm/drm_stub.c
+++ b/drivers/gpu/drm/drm_stub.c
@@ -146,14 +146,6 @@ static void drm_master_destroy(struct kref *kref)
146 146
147 drm_ht_remove(&master->magiclist); 147 drm_ht_remove(&master->magiclist);
148 148
149 if (master->lock.hw_lock) {
150 if (dev->sigdata.lock == master->lock.hw_lock)
151 dev->sigdata.lock = NULL;
152 master->lock.hw_lock = NULL;
153 master->lock.file_priv = NULL;
154 wake_up_interruptible_all(&master->lock.lock_queue);
155 }
156
157 drm_free(master, sizeof(*master), DRM_MEM_DRIVER); 149 drm_free(master, sizeof(*master), DRM_MEM_DRIVER);
158} 150}
159 151