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drm: check for minor master before allowing drop master. 

When fast user switching a lot eventually we get to the point,
where we were checking for the wrong thing in this function.

Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2009-04-20 09:32:50 +10:00
parent 6b0084266c
commit 07f1c7a7f6
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/drm_stub.c
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@ -185,6 +185,9 @@ int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
if (!file_priv->is_master)
return -EINVAL;
if (!file_priv->minor->master)
return -EINVAL;
mutex_lock(&dev->struct_mutex);
drm_master_put(&file_priv->minor->master);
file_priv->is_master = 0;