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drm/vmwgfx: Fix a couple of lock dependency violations 

Experimental lockdep annotation added to the TTM lock has unveiled a
couple of lock dependency violations in the vmwgfx driver. In both
cases it turns out that the device_private::reservation_sem is not
needed so the offending code is moved out of that lock.

Cc: <stable@vger.kernel.org>
Acked-by: Sinclair Yeh <syeh@vmware.com>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
This commit is contained in:
Thomas Hellstrom 2015-03-09 01:56:21 -07:00
parent cd961bb9ee
commit 5151adb37a
2 changed files with 6 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
View File

@ -2780,13 +2780,11 @@ int vmw_execbuf_ioctl(struct drm_device *dev, void *data,
NULL, arg->command_size, arg->throttle_us,
(void __user *)(unsigned long)arg->fence_rep,
NULL);
ttm_read_unlock(&dev_priv->reservation_sem);
if (unlikely(ret != 0))
goto out_unlock;
return ret;
vmw_kms_cursor_post_execbuf(dev_priv);
out_unlock:
ttm_read_unlock(&dev_priv->reservation_sem);
return ret;
return 0;
}

14
drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
View File

@ -2033,23 +2033,17 @@ int vmw_kms_update_layout_ioctl(struct drm_device *dev, void *data,
int i;
struct drm_mode_config *mode_config = &dev->mode_config;
ret = ttm_read_lock(&dev_priv->reservation_sem, true);
if (unlikely(ret != 0))
return ret;
if (!arg->num_outputs) {
struct drm_vmw_rect def_rect = {0, 0, 800, 600};
vmw_du_update_layout(dev_priv, 1, &def_rect);
goto out_unlock;
return 0;
}
rects_size = arg->num_outputs * sizeof(struct drm_vmw_rect);
rects = kcalloc(arg->num_outputs, sizeof(struct drm_vmw_rect),
GFP_KERNEL);
if (unlikely(!rects)) {
ret = -ENOMEM;
goto out_unlock;
}
if (unlikely(!rects))
return -ENOMEM;
user_rects = (void __user *)(unsigned long)arg->rects;
ret = copy_from_user(rects, user_rects, rects_size);
@ -2074,7 +2068,5 @@ int vmw_kms_update_layout_ioctl(struct drm_device *dev, void *data,
out_free:
kfree(rects);
out_unlock:
ttm_read_unlock(&dev_priv->reservation_sem);
return ret;
}