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drm/vmwgfx: fix lock breakage

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commit d059f652e7
Author:     Daniel Vetter <daniel.vetter@ffwll.ch>
AuthorDate: Fri Jul 25 18:07:40 2014 +0200

    drm: Handle legacy per-crtc locking with full acquire ctx

drm_mode_cursor_common() was switched to use drm_modeset_(un)lock_crtc()
which uses full aquire ctx.  So dropping/reaquiring the lock via
drm_modeset_(un)lock() directly isn't the right thing to do, as lockdep
kindly points out.

The 'FIXME's about sorting out whether vmwgfx *really* needs to lock-all
for cursor updates still apply.

Signed-off-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>
Tested-by: Thomas Hellstrom <thellstrom@vmware.com>
This commit is contained in:
Rob Clark 2014-10-30 13:39:04 -04:00 committed by Thomas Hellstrom
parent d34d4d8af8
commit 21e88620aa
1 changed files with 4 additions and 4 deletions
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8
drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
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@ -187,7 +187,7 @@ int vmw_du_crtc_cursor_set(struct drm_crtc *crtc, struct drm_file *file_priv,
* can do this since the caller in the drm core doesn't check anything
* which is protected by any looks.
*/
drm_modeset_unlock(&crtc->mutex);
drm_modeset_unlock_crtc(crtc);
drm_modeset_lock_all(dev_priv->dev);
/* A lot of the code assumes this */
@ -252,7 +252,7 @@ int vmw_du_crtc_cursor_set(struct drm_crtc *crtc, struct drm_file *file_priv,
ret = 0;
out:
drm_modeset_unlock_all(dev_priv->dev);
drm_modeset_lock(&crtc->mutex, NULL);
drm_modeset_lock_crtc(crtc);
return ret;
}
@ -273,7 +273,7 @@ int vmw_du_crtc_cursor_move(struct drm_crtc *crtc, int x, int y)
* can do this since the caller in the drm core doesn't check anything
* which is protected by any looks.
*/
drm_modeset_unlock(&crtc->mutex);
drm_modeset_unlock_crtc(crtc);
drm_modeset_lock_all(dev_priv->dev);
vmw_cursor_update_position(dev_priv, shown,
@ -281,7 +281,7 @@ int vmw_du_crtc_cursor_move(struct drm_crtc *crtc, int x, int y)
du->cursor_y + du->hotspot_y);
drm_modeset_unlock_all(dev_priv->dev);
drm_modeset_lock(&crtc->mutex, NULL);
drm_modeset_lock_crtc(crtc);
return 0;
}