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drm/msm: Handle drm_atomic_helper_swap_state failure

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drm_atomic_helper_swap_state() will be changed to interruptible waiting
in the next few commits, so all drivers have to be changed to handling
failure.

MSM has its own busy tracking, which means the swap_state call can be
done with stall = false, in which case it should never return an error.
Handle failure with BUG_ON for this reason.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Rob Clark <robdclark@gmail.com>
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Link: http://patchwork.freedesktop.org/patch/msgid/20170711143314.2148-8-maarten.lankhorst@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Tested-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Maarten Lankhorst 2017-07-11 16:33:09 +02:00 committed by Daniel Vetter
parent 76cc07189d
commit 771f14c5cc
1 changed files with 8 additions and 8 deletions
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16
drivers/gpu/drm/msm/msm_atomic.c
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@ -232,20 +232,18 @@ int msm_atomic_commit(struct drm_device *dev,
* mark our set of crtc's as busy:
*/
ret = start_atomic(dev->dev_private, c->crtc_mask);
if (ret) {
kfree(c);
goto error;
}
if (ret)
goto err_free;
BUG_ON(drm_atomic_helper_swap_state(state, false) < 0);
/*
* This is the point of no return - everything below never fails except
* when the hw goes bonghits. Which means we can commit the new state on
* the software side now.
*
* swap driver private state while still holding state_lock
*/
drm_atomic_helper_swap_state(state, true);
/* swap driver private state while still holding state_lock */
if (to_kms_state(state)->state)
priv->kms->funcs->swap_state(priv->kms, state);
@ -275,6 +273,8 @@ int msm_atomic_commit(struct drm_device *dev,
return 0;
err_free:
kfree(c);
error:
drm_atomic_helper_cleanup_planes(dev, state);
return ret;