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drm/atmel-hlcdc: 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.

Atmel tracks pending commits through dc->commit.pending, so it can
ignore the changes by setting stall = false. We never return failure in
this case, so make failure a BUG_ON.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Boris Brezillon <boris.brezillon@free-electrons.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170711143314.2148-5-maarten.lankhorst@linux.intel.com
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Maarten Lankhorst 2017-07-11 16:33:06 +02:00 committed by Daniel Vetter
parent 8572636e45
commit f4d41d930e
1 changed files with 7 additions and 6 deletions
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13
drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
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@ -539,14 +539,13 @@ static int atmel_hlcdc_dc_atomic_commit(struct drm_device *dev,
dc->commit.pending = true;
spin_unlock(&dc->commit.wait.lock);
if (ret) {
kfree(commit);
goto error;
}
if (ret)
goto err_free;
/* Swap the state, this is the point of no return. */
drm_atomic_helper_swap_state(state, true);
/* We have our own synchronization through the commit lock. */
BUG_ON(drm_atomic_helper_swap_state(state, false) < 0);
/* Swap state succeeded, this is the point of no return. */
drm_atomic_state_get(state);
if (async)
queue_work(dc->wq, &commit->work);
@ -555,6 +554,8 @@ static int atmel_hlcdc_dc_atomic_commit(struct drm_device *dev,
return 0;
err_free:
kfree(commit);
error:
drm_atomic_helper_cleanup_planes(dev, state);
return ret;