[PATCH] mailbox: mtk-cmdq: Fix pm_runtime_get_sync() warning in mbox shutdown

[Jason-JH.Lin <jason-jh.lin@mediatek.com>]

The return value of pm_runtime_get_sync() in cmdq_mbox_shutdown()
will return 1 when pm runtime state is active, and we don't want to
get the warning message in this case.

So we change the return value < 0 for WARN_ON().

Fixes: 8afe816b0c99 ("mailbox: mtk-cmdq-mailbox: Implement Runtime PM with autosuspend")
Signed-off-by: Jason-JH.Lin <jason-jh.lin@mediatek.com>
---
 drivers/mailbox/mtk-cmdq-mailbox.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
index ead2200f39ba..033aff11f87c 100644
--- a/drivers/mailbox/mtk-cmdq-mailbox.c
+++ b/drivers/mailbox/mtk-cmdq-mailbox.c
@@ -465,7 +465,7 @@ static void cmdq_mbox_shutdown(struct mbox_chan *chan)
 	struct cmdq_task *task, *tmp;
 	unsigned long flags;
 
-	WARN_ON(pm_runtime_get_sync(cmdq->mbox.dev));
+	WARN_ON(pm_runtime_get_sync(cmdq->mbox.dev) < 0);
 
 	spin_lock_irqsave(&thread->chan->lock, flags);
 	if (list_empty(&thread->task_busy_list))
-- 
2.18.0