[PATCH 5.8 410/633] maiblox: mediatek: Fix handling of platform_get_irq() error

[Greg Kroah-Hartman]

From: Krzysztof Kozlowski <krzk@xxxxxxxxxx>

[ Upstream commit 558e4c36ec9f2722af4fe8ef84dc812bcdb5c43a ]

platform_get_irq() returns -ERRNO on error.  In such case casting to u32
and comparing to 0 would pass the check.

Fixes: 623a6143a845 ("mailbox: mediatek: Add Mediatek CMDQ driver")
Signed-off-by: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
Signed-off-by: Jassi Brar <jaswinder.singh@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/mailbox/mtk-cmdq-mailbox.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
index b24822ad8409c..9963bb9cd74fa 100644
--- a/drivers/mailbox/mtk-cmdq-mailbox.c
+++ b/drivers/mailbox/mtk-cmdq-mailbox.c
@@ -69,7 +69,7 @@ struct cmdq_task {
 struct cmdq {
 	struct mbox_controller	mbox;
 	void __iomem		*base;
-	u32			irq;
+	int			irq;
 	u32			thread_nr;
 	u32			irq_mask;
 	struct cmdq_thread	*thread;
@@ -466,10 +466,8 @@ static int cmdq_probe(struct platform_device *pdev)
 	}
 
 	cmdq->irq = platform_get_irq(pdev, 0);
-	if (!cmdq->irq) {
-		dev_err(dev, "failed to get irq\n");
-		return -EINVAL;
-	}
+	if (cmdq->irq < 0)
+		return cmdq->irq;
 
 	cmdq->thread_nr = (u32)(unsigned long)of_device_get_match_data(dev);
 	cmdq->irq_mask = GENMASK(cmdq->thread_nr - 1, 0);
-- 
2.25.1