linux-kernel - [PATCH] maiblox: mediatek: Fix handling of platform_get

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Message-Id: <20200827072626.23331-1-krzk@kernel.org>
Date:   Thu, 27 Aug 2020 09:26:26 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Jassi Brar <jassisinghbrar@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Houlong Wei <houlong.wei@...iatek.com>,
        HS Liao <hs.liao@...iatek.com>, CK Hu <ck.hu@...iatek.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Cc:     Krzysztof Kozlowski <krzk@...nel.org>
Subject: [PATCH] maiblox: mediatek: Fix handling of platform_get_irq() error

platform_get_irq() returns -ERRNO on error.  In such case comparison
to 0 would pass the check.

Fixes: 623a6143a845 ("mailbox: mediatek: Add Mediatek CMDQ driver")
Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
---
 drivers/mailbox/mtk-cmdq-mailbox.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
index 484d4438cd83..76e4dfcf5228 100644
--- a/drivers/mailbox/mtk-cmdq-mailbox.c
+++ b/drivers/mailbox/mtk-cmdq-mailbox.c
@@ -525,10 +525,8 @@ 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;
 
 	plat_data = (struct gce_plat *)of_device_get_match_data(dev);
 	if (!plat_data) {
-- 
2.17.1