[PATCH v2] maiblox: mediatek: Fix handling of platform_get_irq() error

* [PATCH v2] maiblox: mediatek: Fix handling of platform_get_irq() error
@ 2020-08-27  7:31 Krzysztof Kozlowski
  2020-08-27 13:57 ` Aw: " Frank Wunderlich
  0 siblings, 1 reply; 3+ messages in thread
From: Krzysztof Kozlowski @ 2020-08-27  7:31 UTC (permalink / raw)
  To: Jassi Brar, Matthias Brugger, HS Liao, Houlong Wei, CK Hu,
	linux-kernel, linux-arm-kernel, linux-mediatek
  Cc: Krzysztof Kozlowski

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@kernel.org>

---

Changes since v1:
1. Correct u32->int,
2. Fix left-over '!'.
---
 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 484d4438cd83..5665b6ea8119 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;
@@ -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


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