[PATCH v3] mailbox: mediatek: Fix handling of platform_get_irq() error

[PATCH v3] mailbox: mediatek: Fix handling of platform_get_irq() error

[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 v2:
1. Fix subject.

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

Re: [PATCH v3] mailbox: mediatek: Fix handling of platform_get_irq() error

[Krzysztof Kozlowski]

On Thu, Aug 27, 2020 at 08:25:07PM +0200, Krzysztof Kozlowski wrote:
> 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 v2:
> 1. Fix subject.
> 
> 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(-)

Any comments here? This is a bugfix.

Best regards,
Krzysztof

Re: [PATCH v3] mailbox: mediatek: Fix handling of platform_get_irq() error

[Chun-Kuang Hu]

Krzysztof Kozlowski <krzk@kernel.org> 於 2020年8月28日 週五 上午2:25寫道：
>
> platform_get_irq() returns -ERRNO on error.  In such case casting to u32
> and comparing to 0 would pass the check.
>

Reviewed-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

> Fixes: 623a6143a845 ("mailbox: mediatek: Add Mediatek CMDQ driver")
> Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
>
> ---
>
> Changes since v2:
> 1. Fix subject.
>
> 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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