platform_get_irq() returns negative error number instead 0 on failure.
And the doc of platform_get_irq() provides a usage example:

    int irq = platform_get_irq(pdev, 0);
    if (irq < 0)
        return irq;

Fix the check of return value to catch errors correctly.

Fixes: cdd5de500b2c ("soc: ti: Add wkup_m3_ipc driver")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
---
 drivers/soc/ti/wkup_m3_ipc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/soc/ti/wkup_m3_ipc.c b/drivers/soc/ti/wkup_m3_ipc.c
index 72386bd393fe..2f03ced0f411 100644
--- a/drivers/soc/ti/wkup_m3_ipc.c
+++ b/drivers/soc/ti/wkup_m3_ipc.c
@@ -450,9 +450,9 @@ static int wkup_m3_ipc_probe(struct platform_device *pdev)
 		return PTR_ERR(m3_ipc->ipc_mem_base);
 
 	irq = platform_get_irq(pdev, 0);
-	if (!irq) {
+	if (irq < 0) {
 		dev_err(&pdev->dev, "no irq resource\n");
-		return -ENXIO;
+		return irq;
 	}
 
 	ret = devm_request_irq(dev, irq, wkup_m3_txev_handler,
-- 
2.17.1

Hi,
On 1/14/22 00:28, Miaoqian Lin wrote:
> platform_get_irq() returns negative error number instead 0 on failure.
> And the doc of platform_get_irq() provides a usage example:
> 
>     int irq = platform_get_irq(pdev, 0);
>     if (irq < 0)
>         return irq;
> 
> Fix the check of return value to catch errors correctly.
> 

Looks good to me.

Acked-by: Dave Gerlach <d-gerlach@ti.com>

> Fixes: cdd5de500b2c ("soc: ti: Add wkup_m3_ipc driver")
> Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
> ---
>  drivers/soc/ti/wkup_m3_ipc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/soc/ti/wkup_m3_ipc.c b/drivers/soc/ti/wkup_m3_ipc.c
> index 72386bd393fe..2f03ced0f411 100644
> --- a/drivers/soc/ti/wkup_m3_ipc.c
> +++ b/drivers/soc/ti/wkup_m3_ipc.c
> @@ -450,9 +450,9 @@ static int wkup_m3_ipc_probe(struct platform_device *pdev)
>  		return PTR_ERR(m3_ipc->ipc_mem_base);
>  
>  	irq = platform_get_irq(pdev, 0);
> -	if (!irq) {
> +	if (irq < 0) {
>  		dev_err(&pdev->dev, "no irq resource\n");
> -		return -ENXIO;
> +		return irq;
>  	}
>  
>  	ret = devm_request_irq(dev, irq, wkup_m3_txev_handler,

Hi Miaoqian Lin,

On Fri, 14 Jan 2022 06:28:40 +0000, Miaoqian Lin wrote:
> platform_get_irq() returns negative error number instead 0 on failure.
> And the doc of platform_get_irq() provides a usage example:
> 
>     int irq = platform_get_irq(pdev, 0);
>     if (irq < 0)
>         return irq;
> 
> [...]

I have applied the following to branch ti-drivers-soc-next on [1].
Thank you!

[1/1] soc: ti: wkup_m3_ipc: Fix IRQ check in wkup_m3_ipc_probe
      commit: c3d66a164c726cc3b072232d3b6d87575d194084

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent up the chain during
the next merge window (or sooner if it is a relevant bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

[1] git://git.kernel.org/pub/scm/linux/kernel/git/ti/linux.git
-- 
Regards,
Nishanth Menon
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