On 1/14/22 12:18 AM, Miaoqian Lin wrote:
> platform_get_irq() returns negative error number instead 0 on failure.
the 'instead of' wording is a bit misleading:
platform_get_irq() returns non-zero IRQ number on success, negative
error number on failure. Zero is not a valid return valid.
> 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: ad7fcbc308b0 ("slimbus: qcom: Add Qualcomm Slimbus controller driver")
> Signed-off-by: Miaoqian Lin <linmq006@xxxxxxxxx>
> ---
> drivers/slimbus/qcom-ctrl.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/slimbus/qcom-ctrl.c b/drivers/slimbus/qcom-ctrl.c
> index f04b961b96cd..ec58091fc948 100644
> --- a/drivers/slimbus/qcom-ctrl.c
> +++ b/drivers/slimbus/qcom-ctrl.c
> @@ -510,9 +510,9 @@ static int qcom_slim_probe(struct platform_device *pdev)
> }
>
> ctrl->irq = platform_get_irq(pdev, 0);
> - if (!ctrl->irq) {
> + if (ctrl->irq < 0) {
> dev_err(&pdev->dev, "no slimbus IRQ\n");
> - return -ENODEV;
> + return ctrl->irq;
> }
>
> sctrl = &ctrl->ctrl;
>
