Message ID | 1492941665-17155-1-git-send-email-bianpan201602@163.com |
---|---|
State | Rejected, archived |
Delegated to: | David Miller |
Headers | show |
From: Pan Bian <bianpan201602@163.com> Date: Sun, 23 Apr 2017 18:01:05 +0800 > From: Pan Bian <bianpan2016@163.com> > > Function platform_get_irq() will return a negative value on errors. > However, in function bcmgenet_probe(), 0 is considered as a flag of > error. This patch fixes the bug by checking whether the return value of > platform_get_irq() is less than 0. > > Signed-off-by: Pan Bian <bianpan2016@163.com> I'm definitely not confident enough to apply this. On some platform zero IRQs are invalid. There are also lots of pieces of code that check the return value "> 0" as success.
On 04/24/2017 12:48 PM, David Miller wrote: > From: Pan Bian <bianpan201602@163.com> > Date: Sun, 23 Apr 2017 18:01:05 +0800 > >> From: Pan Bian <bianpan2016@163.com> >> >> Function platform_get_irq() will return a negative value on errors. >> However, in function bcmgenet_probe(), 0 is considered as a flag of >> error. This patch fixes the bug by checking whether the return value of >> platform_get_irq() is less than 0. >> >> Signed-off-by: Pan Bian <bianpan2016@163.com> > > I'm definitely not confident enough to apply this. > > On some platform zero IRQs are invalid. > > There are also lots of pieces of code that check the return value "> > 0" as success. > I don't think we are fixing any real issue by applying this patch, but I will do a check on ARM, ARM64 and MIPS where this driver is used to see if it is even remotely possible to have a 0 IRQ.
diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c index 365895e..0bccf2b 100644 --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c @@ -3329,7 +3329,7 @@ static int bcmgenet_probe(struct platform_device *pdev) priv->irq0 = platform_get_irq(pdev, 0); priv->irq1 = platform_get_irq(pdev, 1); priv->wol_irq = platform_get_irq(pdev, 2); - if (!priv->irq0 || !priv->irq1) { + if (priv->irq0 < 0 || priv->irq1 < 0) { dev_err(&pdev->dev, "can't find IRQs\n"); err = -EINVAL; goto err;