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Date: Mon, 7 Sep 2015 21:08:17 +0000 From: Alexey Brodkin <Alexey.Brodkin@...opsys.com> To: "sergei.shtylyov@...entembedded.com" <sergei.shtylyov@...entembedded.com> CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "davem@...emloft.net" <davem@...emloft.net>, "stable@...r.kernel.org" <stable@...r.kernel.org>, "peppe.cavallaro@...com" <peppe.cavallaro@...com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org> Subject: Re: [PATCH v2] stmmac: fix check for phydev being open Hi Sergei, On Mon, 2015-09-07 at 23:53 +0300, Sergei Shtylyov wrote: > On 09/07/2015 11:50 PM, Alexey Brodkin wrote: > > > Current implementation via IS_ERR(phydev) may make no sense because > > of_phy_attach() returns NULL on failure instead of error value. > > > > Still for checking result of phy_connect() IS_ERR() is useful. > > > > To address both situations we use combined IS_ERR_OR_NULL() check. > > > > Cc: Giuseppe Cavallaro <peppe.cavallaro@...com> > > Cc: linux-kernel@...r.kernel.org > > Cc: stable@...r.kernel.org > > Cc: David Miller <davem@...emloft.net> > > Cc: Sergei Shtylyov <sergei.shtylyov@...entembedded.com> > > Signed-off-by: Alexey Brodkin <abrodkin@...opsys.com> > > --- > > > > Changes compared to v1: > > * Use IS_ERR_OR_NULL() instead of discrete checks for null and err > > > > drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c > > index 864b476..7985d8a 100644 > > --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c > > +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c > > @@ -837,7 +837,7 @@ static int stmmac_init_phy(struct net_device *dev) > > interface); > > } > > > > - if (IS_ERR(phydev)) { > > + if (IS_ERR_OR_NULL(phydev)) { > > pr_err("%s: Could not attach to PHY\n", dev->name); > > return PTR_ERR(phydev); > > Hm, in case of phydev == NULL, you're going to return 0 here... is that > what you want? Ah, right. So then the question would be what's a proper error code for !phydev: -ENOENT or -ENODEV? -Alexey-- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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