linux-kernel - Re: [PATCH 3.16.y-ckt 081/133] stmmac: fix check for phydev being open

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Date:	Wed, 30 Sep 2015 13:20:11 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	David Miller <davem@...emloft.net>,
	Alexey Brodkin <abrodkin@...opsys.com>
Subject: Re: [PATCH 3.16.y-ckt 081/133] stmmac: fix check for phydev being
 open

On Wed, Sep 30, 2015 at 02:23:17PM +0300, Sergei Shtylyov wrote:
> On 9/30/2015 12:50 PM, Luis Henriques wrote:
> 
> >3.16.7-ckt18 -stable review patch.  If anyone has any objections, please let me know.
> 
>    NAK on the same grounds as the 3.10 and 3.14 patches.
>

Ok, makes sense -- dropping this patch from the 3.16 queue.  Thanks!

Cheers,
--
Luís

> >------------------
> >
> >From: Alexey Brodkin <Alexey.Brodkin@...opsys.com>
> >
> >commit dfc50fcaad574e5c8c85cbc83eca1426b2413fa4 upstream.
> >
> >Current check of phydev with IS_ERR(phydev) may make not much sense
> >because of_phy_connect() returns NULL on failure instead of error value.
> >
> >Still for checking result of phy_connect() IS_ERR() makes perfect sense.
> >
> >So let's use combined check IS_ERR_OR_NULL() that covers both cases.
> >
> >Cc: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
> >Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>
> >Cc: linux-kernel@...r.kernel.org
> >Cc: David Miller <davem@...emloft.net>
> >Signed-off-by: Alexey Brodkin <abrodkin@...opsys.com>
> >Signed-off-by: David S. Miller <davem@...emloft.net>
> >Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
> >---
> >  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> >
> >diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> >index 641086fc14b5..936cdee0c22e 100644
> >--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> >+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> >@@ -810,8 +810,11 @@ static int stmmac_init_phy(struct net_device *dev)
> >
> >  	phydev = phy_connect(dev, phy_id_fmt, &stmmac_adjust_link, interface);
> >
> >-	if (IS_ERR(phydev)) {
> >+	if (IS_ERR_OR_NULL(phydev)) {
> >  		pr_err("%s: Could not attach to PHY\n", dev->name);
> >+		if (!phydev)
> >+			return -ENODEV;
> >+
> >  		return PTR_ERR(phydev);
> >  	}
> >
> 
> MBR, Sergei
> 
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