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SubjectRe: [PATCH v3] stmmac: fix check for phydev being open
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Hello.

On 09/08/2015 03:46 PM, Alexey Brodkin wrote:

>>> 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@cogentembedded.com>
>>> Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
>>> Cc: linux-kernel@vger.kernel.org
>>> Cc: stable@vger.kernel.org
>>> Cc: David Miller <davem@davemloft.net>
>>> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
>>> ---
>>>
>>> Changes compared to v2:
>>> * Updated commit message with mention of of_phy_connect() instead of
>>> of_phy_attach().
>>> * Return ENODEV in case of of_phy_connect() failure
>>>
>>> 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 | 7 +++++--
>>> 1 file changed, 5 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>>> index 864b476..e2c9c86 100644
>>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>>> @@ -837,9 +837,12 @@ 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);
>>> + if (!phydev)
>>> + return -ENODEV;
>>> + else
>>> + return PTR_ERR(phydev);
>>
>> Don't need *else* after *return* and scripts/checkpatch.pl should have
>> complained about that.
>
> ./scripts/checkpatch.pl 0001-stmmac-fix-check-for-phydev-being-open.patch
> total: 0 errors, 0 warnings, 0 checks, 14 lines checked

Hm... I bet I saw such warning from checkpatch.pl recently (it was a false
positive though, so maybe the check was removed recently, not sure). Your
patch is clean indeed, however my comment is still valid.

> -Alexey

MBR, Sergei



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