From: Florian Fainelli <f.fainelli@gmail.com>
To: Paul Kocialkowski <paul.kocialkowski@bootlin.com>,
netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Cc: Andrew Lunn <andrew@lunn.ch>,
Michal Simek <michal.simek@xilinx.com>,
"David S . Miller" <davem@davemloft.net>,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
Heiner Kallweit <hkallweit1@gmail.com>
Subject: Re: [PATCH RESEND net] net: phy: xgmiitorgmii: Support generic PHY status read
Date: Fri, 15 Feb 2019 10:53:26 -0800 [thread overview]
Message-ID: <958bb823-3dc8-607f-3c38-3d902acb85a8@gmail.com> (raw)
In-Reply-To: <38f6708476e9beca4583ccc2a62e238a4981b735.camel@bootlin.com>
On 2/15/19 10:34 AM, Paul Kocialkowski wrote:
> Hi,
>
> On Fri, 2019-02-15 at 09:38 -0800, Florian Fainelli wrote:
>> On 2/15/19 8:32 AM, Paul Kocialkowski wrote:
>>> Some PHY drivers like the generic one do not provide a read_status
>>> callback on their own but rely on genphy_read_status being called
>>> directly.
>>>
>>> With the current code, this results in a NULL function pointer call.
>>> Call genphy_read_status instead when there is no specific callback.
>>>
>>> Fixes: f411a6160bd4 ("net: phy: Add gmiitorgmii converter support")
>>> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
>>> ---
>>> Added Fixes tag and net label for resend.
>>
>> You would want to use phy_read_status() which encapsulates that check as
>> well as checks that the phy_drv pointer is not NULL.
>
> Well, this driver is a bit different and our priv->phy_drv != phydev-
>> drv, so we can't use the helper directly. I should probably have
> mentionned it in the commit message, sorry!
>
> As I was mentionning to Andrew in the initial submission of this patch,
> this driver is a bit unusual since it represents a GMII to RGMII
> bridge, so it's not actually a PHY driver on its own -- it just sticks
> itself in between the actual PHY and the MAC.
Yes, my bad, you should still consider checking priv->phy_drv though, if
someone unbinds the PHY driver on either side, you are toast.
>
> Cheers and thanks for the review,
>
> Paul
>
>>> drivers/net/phy/xilinx_gmii2rgmii.c | 5 ++++-
>>> 1 file changed, 4 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/net/phy/xilinx_gmii2rgmii.c b/drivers/net/phy/xilinx_gmii2rgmii.c
>>> index 74a8782313cf..bd6084e315de 100644
>>> --- a/drivers/net/phy/xilinx_gmii2rgmii.c
>>> +++ b/drivers/net/phy/xilinx_gmii2rgmii.c
>>> @@ -44,7 +44,10 @@ static int xgmiitorgmii_read_status(struct phy_device *phydev)
>>> u16 val = 0;
>>> int err;
>>>
>>> - err = priv->phy_drv->read_status(phydev);
>>> + if (priv->phy_drv->read_status)
>>> + err = priv->phy_drv->read_status(phydev);
>>> + else
>>> + err = genphy_read_status(phydev);
>>> if (err < 0)
>>> return err;
>>>
>>>
>>
>>
--
Florian
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next prev parent reply other threads:[~2019-02-15 18:53 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-15 16:32 [PATCH RESEND net] net: phy: xgmiitorgmii: Support generic PHY status read Paul Kocialkowski
2019-02-15 17:02 ` Andrew Lunn
2019-02-15 17:38 ` Florian Fainelli
2019-02-15 18:34 ` Paul Kocialkowski
2019-02-15 18:53 ` Florian Fainelli [this message]
2019-02-19 9:56 ` Paul Kocialkowski
2019-02-19 17:25 ` Andrew Lunn
2019-02-20 6:58 ` Michal Simek
2019-02-21 10:24 ` Paul Kocialkowski
2019-02-21 11:03 ` Michal Simek
2019-02-27 8:43 ` Michal Simek
2019-02-27 9:05 ` Harini Katakam
2019-02-28 7:33 ` Harini Katakam
2019-03-09 12:09 ` Harini Katakam
2019-03-09 16:19 ` Andrew Lunn
2019-03-11 6:04 ` Harini Katakam
2019-03-11 12:27 ` Harini Katakam
2019-03-11 12:51 ` Michal Simek
2019-03-11 6:45 ` Michal Simek
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