linux-kernel - Re: [PATCH 01/13] net: ravb: Check return value of reset_control

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Message-ID: <06c3815d-3ec7-7e2e-8ef7-6fd9caa4cf04@omp.ru>
Date:   Fri, 24 Nov 2023 22:04:20 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     claudiu beznea <claudiu.beznea@...on.dev>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <p.zabel@...gutronix.de>, <yoshihiro.shimoda.uh@...esas.com>,
        <geert+renesas@...der.be>, <wsa+renesas@...g-engineering.com>,
        <biju.das.jz@...renesas.com>,
        <prabhakar.mahadev-lad.rj@...renesas.com>,
        <sergei.shtylyov@...entembedded.com>,
        <mitsuhiro.kimura.kc@...esas.com>, <masaru.nagai.vx@...esas.com>
CC:     <netdev@...r.kernel.org>, <linux-renesas-soc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH 01/13] net: ravb: Check return value of
 reset_control_deassert()

On 11/21/23 8:59 AM, claudiu beznea wrote:

[...]
>>> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>>>
>>> reset_control_deassert() could return an error. Some devices cannot work
>>> if reset signal de-assert operation fails. To avoid this check the return
>>> code of reset_control_deassert() in ravb_probe() and take proper action.
>>>
>>> Fixes: 0d13a1a464a0 ("ravb: Add reset support")
>>> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>>> ---
>>>  drivers/net/ethernet/renesas/ravb_main.c | 7 ++++++-
>>>  1 file changed, 6 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
>>> index c70cff80cc99..342978bdbd7e 100644
>>> --- a/drivers/net/ethernet/renesas/ravb_main.c
>>> +++ b/drivers/net/ethernet/renesas/ravb_main.c
>>> @@ -2645,7 +2645,12 @@ static int ravb_probe(struct platform_device *pdev)
>>>  	ndev->features = info->net_features;
>>>  	ndev->hw_features = info->net_hw_features;
>>>  
>>> -	reset_control_deassert(rstc);
>>> +	error = reset_control_deassert(rstc);
>>> +	if (error) {
>>> +		free_netdev(ndev);
>>> +		return error;
>>
>>   No, please use *goto* here. And please fix up the order of statements under
>> the out_release label before doing that.
> 
> This will lead to a bit more complicated patch, AFAICT. I tried to keep it

   It's OK! :-)

> simple for a fix. Same thing for patch 2.

   Patch 2 is not as simple as it could have been...

[...]

MBR, Sergey