netdev - Re: [PATCH] qlcnic: check pci_reset

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Date:   Mon, 3 Apr 2023 13:58:49 +0300
From:   Denis Plotnikov <den-plotnikov@...dex-team.ru>
To:     Simon Horman <simon.horman@...igine.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        shshaikh@...vell.com, manishc@...vell.com,
        GR-Linux-NIC-Dev@...vell.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Subject: Re: [PATCH] qlcnic: check pci_reset_function result


On 31.03.2023 20:52, Simon Horman wrote:
> On Fri, Mar 31, 2023 at 11:06:05AM +0300, Denis Plotnikov wrote:
>> Static code analyzer complains to unchecked return value.
>> It seems that pci_reset_function return something meaningful
>> only if "reset_methods" is set.
>> Even if reset_methods isn't used check the return value to avoid
>> possible bugs leading to undefined behavior in the future.
>>
>> Signed-off-by: Denis Plotnikov <den-plotnikov@...dex-team.ru>
> nit: The tree this patch is targeted at should be designated, probably
>       net-next, so the '[PATCH net-next]' in the subject.
>
>> ---
>>   drivers/net/ethernet/qlogic/qlcnic/qlcnic_ctx.c | 4 +++-
>>   1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_ctx.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_ctx.c
>> index 87f76bac2e463..39ecfc1a1dbd0 100644
>> --- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_ctx.c
>> +++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_ctx.c
>> @@ -628,7 +628,9 @@ int qlcnic_fw_create_ctx(struct qlcnic_adapter *dev)
>>   	int i, err, ring;
>>   
>>   	if (dev->flags & QLCNIC_NEED_FLR) {
>> -		pci_reset_function(dev->pdev);
>> +		err = pci_reset_function(dev->pdev);
>> +		if (err && err != -ENOTTY)
> Are you sure about the -ENOTTY part?
>
> It seems odd to me that an FLR would be required but reset is not supported.
No, I'm not sure. My logic is: if the reset method isn't set than 
pci_reset_function() returns -ENOTTY so treat that result as ok. 
pci_reset_function may return something different than -ENOTTY only if 
pci_reset_fn_methods[m].reset_fn is set.
>> +			return err;
>>   		dev->flags &= ~QLCNIC_NEED_FLR;
>>   	}
>>   
>> -- 
>> 2.25.1
>>