linux-kernel - Re: [PATCH] Octeontx2-af: Fix missing error code in cgx

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Message-ID: <9d1ecea4-c63c-4627-8512-98af3153b357@oracle.com>
Date: Tue, 14 Oct 2025 15:33:08 +0530
From: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
To: Paolo Abeni <pabeni@...hat.com>, Sunil Goutham <sgoutham@...vell.com>,
        Linu Cherian <lcherian@...vell.com>,
        Geetha sowjanya <gakula@...vell.com>, Jerin Jacob <jerinj@...vell.com>,
        hariprasad <hkelam@...vell.com>,
        Subbaraya Sundeep <sbhatta@...vell.com>,
        Andrew Lunn
 <andrew+netdev@...n.ch>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: dan.carpenter@...aro.org, kernel-janitors@...r.kernel.org,
        error27@...il.com
Subject: Re: [PATCH] Octeontx2-af: Fix missing error code in cgx_probe()

Hi Paolo,

On 14/10/25 15:17, Paolo Abeni wrote:
> 
> 
> On 10/10/25 10:42 PM, Harshit Mogalapalli wrote:
>> When CGX fails mapping to NIX, set the error code to -ENODEV, currently
>> err is zero and that is treated as success path.
>>
>> Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
>> Closes: https://lore.kernel.org/all/aLAdlCg2_Yv7Y-3h@stanley.mountain/
>> Fixes: d280233fc866 ("Octeontx2-af: Fix NIX X2P calibration failures")
>> Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
>> ---
>> This is based on static analysis with smatch and only compile tested.
>> ---
>>   drivers/net/ethernet/marvell/octeontx2/af/cgx.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/net/ethernet/marvell/octeontx2/af/cgx.c b/drivers/net/ethernet/marvell/octeontx2/af/cgx.c
>> index d374a4454836..ec0e11c77cbf 100644
>> --- a/drivers/net/ethernet/marvell/octeontx2/af/cgx.c
>> +++ b/drivers/net/ethernet/marvell/octeontx2/af/cgx.c
>> @@ -1981,6 +1981,7 @@ static int cgx_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>>   	    !is_cgx_mapped_to_nix(pdev->subsystem_device, cgx->cgx_id)) {
>>   		dev_notice(dev, "CGX %d not mapped to NIX, skipping probe\n",
>>   			   cgx->cgx_id);
>> +		err = -ENODEV;
>>   		goto err_release_regions;
>>   	}
>>   
> 
> Side note, a few lines below there is this check:
> 
> 	err = pci_alloc_irq_vectors(pdev, nvec, nvec, PCI_IRQ_MSIX);
> 	if (err < 0 || err != nvec) {
> 		dev_err(dev, "Request for %d msix vectors failed, err %d\n",
> 			nvec, err);
> 		goto err_release_regions;
> 	}
> 
> AFAICS err can never be a positive value in that error path, but the
> 
> 	if (err < 0 || err != nvec)
> 
> check is confusing and should possibly be changed to:
> 
> 	if (err < 0)

I agree, will send a patch for this.

Thanks for the suggestion.


Regards,
Harshit>
> /P
>