netdev - Re: [PATCH net-next v1 09/10] crypto/octeontx2: register error interrupts for inline cptlf

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Message-ID: <20231211171530.GP5817@kernel.org>
Date: Mon, 11 Dec 2023 17:15:30 +0000
From: Simon Horman <horms@...nel.org>
To: Srujana Challa <schalla@...vell.com>
Cc: herbert@...dor.apana.org.au, davem@...emloft.net, kuba@...nel.org,
	linux-crypto@...r.kernel.org, netdev@...r.kernel.org,
	linux-doc@...r.kernel.org, bbrezillon@...nel.org, arno@...isbad.org,
	pabeni@...hat.com, edumazet@...gle.com, corbet@....net,
	sgoutham@...vell.com, bbhushan2@...vell.com, jerinj@...vell.com,
	sbhatta@...vell.com, hkelam@...vell.com, lcherian@...vell.com,
	gakula@...vell.com, ndabilpuram@...vell.com
Subject: Re: [PATCH net-next v1 09/10] crypto/octeontx2: register error
 interrupts for inline cptlf

On Mon, Dec 11, 2023 at 12:49:12PM +0530, Srujana Challa wrote:
> From: Nithin Dabilpuram <ndabilpuram@...vell.com>
> 
> Register errors interrupts for inline cptlf attached to PF driver
> so that SMMU faults and other errors can be reported.
> 
> Signed-off-by: Nithin Dabilpuram <ndabilpuram@...vell.com>

...

> diff --git a/drivers/crypto/marvell/octeontx2/otx2_cptpf_main.c b/drivers/crypto/marvell/octeontx2/otx2_cptpf_main.c
> index 7d44b54659bf..79afa3a451a7 100644
> --- a/drivers/crypto/marvell/octeontx2/otx2_cptpf_main.c
> +++ b/drivers/crypto/marvell/octeontx2/otx2_cptpf_main.c
> @@ -725,7 +725,7 @@ static int otx2_cptpf_probe(struct pci_dev *pdev,
>  {
>  	struct device *dev = &pdev->dev;
>  	struct otx2_cptpf_dev *cptpf;
> -	int err;
> +	int err, num_vec;
>  
>  	cptpf = devm_kzalloc(dev, sizeof(*cptpf), GFP_KERNEL);
>  	if (!cptpf)
> @@ -760,8 +760,11 @@ static int otx2_cptpf_probe(struct pci_dev *pdev,
>  	if (err)
>  		goto clear_drvdata;
>  
> -	err = pci_alloc_irq_vectors(pdev, RVU_PF_INT_VEC_CNT,
> -				    RVU_PF_INT_VEC_CNT, PCI_IRQ_MSIX);
> +	num_vec = pci_msix_vec_count(cptpf->pdev);
> +	if (num_vec <= 0)
> +		goto clear_drvdata;

Hi Srujana and Nithin,

This goto will result in the function returning err.
However, err is 0 here. Perhaps it should be set to
a negative error value instead?

Flagged by Smatch.

> +
> +	err = pci_alloc_irq_vectors(pdev, num_vec, num_vec, PCI_IRQ_MSIX);
>  	if (err < 0) {
>  		dev_err(dev, "Request for %d msix vectors failed\n",
>  			RVU_PF_INT_VEC_CNT);

...