linux-kernel - Re: [PATCH net] net: ethernet: marvell: octeontx2: nic: Add error pointer check in otx2

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Message-ID: <20240924071026.GB4029621@kernel.org>
Date: Tue, 24 Sep 2024 08:10:26 +0100
From: Simon Horman <horms@...nel.org>
To: Dipendra Khadka <kdipendra88@...il.com>
Cc: sgoutham@...vell.com, gakula@...vell.com, sbhatta@...vell.com,
	hkelam@...vell.com, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: ethernet: marvell: octeontx2: nic: Add error
 pointer check in otx2_ethtool.c

On Mon, Sep 23, 2024 at 11:31:34AM +0000, Dipendra Khadka wrote:
> Add error pointer check after calling otx2_mbox_get_rsp().
> 

Hi Dipendra,

Please add a fixes tag here (no blank line between it and your
Signed-off-by line).
> Signed-off-by: Dipendra Khadka <kdipendra88@...il.com>

As you have posted more than one patch for this driver, with very similar,
not overly complex or verbose changes, it might make sense to combine them
into a single patch. Or, if not, to bundle them up into a patch-set with a
cover letter.

Regarding the patch subject, looking at git history, I think
an appropriate prefix would be 'octeontx2-pf:'. I would go for
something like this:

  Subject: [PATCH net v2] octeontx2-pf: handle otx2_mbox_get_rsp errors

As for the code changes themselves, module the nits below, I agree the
error handling is consistent with that elsewhere in the same functions, and
is correct.

> ---
>  .../ethernet/marvell/octeontx2/nic/otx2_ethtool.c    | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
> index 0db62eb0dab3..36a08303752f 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
> +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
> @@ -343,6 +343,12 @@ static void otx2_get_pauseparam(struct net_device *netdev,
>  	if (!otx2_sync_mbox_msg(&pfvf->mbox)) {
>  		rsp = (struct cgx_pause_frm_cfg *)
>  		       otx2_mbox_get_rsp(&pfvf->mbox.mbox, 0, &req->hdr);
> +

nit: No blank line here.

> +		if (IS_ERR(rsp)) {
> +			mutex_unlock(&pfvf->mbox.lock);
> +			return;
> +		}
> +
>  		pause->rx_pause = rsp->rx_pause;
>  		pause->tx_pause = rsp->tx_pause;
>  	}
> @@ -1074,6 +1080,12 @@ static int otx2_set_fecparam(struct net_device *netdev,
>  
>  	rsp = (struct fec_mode *)otx2_mbox_get_rsp(&pfvf->mbox.mbox,
>  						   0, &req->hdr);
> +

Ditto.

> +	if (IS_ERR(rsp)) {
> +		err = PTR_ERR(rsp);
> +		goto end;
> +	}
> +
>  	if (rsp->fec >= 0)
>  		pfvf->linfo.fec = rsp->fec;
>  	else

-- 
pw-bot: changes-requested