linux-kernel - Re: [PATCH v2 net] net: Add error pointer check in bcmsysport.c

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Message-ID: <CAEKBCKPkJ7DSku0w1injh55yd2HJdK0S3KPqWM_dUPQBAQD3pw@mail.gmail.com>
Date: Mon, 23 Sep 2024 22:24:18 +0545
From: Dipendra Khadka <kdipendra88@...il.com>
To: Simon Horman <horms@...nel.org>
Cc: andrew@...n.ch, florian.fainelli@...adcom.com, davem@...emloft.net, 
	edumazet@...gle.com, bcm-kernel-feedback-list@...adcom.com, kuba@...nel.org, 
	pabeni@...hat.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 net] net: Add error pointer check in bcmsysport.c

Hi Simon,

On Mon, 23 Sept 2024 at 22:04, Simon Horman <horms@...nel.org> wrote:
>
> On Mon, Sep 23, 2024 at 05:38:58AM +0000, Dipendra Khadka wrote:
> > Add error pointer checks in bcm_sysport_map_queues() and
> > bcm_sysport_unmap_queues() before deferencing 'dp'.
>
> nit: dereferencing
>
>      Flagged by checkpatch.pl --codespell
>
> >
> > Signed-off-by: Dipendra Khadka <kdipendra88@...il.com>
>
> This patch does not compile.
> Please take care to make sure your paches compile.
>
> And, moroever, please slow down a bit.  Please take some time to learn the
> process by getting one patch accepted. Rather going through that process
> with several patches simultaneously.
>
> > ---
> > v2:
> >   - Change the subject of the patch to net
>
> I'm sorry to say that the subject is still not correct.
>
> Looking over the git history for this file, I would go for
> a prefix of 'net: systemport: '. I would also pass on mentioning
> the filename in the subject. Maybe:
>
>         Subject: [PATCH v3 net] net: systemport: correct error pointer handling
>
> Also, I think that it would be better, although more verbose,
> to update these functions so that the assignment of dp occurs
> just before it is checked.
>
> In the case of bcm_sysport_map_queues(), that would look something like this
> (completely untested!):
>
> diff --git a/drivers/net/ethernet/broadcom/bcmsysport.c b/drivers/net/ethernet/broadcom/bcmsysport.c
> index c9faa8540859..7411f69a8806 100644
> --- a/drivers/net/ethernet/broadcom/bcmsysport.c
> +++ b/drivers/net/ethernet/broadcom/bcmsysport.c
> @@ -2331,11 +2331,15 @@ static const struct net_device_ops bcm_sysport_netdev_ops = {
>  static int bcm_sysport_map_queues(struct net_device *dev,
>                                   struct net_device *slave_dev)
>  {
> -       struct dsa_port *dp = dsa_port_from_netdev(slave_dev);
>         struct bcm_sysport_priv *priv = netdev_priv(dev);
>         struct bcm_sysport_tx_ring *ring;
>         unsigned int num_tx_queues;
>         unsigned int q, qp, port;
> +       struct dsa_port *dp;
> +
> +       dp = dsa_port_from_netdev(slave_dev);
> +       if (IS_ERR(dp))
> +               return PTR_ERR(dp);
>
>
>         /* We can't be setting up queue inspection for non directly attached
>          * switches
>
>
> This patch is now targeted at 'net'. Which means that you believe
> it is a bug fix. I'd say that is reasonable, though it does seem to
> be somewhat theoretical. But in any case, a bug fix should
> have a Fixes tag, which describes the commit that added the bug.
>
> Alternatively, if it is not a bug fix, then it should be targeted at
> net-next (and not have a Fixes tag). Please note that net-next is currently
> closed for the v6.12 merge window. It shold re-open after v6.12-rc1 has
> been released, which I expect to occur about a week for now. You should
> wait for net-next to re-open before posting non-RFC patches for it.
>
> Lastly, when reposting patches, please note the 24h rule.
> https://docs.kernel.org/process/maintainer-netdev.html
>

Thank you so much for the response and the suggestions. I will follow
everything you have said and whatever I have to.
I was just hurrying to see my patch accepted.

> --
> pw-bot: changes-requested
>
>

Best Regards,
Dipendra Khadka