netdev - Re: [PATCH] net/mlx5e: Fix an error code in mlx5e_arfs_create

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Date:   Thu, 03 Jun 2021 12:28:34 -0700
From:   Saeed Mahameed <saeed@...nel.org>
To:     Mark Zhang <markzhang@...dia.com>,
        Yang Li <yang.lee@...ux.alibaba.com>
Cc:     leon@...nel.org, davem@...emloft.net, kuba@...nel.org,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net/mlx5e: Fix an error code in
 mlx5e_arfs_create_tables()

On Wed, 2021-06-02 at 19:49 +0800, Mark Zhang wrote:
> On 6/2/2021 6:09 PM, Yang Li wrote:
> > When the code execute 'if (!priv->fs.arfs->wq)', the value of err
> > is 0.
> > So, we use -ENOMEM to indicate that the function
> > create_singlethread_workqueue() return NULL.
> > 
> > Clean up smatch warning:
> > drivers/net/ethernet/mellanox/mlx5/core/en_arfs.c:373
> > mlx5e_arfs_create_tables() warn: missing error code 'err'.
> > 
> > Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> > Fixes: 'commit f6755b80d693 ("net/mlx5e: Dynamic alloc arfs table
> > for netdev when needed")'

This is not the right format.

Please use the following command to generate the fixes tag:
git log -1 --abbrev=12 --format='Fixes: %h ("%s")' f6755b80d693

> > Signed-off-by: Yang Li <yang.lee@...ux.alibaba.com>
> > ---
> >   drivers/net/ethernet/mellanox/mlx5/core/en_arfs.c | 4 +++-
> >   1 file changed, 3 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_arfs.c
> > b/drivers/net/ethernet/mellanox/mlx5/core/en_arfs.c
> > index 5cd466e..2949437 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/en_arfs.c
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_arfs.c
> > @@ -369,8 +369,10 @@ int mlx5e_arfs_create_tables(struct mlx5e_priv
> > *priv)
> >         spin_lock_init(&priv->fs.arfs->arfs_lock);
> >         INIT_LIST_HEAD(&priv->fs.arfs->rules);
> >         priv->fs.arfs->wq =
> > create_singlethread_workqueue("mlx5e_arfs");
> > -       if (!priv->fs.arfs->wq)
> > +       if (!priv->fs.arfs->wq) {
> > +               err = -ENOMEM;
> >                 goto err;
> > +       }
> >   

you can just initialize err to -ENOMEM; on declaration. 

> >         for (i = 0; i < ARFS_NUM_TYPES; i++) {
> >                 err = arfs_create_table(priv, i);
> 
> Maybe also need to "destroy_workqueue(priv->fs.arfs->wq);" in
> err_des.

yes, it can be in the same patch.

Thanks a lot.