linux-kernel - 回复: [PATCH net v1] bna:Fix error checking for debugfs_create

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Message-ID: <SG2PR06MB37438F03D13983B7F603E43DBD37A@SG2PR06MB3743.apcprd06.prod.outlook.com>
Date:   Thu, 13 Jul 2023 09:05:15 +0000
From:   王明-软件底层技术部 
        <machel@...o.com>
To:     Randy Dunlap <rdunlap@...radead.org>
CC:     Rasesh Mody <rmody@...vell.com>,
        Sudarsana Kalluru <skalluru@...vell.com>,
        "GR-Linux-NIC-Dev@...vell.com" <GR-Linux-NIC-Dev@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Krishna Gudipati <kgudipat@...cade.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: 回复: [PATCH net v1] bna:Fix error checking for debugfs_create_dir()

Ok, so I think we should delete the check operation. What do you think? If it is consistent, I will submit it again
: )
Ming
-----邮件原件-----
发件人: Randy Dunlap <rdunlap@...radead.org> 
发送时间: 2023年7月13日 13:50
收件人: 王明-软件底层技术部 <machel@...o.com>; Rasesh Mody <rmody@...vell.com>; Sudarsana Kalluru <skalluru@...vell.com>; GR-Linux-NIC-Dev@...vell.com; David S. Miller <davem@...emloft.net>; Eric Dumazet <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>; Paolo Abeni <pabeni@...hat.com>; Krishna Gudipati <kgudipat@...cade.com>; netdev@...r.kernel.org; linux-kernel@...r.kernel.org
抄送: opensource.kernel <opensource.kernel@...o.com>
主题: Re: [PATCH net v1] bna:Fix error checking for debugfs_create_dir()

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Hi--

On 7/12/23 22:38, Wang Ming wrote:
> The debugfs_create_dir() function returns error pointers, it never 
> returns NULL. Most incorrect error checks were fixed, but the one in 
> bnad_debugfs_init() was forgotten.
>
> Fix the remaining error check.
>
> Signed-off-by: Wang Ming <machel@...o.com>
>
> Fixes: 7afc5dbde091 ("bna: Add debugfs interface.")

Comment from fs/debugfs/inode.c:

 * NOTE: it's expected that most callers should _ignore_ the errors returned
 * by this function. Other debugfs functions handle the fact that the "dentry"
 * passed to them could be an error and they don't crash in that case.
 * Drivers should generally work fine even if debugfs fails to init anyway.

so no, drivers should not usually care about debugfs function call results.
Is there some special case here?

> ---
>  drivers/net/ethernet/brocade/bna/bnad_debugfs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/brocade/bna/bnad_debugfs.c 
> b/drivers/net/ethernet/brocade/bna/bnad_debugfs.c
> index 04ad0f2b9677..678a3668a041 100644
> --- a/drivers/net/ethernet/brocade/bna/bnad_debugfs.c
> +++ b/drivers/net/ethernet/brocade/bna/bnad_debugfs.c
> @@ -512,7 +512,7 @@ bnad_debugfs_init(struct bnad *bnad)
>       if (!bnad->port_debugfs_root) {
>               bnad->port_debugfs_root =
>                       debugfs_create_dir(name, bna_debugfs_root);
> -             if (!bnad->port_debugfs_root) {
> +             if (IS_ERR(bnad->port_debugfs_root)) {
>                       netdev_warn(bnad->netdev,
>                                   "debugfs root dir creation failed\n");
>                       return;

--
~Randy