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Message-ID: <27105f25-f3f9-0856-86e5-86236ce83dee@infradead.org>
Date: Wed, 12 Jul 2023 22:50:12 -0700
From: Randy Dunlap <rdunlap@...radead.org>
To: Wang Ming <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
Cc: opensource.kernel@...o.com
Subject: Re: [PATCH net v1] bna:Fix error checking for debugfs_create_dir()
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
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