linux-kernel - Re: [PATCH] debugfs.c: Fix error checking for debugfs_create

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Date:   Tue, 30 May 2023 16:19:13 +0500
From:   Osama Muhammad <osmtendev@...il.com>
To:     Kalle Valo <kvalo@...nel.org>
Cc:     nbd@....name, ryder.lee@...iatek.com, lorenzo@...nel.org,
        shayne.chen@...iatek.com, davem@...emloft.net,
        linux-wireless@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] debugfs.c: Fix error checking for debugfs_create_dir

Hi,

In the previous email mistakenly I have referenced debugfs_create_file
but it's the same for debugfs_create_dir also.

Here is the link to comment above the function debugfs_create_dir
https://elixir.bootlin.com/linux/latest/source/fs/debugfs/inode.c#L564

Thanks,
Osmten

On Tue, 30 May 2023 at 16:02, Osama Muhammad <osmtendev@...il.com> wrote:
>
> Hi,
>
> I will keep that in mind and send with the right subject while
> submitting a revision of the patch.
>
> Regarding the patch after researching more into it I have come to know
> that the debugfs
> API will not return null on error but an ERR_PTR. The modern wisdom
> about it is to ignore the errors returned by the function as stated in
> the comment  above the function debugfs_create_file.
>
> > * 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.
> Here is the link to comment :-
> https://elixir.bootlin.com/linux/latest/source/fs/debugfs/inode.c#L451
>
> Considering this, I will send the revision of the patch by removing
> error checks. Please correct me if  there are any concerns with this.
>
> Thanks,
> Osmten
>
> On Tue, 30 May 2023 at 15:29, Kalle Valo <kvalo@...nel.org> wrote:
> >
> > Osama Muhammad <osmtendev@...il.com> writes:
> >
> > > This patch fixes the error checking in debugfs.c in
> > > debugfs_create_dir. The correct way to check if an error occurred
> > > is using 'IS_ERR' inline function.
> > >
> > > Signed-off-by: Osama Muhammad <osmtendev@...il.com>
> >
> > The title is wrong, please see the wiki page below how to create titles.
> >
> > Also no need to say "This patch fixes..", saying "Fix..." is enough.
> >
> > --
> > https://patchwork.kernel.org/project/linux-wireless/list/
> >
> > https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches