netdev - Re: [PATCH] net: mac80211: use IS

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Message-ID: <f23c038b2b586a45a8b3c757495d5bb51ee4ac7e.camel@sipsolutions.net>
Date:   Tue, 18 Apr 2023 10:36:14 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     yingsha xu <ysxu@...t.edu.cn>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Jiri Benc <jbenc@...e.cz>,
        "John W. Linville" <linville@...driver.com>
Cc:     hust-os-kernel-patches@...glegroups.com,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: mac80211: use IS_ERR to check return value

On Sun, 2023-04-16 at 16:30 +0800, yingsha xu wrote:
> According to the annotation of function debugfs_create_fs, if
> an error occurs, ERR_PTR(-ERROR) will be returned instead of
> a null pointer or zero value.
> 
> Fix it by using IS_ERR().

I don't this this is right, or fixed anything ...

If debugfs indeed returned an ERR_PTR() value, then the later debugfs
adds will do nothing.

Since it doesn't look like debugfs_create_dir() can actually return NULL
these days (not sure it ever could), I guess we can even remove the
check.

But you could've just read the comment there too, to know what the NULL
check was about ...

johannes