linux-kernel - Re: [PATCH] mm/cma_debug: Check return value of the debugfs_create

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Date:	Thu, 27 Aug 2015 17:38:13 +0200
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Alexander Kuleshov <kuleshovmail@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joonsoo Kim <js1304@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Stefan Strogin <stefan.strogin@...il.com>,
	Dmitry Safonov <d.safonov@...tner.samsung.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Alexander Kuleshov <kuleshovmail@...il.com>
Subject: Re: [PATCH] mm/cma_debug: Check return value of the debugfs_create_dir()

On Tue, Aug 25 2015, Alexander Kuleshov wrote:
> The debugfs_create_dir() function may fail and return error. If the
> root directory not created, we can't create anything inside it. This
> patch adds check for this case.
>
> Signed-off-by: Alexander Kuleshov <kuleshovmail@...il.com>

I’d also add a pr_warn but otherwise:

Acked-by: Michal Nazarewicz <mina86@...a86.com>

> ---
>  mm/cma_debug.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/mm/cma_debug.c b/mm/cma_debug.c
> index f8e4b60..bfb46e2 100644
> --- a/mm/cma_debug.c
> +++ b/mm/cma_debug.c
> @@ -171,6 +171,9 @@ static void cma_debugfs_add_one(struct cma *cma, int idx)
>  
>  	tmp = debugfs_create_dir(name, cma_debugfs_root);
>  
> +	if (!tmp)
> +		return;
> +
>  	debugfs_create_file("alloc", S_IWUSR, tmp, cma,
>  				&cma_alloc_fops);
>  

-- 
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