linux-kernel - Re: [PATCH] mmc: add ifdef around fault_create_debugfs

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Date:	Mon, 9 Nov 2015 14:33:11 +0100
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Adrien Schildknecht <adrien+dev@...ischi.me>
Cc:	Shawn Lin <shawn.lin@...k-chips.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mmc: add ifdef around fault_create_debugfs_attr()

On 6 November 2015 at 13:15, Adrien Schildknecht <adrien+dev@...ischi.me> wrote:
> FAIL_MMC_REQUEST can be used without FAULT_INJECTION_DEBUG_FS.
> In this case fault_create_debugfs_attr() will always return an error and
> lead to the deletion of the whole debugfs directory.
>
> This patch makes sure that FAULT_INJECTION_DEBUG_FS is enabled before
> attempting to create the debugfs atttribute.
>
> Signed-off-by: Adrien Schildknecht <adrien+dev@...ischi.me>
> ---
>  drivers/mmc/core/debugfs.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
> index 154aced..13e842c 100644
> --- a/drivers/mmc/core/debugfs.c
> +++ b/drivers/mmc/core/debugfs.c
> @@ -259,11 +259,13 @@ void mmc_add_host_debugfs(struct mmc_host *host)
>         if (fail_request)
>                 setup_fault_attr(&fail_default_attr, fail_request);
>         host->fail_mmc_request = fail_default_attr;
> +#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
>         if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request",
>                                              root,
>                                              &host->fail_mmc_request)))
>                 goto err_node;
>  #endif
> +#endif
>         return;
>
>  err_node:
> --
> 2.6.2
>

I think you are solving this in the wrong way. Will it really makes
sense to use FAIL_MMC_REQUEST unless FAULT_INJECTION_DEBUG_FS is set,
I don't think so.

I suggest you to change FAIL_MMC_REQUEST from depending on
FAULT_INJECTION to FAULT_INJECTION_DEBUG_FS in /lib/Kconfig.debug.

Kind regards
Uffe
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