linux-kernel - Re: [PATCH] mmc:Fix error handling in the function mmc_blk

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Date:	Tue, 21 Jul 2015 19:03:33 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Nicholas Krause <xerofoify@...il.com>, ulf.hansson@...aro.org
Cc:	kuninori.morimoto.gx@...esas.com, jh80.chung@...sung.com,
	adrian.hunter@...el.com, chuanxiao.dong@...el.com,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc:Fix error handling in the function mmc_blk_remove

On Tue, 2015-07-21 at 09:29 -0400, Nicholas Krause wrote:
> This fixes error handling in the function mmc_blk_remove by
> checking the return value of the call to mmc_blk_part_switch
> and if it has failed by returning a error code we now print
> out on the console to the user that removed the mmc device
> has failed before returning immediately.

A removal function isn't allowed to fail.  Printing an error message
seems reasonable (though it should be printed using one of the dev_
logging functions), but returning early is not.

Ben.

> Signed-off-by: Nicholas Krause <xerofoify@...il.com>
> ---
>  drivers/mmc/card/block.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
> index c9c3d20..24af338 100644
> --- a/drivers/mmc/card/block.c
> +++ b/drivers/mmc/card/block.c
> @@ -2508,7 +2508,10 @@ static void mmc_blk_remove(struct mmc_card *card)
>  > 	> mmc_blk_remove_parts(card, md);
>  > 	> pm_runtime_get_sync(&card->dev);
>  > 	> mmc_claim_host(card->host);
> -> 	> mmc_blk_part_switch(card, md);
> +> 	> if (mmc_blk_part_switch(card, md)) {
> +> 	> 	> pr_crit("Unable to successfully remove %s due to failed mmc_blk_part_switch call\n", card->part[MMC_NUM_PHY_PARTITION].name);
> +> 	> 	> return;
> +> 	> }
>  > 	> mmc_release_host(card->host);
>  > 	> if (card->type != MMC_TYPE_SD_COMBO)
>  > 	> 	> pm_runtime_disable(&card->dev);
-- 
Ben Hutchings
No political challenge can be met by shopping. - George Monbiot


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