linux-kernel - RE: [PATCH 1/4] drivers/mmc/host/dw

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Message-id: <016401cd94ba$733937d0$59aba770$%jun@samsung.com>
Date:	Mon, 17 Sep 2012 18:54:37 +0900
From:	Seungwon Jeon <tgih.jun@...sung.com>
To:	'Peter Senna Tschudin' <peter.senna@...il.com>, cjb@...top.org
Cc:	will.newton@...tec.com, jh80.chung@...sung.com,
	kyungmin.park@...sung.com, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: RE: [PATCH 1/4] drivers/mmc/host/dw_mmc.c: fix error return code

On Monday, September 17, 2012, Peter Senna Tschudin <peter.senna@...il.com> wrote:
> From: Peter Senna Tschudin <peter.senna@...il.com>
> 
> Convert a nonnegative error return code to a negative one, as returned
> elsewhere in the function.
> 
> A simplified version of the semantic match that finds this problem is as
> follows: (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> (
> if@p1 (\(ret < 0\|ret != 0\))
>  { ... return ret; }
> |
> ret@p1 = 0
> )
> ... when != ret = e1
>     when != &ret
> *if(...)
> {
>   ... when != ret = e2
>       when forall
>  return ret;
> }
> // </smpl>
> 
> Signed-off-by: Peter Senna Tschudin <peter.senna@...il.com>
> ---
>  drivers/mmc/host/dw_mmc.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index 36f98c0..7ad5176 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -2039,8 +2039,10 @@ int dw_mci_probe(struct dw_mci *host)
>  	tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
>  	host->card_workqueue = alloc_workqueue("dw-mci-card",
>  			WQ_MEM_RECLAIM | WQ_NON_REENTRANT, 1);
> -	if (!host->card_workqueue)
> +	if (!host->card_workqueue) {
> +		err = -ENOMEM;
ret is expected instead of err.
err isn't defined.

Thanks,
Seungwon Jeon

>  		goto err_dmaunmap;
> +	}
>  	INIT_WORK(&host->card_work, dw_mci_work_routine_card);
>  	ret = request_irq(host->irq, dw_mci_interrupt, host->irq_flags, "dw-mci", host);
>  	if (ret)
> --
> 1.7.11.4

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