linux-kernel - Re: [PATCH v2] mtd: orion_nand: fix error code path in probe

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Date:	Thu, 16 Oct 2014 16:39:30 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Michael Opdenacker' <michael.opdenacker@...e-electrons.com>
Cc:	andrew@...n.ch, ezequiel.garcia@...e-electrons.com,
	dwmw2@...radead.org, computersforpeace@...il.com,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
	'Jingoo Han' <jg1.han@...sung.com>
Subject: Re: [PATCH v2] mtd: orion_nand: fix error code path in probe

On Thursday, October 16, 2014 1:59 PM, Michael Opdenacker wrote:
> 
> This replaces kzalloc() and ioremap() calls by devm_ functions
> in the probe() routine, which automatically release the corresponding
> resources when probe() fails or when the device is removed.
> 
> This simplifies simplifies the error management code, and brings
> the below improvements or changes:
> 
> A. Fixing a bug reported by "make coccicheck":
> 
> If "board = devm_kzalloc()" fails, the probe() function jumps
> incorrectly to label "no_res" and therefore returns without
> running iounmap().
> 
> B. Requesting the memory region
> 
> Using devm_ioremap_resource() makes the probe() function request
> the corresponding memory region before running ioremap(), as
> it is supposed to do.
> 
> C. Standardizing the error codes:
> 
> The use of devm_ioremap_resource() changes the return value:
>  * -ENOMEM instead of -EIO in case of ioremap() failure,
>  * -EINVAL instead of -ENODEV in case of platform_get_resource()
>    failure.
> 
> Signed-off-by: Michael Opdenacker <michael.opdenacker@...e-electrons.com>

Reviewed-by: Jingoo Han <jg1.han@...sung.com>

Best regards,
Jingoo Han

> ---
>  drivers/mtd/nand/orion_nand.c | 39 +++++++++++----------------------------
>  1 file changed, 11 insertions(+), 28 deletions(-)


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