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

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Message-ID: <20141018193539.GA20479@lunn.ch>
Date:	Sat, 18 Oct 2014 21:35:39 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Michael Opdenacker <michael.opdenacker@...e-electrons.com>
Cc:	andrew@...n.ch, ezequiel.garcia@...e-electrons.com,
	dwmw2@...radead.org, computersforpeace@...il.com,
	jg1.han@...sung.com, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mtd: orion_nand: fix error code path in probe

On Thu, Oct 16, 2014 at 06:58:35AM +0200, 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>

Acked-by: Andrew Lunn <andrew@...n.ch>

I wanted to test it, but i don't have easy access to a device using
nand. All mine are SPI based :-(

      Andrew
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