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Re: [PATCH] dmaengine: st_fdma: fix uninitialized variable access

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  Re: [PATCH] dmaengine: st_fdma: fix uninitialized variable access Peter Griffin <peter.griffin@linaro.org> - 2016-10-19 16:40 +0200

#1503716 — Re: [PATCH] dmaengine: st_fdma: fix uninitialized variable access

Hi Arnd,

On Wed, 19 Oct 2016, Arnd Bergmann wrote:

> The newly added st_fdma driver introduces a build warning for
> allmodconfig when we add '-Wmaybe-uninitialized':
> 
> drivers/dma/st_fdma.c: In function 'st_fdma_probe':
> drivers/dma/st_fdma.c:777:5: error: 'ret' may be used uninitialized in this function [-Werror=maybe-uninitialized]
> 
> The warning is correct, though this can't happen in practice
> as the check is redundant (we don't get to this function if
> the pointer is NULL). Even if the function were called with a
> NULL of_node, the check is not needed because of_property_read_u32
> can deal with a NULL argument by returning an error.
> 
> Removing the unnecessary code simplifies the function and avoids
> the condition that we get the warning for.
> 
> Fixes: 6b4cd727eaf1 ("dmaengine: st_fdma: Add STMicroelectronics FDMA engine driver support")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---

Acked-by: Peter Griffin <peter.griffin@linaro.org>

regards,

Peter.

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