linux-kernel - Re: [PATCH] dmaengine: st_fdma: fix uninitialized variable access

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Date:   Wed, 19 Oct 2016 18:45:20 +0530
From:   Vinod Koul <vinod.koul@...el.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Patrice Chotard <patrice.chotard@...com>,
        Dan Williams <dan.j.williams@...el.com>,
        Ludovic Barre <ludovic.barre@...com>,
        Peter Griffin <peter.griffin@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, kernel@...inux.com,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: st_fdma: fix uninitialized variable access

On Wed, Oct 19, 2016 at 02:09:10PM +0200, 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.

Applied, thanks

-- 
~Vinod