linux-kernel - Re: [PATCH] spi: rspi: avoid uninitialized variable access

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Message-ID: <58243D24.5080302@jinso.co.jp>
Date:   Thu, 10 Nov 2016 18:25:56 +0900
From:   Hiep Cao Minh <cm-hiep@...so.co.jp>
To:     Arnd Bergmann <arnd@...db.de>, Mark Brown <broonie@...nel.org>
CC:     Chris Brandt <chris.brandt@...esas.com>, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] spi: rspi: avoid uninitialized variable access

Hi Arnd,

Thanks for your fixed patch.

On 11/08/2016 10:46 PM, Arnd Bergmann wrote:
> The newly introduced rspi_pio_transfer_in_or_our() function must
> take either a valid 'rx' or 'tx' pointer, and has undefined behavior
> if both are NULL, as found by 'gcc -Wmaybe-unintialized':
>
> drivers/spi/spi-rspi.c: In function 'rspi_pio_transfer_in_or_our':
> drivers/spi/spi-rspi.c:558:5: error: 'len' may be used uninitialized in this function [-Werror=maybe-uninitialized]
Could you tell me what kind of GCC are you using?
I'd like to reproduce it on my environment, too.
I am using the Linaro's gcc of 
"gcc-linaro-arm-linux-gnueabihf-4.8-2014.04_linux".
But there is no error message like this on my environment.


Best regards,
Jinzai Solution Inc,
Hiep.