linux-kernel - Re: [PATCH] staging: iio: fix ad7606

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Message-ID: <CAMuHMdUxaSwoabbFP0Q4gOGoE5bq0RkOUPoyF7Z_XF6e9=GsBg@mail.gmail.com>
Date:	Mon, 30 May 2016 15:54:16 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Lars-Peter Clausen <lars@...afoo.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ksenija Stanojevic <ksenija.stanojevic@...il.com>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Hartmut Knaack <knaack.h@....de>,
	Peter Meerwald-Stadler <pmeerw@...erw.net>,
	Ioana Ciornei <ciorneiioana@...il.com>,
	Daniel Baluta <daniel.baluta@...el.com>,
	linux-iio@...r.kernel.org,
	driverdevel <devel@...verdev.osuosl.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] staging: iio: fix ad7606_spi regression

On Mon, May 30, 2016 at 3:50 PM, Arnd Bergmann <arnd@...db.de> wrote:
> As pointed out by Geert Uytterhoeven, the patch was incorrect
> and breaks the driver, which was fortunately pointed out by
> this gcc warning:
>
> drivers/staging/iio/adc/ad7606_spi.c: In function ‘ad7606_spi_read_block’:
> drivers/staging/iio/adc/ad7606_spi.c:34: warning: ‘data’ is used uninitialized in this function
>
> The effect of the patch is that the data is copied into
> a random memory location (from the uninitialized pointer)
> instead of being byteswapped in place.
>
> This adds the initialization for the 'data' variable back
> to restore the original behavior.
>
> Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
> Cc: Ksenija Stanojevic <ksenija.stanojevic@...il.com>
> Fixes: 87787e5ef727 ("Staging: iio: Fix sparse endian warning")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds