staging: iio: fix ad7606_spi regression
authorArnd Bergmann <arnd@arndb.de>
Mon, 30 May 2016 13:50:24 +0000 (15:50 +0200)
committerJonathan Cameron <jic23@kernel.org>
Sat, 11 Jun 2016 16:56:53 +0000 (17:56 +0100)
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: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
Fixes: 87787e5ef727 ("Staging: iio: Fix sparse endian warning")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
drivers/staging/iio/adc/ad7606_spi.c

index 825da0769936ace09907977be92392dda5447407..9587fa86dc69589fc34aa0105584ef3b24add210 100644 (file)
@@ -21,7 +21,7 @@ static int ad7606_spi_read_block(struct device *dev,
 {
        struct spi_device *spi = to_spi_device(dev);
        int i, ret;
-       unsigned short *data;
+       unsigned short *data = buf;
        __be16 *bdata = buf;
 
        ret = spi_read(spi, buf, count * 2);