hwmon: (max1111) Fix race condition causing NULL pointer exception
authorPavel Herrmann <morpheus.ibis@gmail.com>
Sun, 17 Jul 2011 16:39:19 +0000 (18:39 +0200)
committerJean Delvare <khali@endymion.delvare>
Sun, 17 Jul 2011 16:39:19 +0000 (18:39 +0200)
commitd3f684f2820a7f42acef68bea6622d9032127fb2
tree0ca1227b9c1499093e7af42d01ad75f41481b5e1
parentfa8b69758e65b406c8010936b541cd00deef804d
hwmon: (max1111) Fix race condition causing NULL pointer exception

spi_sync call uses its spi_message parameter to keep completion information,
using a drvdata structure is not thread-safe. Use a mutex to prevent
multiple access to shared driver data.

Signed-off-by: Pavel Herrmann <morpheus.ibis@gmail.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Pavel Machek <pavel@ucw.cz>
Acked-by: Marek Vasut <marek.vasut@gmail.com>
Acked-by: Cyril Hrubis <metan@ucw.cz>
Tested-by: Stanislav Brabec <utx@penguin.cz>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: stable@kernel.org
drivers/hwmon/max1111.c