[ARM] Fix Assabet reboot with SA1100 MTD map driver

Unfortunately, some devices forgot to reset the flash on reboot.
Arrange for the map driver to suspend & resume the flash to
ensure that it is in a sane state before rebooting.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/mtd/maps/sa1100-flash.c b/drivers/mtd/maps/sa1100-flash.c
index acf01ef9b575..c81bec7b14d5 100644
--- a/drivers/mtd/maps/sa1100-flash.c
+++ b/drivers/mtd/maps/sa1100-flash.c
@@ -440,9 +440,17 @@ static int sa1100_mtd_resume(struct device *dev)
                 info->mtd->resume(info->mtd);
         return 0;
 }
+
+static void sa1100_mtd_shutdown(struct device *dev)
+{
+        struct sa_info *info = dev_get_drvdata(dev);
+        if (info && info->mtd->suspend(info->mtd) == 0)
+                info->mtd->resume(info->mtd);
+}
 #else
 #define sa1100_mtd_suspend NULL
 #define sa1100_mtd_resume  NULL
+#define sa1100_mtd_shutdown NULL
 #endif
 
 static struct device_driver sa1100_mtd_driver = {
@@ -452,6 +460,7 @@ static struct device_driver sa1100_mtd_driver = {
         .remove         = __exit_p(sa1100_mtd_remove),
         .suspend        = sa1100_mtd_suspend,
         .resume         = sa1100_mtd_resume,
+        .shutdown       = sa1100_mtd_shutdown,
 };
 
 static int __init sa1100_mtd_init(void)