[PATCH v2 1/2] scsi: sd: change allow_restart to bool in sysfs interface

[weiping zhang <zhangweiping@xxxxxxxxxxxxxxx>]

/sys/class/scsi_disk/0:2:0:0/allow_restart can be changed to 0 unexpectly
by writing invalid string, like following:

echo asdf > /sys/class/scsi_disk/0:2:0:0/allow_restart

Signed-off-by: weiping zhang <zhangweiping@xxxxxxxxxxxxxxx>
---
 drivers/scsi/sd.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 3ef2214..e653dc5 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -253,6 +253,7 @@ static ssize_t
 allow_restart_store(struct device *dev, struct device_attribute *attr,
 		    const char *buf, size_t count)
 {
+	bool v;
 	struct scsi_disk *sdkp = to_scsi_disk(dev);
 	struct scsi_device *sdp = sdkp->device;
 
@@ -262,7 +263,10 @@ allow_restart_store(struct device *dev, struct device_attribute *attr,
 	if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 		return -EINVAL;
 
-	sdp->allow_restart = simple_strtoul(buf, NULL, 10);
+	if (kstrtobool(buf, &v))
+		return -EINVAL;
+
+	sdp->allow_restart = v ? 1 : 0;
 
 	return count;
 }
-- 
2.9.4