scsi: scsi-sysfs: Adjust error returned for adapter reset request

If scsi_host_template->host_reset is NULL and the user requests an
adapter reset through

	echo adapter > /sys/class/scsi_host/hostx/host_reset

-EINVAL will be returned even though the "adapter" argument is perfectly
valid.

Change this so that we only return -EINVAL if the provided string is
invalid.  If the host does not implement a ->host_reset function we'll
return -EOPNOTSUPP.

[mkp: tweaked patch description]

Signed-off-by: weiping zhang <zhangweiping@didichuxing.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index d6984df..41891db 100644 (file)
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -303,6 +303,8 @@ store_host_reset(struct device *dev, struct device_attribute *attr,
 
        if (sht->host_reset)
                ret = sht->host_reset(shost, type);
+       else
+               ret = -EOPNOTSUPP;
 
 exit_store_host_reset:
        if (ret == 0)