dm mpath: use hw_handler_params if attached hw_handler is same as requested
Let the requested m->hw_handler_params be used if the attached hardware
handler is the same handler as requested with m->hw_handler_name.
Signed-off-by: tang.junhui <tang.junhui@zte.com.cn>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 0caab4b..6400cff 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -850,18 +850,22 @@
attached_handler_name = scsi_dh_attached_handler_name(q, GFP_KERNEL);
if (attached_handler_name) {
/*
+ * Clear any hw_handler_params associated with a
+ * handler that isn't already attached.
+ */
+ if (m->hw_handler_name && strcmp(attached_handler_name, m->hw_handler_name)) {
+ kfree(m->hw_handler_params);
+ m->hw_handler_params = NULL;
+ }
+
+ /*
* Reset hw_handler_name to match the attached handler
- * and clear any hw_handler_params associated with the
- * ignored handler.
*
* NB. This modifies the table line to show the actual
* handler instead of the original table passed in.
*/
kfree(m->hw_handler_name);
m->hw_handler_name = attached_handler_name;
-
- kfree(m->hw_handler_params);
- m->hw_handler_params = NULL;
}
}