s390/blacklist: Perform subchannel scan only when needed

Move scheduling of a subchannel scan to those instances where new
devices may actually have become available. This reduces unnecessary
scan work in case devices were added to the blacklist.

Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/drivers/s390/cio/blacklist.c b/drivers/s390/cio/blacklist.c
index 77ee4da..b3f791b 100644 (file)
--- a/drivers/s390/cio/blacklist.c
+++ b/drivers/s390/cio/blacklist.c
@@ -260,16 +260,16 @@ static int blacklist_parse_proc_parameters(char *buf)
 
        parm = strsep(&buf, " ");
 
-       if (strcmp("free", parm) == 0)
+       if (strcmp("free", parm) == 0) {
                rc = blacklist_parse_parameters(buf, free, 0);
-       else if (strcmp("add", parm) == 0)
+               css_schedule_eval_all_unreg(0);
+       } else if (strcmp("add", parm) == 0)
                rc = blacklist_parse_parameters(buf, add, 0);
        else if (strcmp("purge", parm) == 0)
                return ccw_purge_blacklisted();
        else
                return -EINVAL;
 
-       css_schedule_eval_all_unreg(0);
 
        return rc;
 }