[REPOST PATCH] scsi: ses: don't ask for diagnostic pages repeatedly during probe

[Li Dongyang]

We are testing if there is a match with the ses device in a loop
by calling ses_match_to_enclosure(), which will issue scsi receive
diagnostics commands to the ses device for every device on the
same host.
On one of our boxes with 840 disks, it takes a long time to load
the driver:

[root@g1b-oss06 ~]# time modprobe ses

real    40m48.247s
user    0m0.001s
sys     0m0.196s

With the patch:

[root@g1b-oss06 ~]# time modprobe ses

real    0m17.915s
user    0m0.008s
sys     0m0.053s

Note that we still need to refresh page 10 when we see a new disk
to create the link.

Signed-off-by: Li Dongyang <dongyang...@anu.edu.au>
---
 drivers/scsi/ses.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/ses.c b/drivers/scsi/ses.c
index 11826c5c2dd4..62f04c0511cf 100644
--- a/drivers/scsi/ses.c
+++ b/drivers/scsi/ses.c
@@ -615,13 +615,16 @@ static void ses_enclosure_data_process(struct 
enclosure_device *edev,
 }
 
 static void ses_match_to_enclosure(struct enclosure_device *edev,
-                                  struct scsi_device *sdev)
+                                  struct scsi_device *sdev,
+                                  int refresh)
 {
+       struct scsi_device *edev_sdev = to_scsi_device(edev->edev.parent);
        struct efd efd = {
                .addr = 0,
        };
 
-       ses_enclosure_data_process(edev, to_scsi_device(edev->edev.parent), 0);
+       if (refresh)
+               ses_enclosure_data_process(edev, edev_sdev, 0);
 
        if (scsi_is_sas_rphy(sdev->sdev_target->dev.parent))
                efd.addr = sas_get_address(sdev);
@@ -652,7 +655,7 @@ static int ses_intf_add(struct device *cdev,
                struct enclosure_device *prev = NULL;
 
                while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) 
!= NULL) {
-                       ses_match_to_enclosure(edev, sdev);
+                       ses_match_to_enclosure(edev, sdev, 1);
                        prev = edev;
                }
                return -ENODEV;
@@ -768,7 +771,7 @@ static int ses_intf_add(struct device *cdev,
        shost_for_each_device(tmp_sdev, sdev->host) {
                if (tmp_sdev->lun != 0 || scsi_device_enclosure(tmp_sdev))
                        continue;
-               ses_match_to_enclosure(edev, tmp_sdev);
+               ses_match_to_enclosure(edev, tmp_sdev, 0);
        }
 
        return 0;
-- 
2.14.2