* Patch "scsi: ses: don't ask for diagnostic pages repeatedly during probe" has been added to the 4.9-stable tree
@ 2018-03-18 16:04 gregkh
0 siblings, 0 replies; only message in thread
From: gregkh @ 2018-03-18 16:04 UTC (permalink / raw)
To: dongyang.li, alexander.levin, gregkh, jason.ozolins, martin.petersen
Cc: stable, stable-commits
This is a note to let you know that I've just added the patch titled
scsi: ses: don't ask for diagnostic pages repeatedly during probe
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
scsi-ses-don-t-ask-for-diagnostic-pages-repeatedly-during-probe.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From foo@baz Sun Mar 18 16:55:33 CET 2018
From: Li Dongyang <dongyang.li@anu.edu.au>
Date: Tue, 14 Nov 2017 10:48:04 +1100
Subject: scsi: ses: don't ask for diagnostic pages repeatedly during probe
From: Li Dongyang <dongyang.li@anu.edu.au>
[ Upstream commit 9c0a50022b8ac7e863e6ec8342fa476fe5d1d75c ]
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.li@anu.edu.au>
Tested-by: Jason Ozolins <jason.ozolins@hpe.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/scsi/ses.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
--- a/drivers/scsi/ses.c
+++ b/drivers/scsi/ses.c
@@ -578,13 +578,16 @@ static void ses_enclosure_data_process(s
}
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);
@@ -615,7 +618,7 @@ static int ses_intf_add(struct device *c
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;
@@ -727,7 +730,7 @@ static int ses_intf_add(struct device *c
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;
Patches currently in stable-queue which might be from dongyang.li@anu.edu.au are
queue-4.9/scsi-ses-don-t-ask-for-diagnostic-pages-repeatedly-during-probe.patch
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2018-03-18 16:04 Patch "scsi: ses: don't ask for diagnostic pages repeatedly during probe" has been added to the 4.9-stable tree gregkh
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