This is a note to let you know that I've just added the patch titled
IB/srp: Avoid duplicate devices from LUN scan
to the 3.0-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:
ib-srp-avoid-duplicate-devices-from-lun-scan.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From fd1b6c4a693c9cac59375ffb36ffe5d7c079037c Mon Sep 17 00:00:00 2001
From: Bart Van Assche <[email protected]>
Date: Wed, 13 Jul 2011 09:19:16 -0700
Subject: IB/srp: Avoid duplicate devices from LUN scan
From: Bart Van Assche <[email protected]>
commit fd1b6c4a693c9cac59375ffb36ffe5d7c079037c upstream.
SCSI scanning of a channel:id:lun triplet in Linux works as follows
(function scsi_scan_target() in drivers/scsi/scsi_scan.c):
- If lun == SCAN_WILD_CARD, send a REPORT LUNS command to the target
and process the result.
- If lun != SCAN_WILD_CARD, send an INQUIRY command to the LUN
corresponding to the specified channel:id:lun triplet to verify
whether the LUN exists.
So a SCSI driver must either take the channel and target id values in
account in its quecommand() function or it should declare that it only
supports one channel and one target id.
Currently the ib_srp driver does neither. As a result scanning the
SCSI bus via e.g. rescan-scsi-bus.sh causes many duplicate SCSI
devices to be created. For each 0:0:L device, several duplicates are
created with the same LUN number and with (C:I) != (0:0). Fix this by
declaring that the ib_srp driver only supports one channel and one
target id.
Signed-off-by: Bart Van Assche <[email protected]>
Acked-by: David Dillow <[email protected]>
Signed-off-by: Roland Dreier <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/infiniband/ulp/srp/ib_srp.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -2127,6 +2127,8 @@ static ssize_t srp_create_target(struct
return -ENOMEM;
target_host->transportt = ib_srp_transport_template;
+ target_host->max_channel = 0;
+ target_host->max_id = 1;
target_host->max_lun = SRP_MAX_LUN;
target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
Patches currently in stable-queue which might be from [email protected] are
queue-3.0/ib-srp-avoid-duplicate-devices-from-lun-scan.patch
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