From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugme-daemon@bugzilla.kernel.org
Subject: [Bug 11619] New: Hotplug doesn't work with SAS1064
Date: Mon, 22 Sep 2008 02:49:03 -0700 (PDT)
Message-ID: <bug-11619-11613@http.bugzilla.kernel.org/>
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http://bugzilla.kernel.org/show_bug.cgi?id=11619

           Summary: Hotplug doesn't work with SAS1064
           Product: IO/Storage
           Version: 2.5
     KernelVersion: 2.6.27-rc6
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: SCSI
        AssignedTo: linux-scsi@vger.kernel.org
        ReportedBy: vseliverstov@yandex-team.ru


Latest working kernel version: 2.6.20
Earliest failing kernel version: 2.6.22
Hardware Environment: Any Intel-powered server with SAS1064 PCI-X SAS
controller
Problem Description: I have linux-box with SAS1064 PCI-X SAS Controller, and
I'm experiencing problems with hotswapping. When I detach disk from system,
replace it with another one, and trying to attach it again, nothing happens.
After reboot, it's OK - I have this disk attached and functioning. Interesting,
that if I try to attach old disk just after detaching it's OK too. 
I've tried following Vanilla kernel builds from linux git tree: 2.6.20, 2.6.22,
2.6.24, 2.6.26, 2.6.27-rc6 and it's worked only with 2.6.20. So, I tried to
bisect buggy commit between 2.6.20 and 2.6.22 versions.
Here is bad commit: df9e062ad994c4db683377b108c0dbed4690e4b0 

Steps to reproduce: 
- detach disk with:
# echo "scsi remove-single-device x y z k" > /proc/scsi/scsi
- physically remove it and insert another one;
- try to attach disk with:
# echo "scsi add-single-device x y z k" > /proc/scsi/scsi
or with
echo "- - -" > /sys/class/scsi_host/hostN/scan


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