James Bottomley wrote:
On Sun, 2008-08-17 at 15:18 -0500, michaelc@xxxxxxxxxxx wrote:
From: Mike Christie <michaelc@xxxxxxxxxxx>
The patch and description is from Aaro Koskinen. He sent us the
patch against our fedora kernel, but he is short on time and did not have
time to send it upstream, so I am sending it for him so it does not sit in
just our trees.
This patch applies to scsi-fc-fixes.
One of the things that's missing from this is really the problem it's
trying to solve ... the below is just an analysis of potential bugs in
the sym2 code.
Sorry. I meant to add a link to the mail with the bug report. Here is my
initial post:
http://marc.info/?l=linux-scsi&m=120898142212407&w=2
Basically users are trying to do a hot unplug and hotplug add of a disk.
They will do:
1. echo 1 > /sys/block/sdb/device/delete
(or do it from proc)
2. Remove the disk physically.
3. Insert new disk.
4. Rescan from sysfs
(or from proc).
5. For the rescan we can either get:
A. inquiry from scsi_scan.c will timeout and the driver's bus reset
funtion will do a BUS RESET (bdr failed and so we got to the bus reset
handler). This will succeed, and when the inqiury is resent it will
succeed and the rescan will find the device and everything is fine.
B. inquiry is failed with 0x100ff. We see this error message from
scsi_scan.c:
scsi_scan_host_selected: <1:0:0:0>
scsi scan: INQUIRY to host 1 channel 0 id 0 lun 0
scsi scan: 1st INQUIRY failed with code 0x100ff
I will let Aaro handle the other questions because I know nothing about SPI.
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