* Lee Duncan <leeman.duncan@xxxxxxxxx> [2022-09-28 11:13:50]:
> From: Lee Duncan <lduncan@xxxxxxxx>
>
> Some storage, such as AIX VDASD (virtual storage) and IBM 2076
> (front end) do not like the recent commit:
>
> commit c92a6b5d6335 ("scsi: core: Query VPD size before getting full page")
>
> That commit changed getting SCSI VPD pages so that we now read
> just enough of the page to get the actual page size, then read
> the whole page in a second read. The problem is that the above
> mentioned hardware returns zero for the page size, because of
> a firmware error. In such cases, until the firmware is fixed,
> this new black flag says to revert to the original method of
> reading the VPD pages, i.e. try to read as a whole buffer's
> worth on the first try.
>
> Fixes: c92a6b5d6335 ("scsi: core: Query VPD size before getting full page")
> Reported-by: Martin Wilck <mwilck@xxxxxxxx>
> Suggested-by: Hannes Reinecke <hare@xxxxxxx>
> Signed-off-by: Lee Duncan <lduncan@xxxxxxxx>
Facing similar problem on latest upstream kernel and this fixes it in my
testing.
Incase this helps:
$ lsslot
# Slot Description Linux Name Device(s)
U9080.HEX.134C1E8-V9-C0 Virtual I/O Slot 30000000 vty
U9080.HEX.134C1E8-V9-C2 Virtual I/O Slot 30000002 l-lan
U9080.HEX.134C1E8-V9-C109 Virtual I/O Slot 3000006d v-scsi
$ ls-vscsi
host0 U9080.HEX.134C1E8-V9-C109-T0
$ lsscsi
[0:0:1:0] disk AIX VDASD 0001 /dev/sda
[0:0:2:0] cd/dvd AIX VOPTA /dev/sr0
Tested-by: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx>
--
Thanks and Regards
Srikar Dronamraju
