[PATCH 0/1] [BF:linux-azure] Revert "scsi: core: Cap scsi_host cmd_per_lun at can_queue"

Tim Gardner tim.gardner at canonical.com
Thu Oct 7 12:51:38 UTC 2021

BugLink: https://bugs.launchpad.net/bugs/1940564

SRU Justification


At least 2 Azure instances cannot boot with this stable patch applied. Upstream
is still working on the propoer solution. In the meantime, reverting this pacth
allows boot to continue.

[Test Plan]

Boot on the affected instance types.

[Where problems could occur]

This patch was merged in stable update v5.4.134. Its intent was
to provide a system level cap on the number of SCSI commands per LUN. Although
reverting this patch may allow possibiities for exceeding that cap, in
practice it rarely happed. There are also already some driver specifc
checks in place.

[Additional info]

This revert necessitates a re-spin for focal/linux-azure and bionic/linux-azure-5.4
for sru-2021.09.27.

I will attempt to get this patch reverted from upstream stable until such time as
a proper fix is developed. Failing that I'll propose revert patches for the affected
master kernels.

SF: #1940564

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