netdev - Stable request: iwlwifi: mvm: don't send RFH_QUEUE_CONFIG

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Message-ID: <CAKf6xpueeG-c+XV6gYu_H_DXNkR11+_v54hgv=vukuy+Tcb+LQ@mail.gmail.com>
Date:   Sun, 7 Feb 2021 09:19:07 -0500
From:   Jason Andryuk <jandryuk@...il.com>
To:     stable@...r.kernel.org, Luca Coelho <luciano.coelho@...el.com>,
        Kalle Valo <kvalo@...eaurora.org>
Cc:     netdev@...r.kernel.org
Subject: Stable request: iwlwifi: mvm: don't send RFH_QUEUE_CONFIG_CMD with no queues

Hi,

commit 64f55156f7adedb1ac5bb9cdbcbc9ac05ff5a724 upstream

The requested patch allows the iwlwifi driver to work with newer AX200
wifi cards when MSI-X interrupts are not available.  Without it,
bringing an interface "up" fails with a Microcode SW error.  Xen PCI
passthrough with a linux stubdom doesn't enable MSI-X which triggers
this condition.

I think it's only applicable to 5.4 because it's in 5.10 and earlier
kernels don't have AX200 support.

I'm making this request to stable and CC-ing netdev since I saw a
message [1] on netdev saying:
"""
We're actually experimenting with letting Greg take networking patches
into stable like he does for every other tree. If the patch doesn't
appear in the next stable release please poke stable@ directly.
"""

Thanks,
Jason

[1] https://lore.kernel.org/netdev/20210129193030.46ef3b17@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com/