Re: FAILED: patch "[PATCH] iwlwifi: mvm: limit maximum queue appropriately" failed to apply to 4.19-stable tree

[Sasha Levin <sashal@kernel.org>]

On Mon, Apr 27, 2020 at 05:58:12PM +0200, gregkh@linuxfoundation.org wrote:
>
>The patch below does not apply to the 4.19-stable tree.
>If someone wants it applied there, or to any other stable or longterm
>tree, then please email the backport, including the original git commit
>id to <stable@vger.kernel.org>.
>
>thanks,
>
>greg k-h
>
>------------------ original commit in Linus's tree ------------------
>
>From e5b72e3bc4763152e24bf4b8333bae21cc526c56 Mon Sep 17 00:00:00 2001
>From: Johannes Berg <johannes.berg@intel.com>
>Date: Fri, 17 Apr 2020 10:08:12 +0300
>Subject: [PATCH] iwlwifi: mvm: limit maximum queue appropriately
>
>Due to some hardware issues, queue 31 isn't usable on devices that have
>32 queues (7000, 8000, 9000 families), which is correctly reflected in
>the configuration and TX queue initialization.
>
>However, the firmware API and queue allocation code assumes that there
>are 32 queues, and if something actually attempts to use #31 this leads
>to a NULL-pointer dereference since it's not allocated.
>
>Fix this by limiting to 31 in the IWL_MVM_DQA_MAX_DATA_QUEUE, and also
>add some code to catch this earlier in the future, if the configuration
>changes perhaps.
>
>Cc: stable@vger.kernel.org # v4.9+
>Signed-off-by: Johannes Berg <johannes.berg@intel.com>
>Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
>Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
>Link: https://lore.kernel.org/r/iwlwifi.20200417100405.98a79be2db6a.I3a4af6b03b87a6bc18db9b1ff9a812f397bee1fc@changeid

iwl_mvm_find_free_queue() lives in a different file. Fixed and queued up
for 4.9+.

-- 
Thanks,
Sasha