[wireless,v2,4/4] wifi: b43: Disable QoS for bcm4331

bcm4331 seems to not function correctly with QoS support. This may be due
to issues with currently available firmware or potentially a device
specific issue.

When queues that are not of the default "best effort" priority are
selected, traffic appears to not transmit out of the hardware while no
errors are returned. This behavior is present among all the other priority
queues: video, voice, and background. While this can be worked around by
setting a kernel parameter, the default behavior is problematic for most
users and may be difficult to debug. This patch offers a working out-of-box
experience for bcm4331 users.

Log of the issue (using ssh low-priority traffic as an example):
    ssh -T -vvvv git@github.com
    OpenSSH_9.6p1, OpenSSL 3.0.12 24 Oct 2023
    debug1: Reading configuration data /etc/ssh/ssh_config
    debug2: checking match for 'host * exec "/nix/store/q1c2flcykgr4wwg5a6h450hxbk4ch589-bash-5.2-p15/bin/bash -c '/nix/store/c015armnkhr6v18za0rypm7sh1i8js8w-gnupg-2.4.1/bin/gpg-connect-agent --quiet updatestartuptty /bye >/dev/null 2>&1'"' host github.com originally github.com
    debug3: /etc/ssh/ssh_config line 5: matched 'host "github.com"'
    debug1: Executing command: '/nix/store/q1c2flcykgr4wwg5a6h450hxbk4ch589-bash-5.2-p15/bin/bash -c '/nix/store/c015armnkhr6v18za0rypm7sh1i8js8w-gnupg-2.4.1/bin/gpg-connect-agent --quiet updatestartuptty /bye >/dev/null 2>&1''
    debug3: command returned status 0
    debug3: /etc/ssh/ssh_config line 5: matched 'exec "/nix/store/q1c2flcykgr4wwg5a6h450hxbk4ch589-bash-5.2-p15/bin/bash -c '/nix/store/c015armnkhr6v18za0r"'
    debug2: match found
    debug1: /etc/ssh/ssh_config line 9: Applying options for *
    debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> '/home/binary-eater/.ssh/known_hosts'
    debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> '/home/binary-eater/.ssh/known_hosts2'
    debug2: resolving "github.com" port 22
    debug3: resolve_host: lookup github.com:22
    debug3: channel_clear_timeouts: clearing
    debug3: ssh_connect_direct: entering
    debug1: Connecting to github.com [192.30.255.113] port 22.
    debug3: set_sock_tos: set socket 3 IP_TOS 0x48

Fixes: e6f5b934fba8 ("b43: Add QOS support")
Signed-off-by: Rahul Rameshbabu <sergeantsagara@protonmail.com>
---

Notes:
    Changes:
    
        v1->v2:
            - Simplified logic to solely just disable QoS for
              bcm4331 (suggested by Michael Büsch <m@bues.ch>)

 drivers/net/wireless/broadcom/b43/main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Hi Rahul,

On Sun, Dec 31, 2023 at 4:04 PM Rahul Rameshbabu
<sergeantsagara@protonmail.com> wrote:
>
> bcm4331 seems to not function correctly with QoS support. This may be due
> to issues with currently available firmware or potentially a device
> specific issue.
>
> When queues that are not of the default "best effort" priority are
> selected, traffic appears to not transmit out of the hardware while no
> errors are returned. This behavior is present among all the other priority
> queues: video, voice, and background. While this can be worked around by
> setting a kernel parameter, the default behavior is problematic for most
> users and may be difficult to debug. This patch offers a working out-of-box
> experience for bcm4331 users.
>
> [snip]
>
> Fixes: e6f5b934fba8 ("b43: Add QOS support")
> Signed-off-by: Rahul Rameshbabu <sergeantsagara@protonmail.com>

LGTM

Reviewed-by: Julian Calaby <julian.calaby@gmail.com>

Thanks,