linux-kernel - Re: [PATCH 1/2] mwifiex: fix mwifiex_shutdown

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Message-ID: <87pn4o5bkk.fsf@tynnyri.adurom.net>
Date:   Sun, 08 Nov 2020 13:31:55 +0200
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Tsuchiya Yuto <kitakar@...il.com>
Cc:     Amitkumar Karwar <amitkarwar@...il.com>,
        Ganapathi Bhat <ganapathi.bhat@....com>,
        Xinming Hu <huxinming820@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Maximilian Luz <luzmaximilian@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...el.com>, verdre@...d.nl
Subject: Re: [PATCH 1/2] mwifiex: fix mwifiex_shutdown_sw() causing sw reset failure

Tsuchiya Yuto <kitakar@...il.com> writes:

> When FLR is performed but without fw reset for some reasons (e.g. on
> Surface devices, fw reset requires another quirk), it fails to reset
> properly. You can trigger the issue on such devices via debugfs entry
> for reset:
>
>     $ echo 1 | sudo tee /sys/kernel/debug/mwifiex/mlan0/reset
>
> and the resulting dmesg log:
>
>     [   45.740508] mwifiex_pcie 0000:03:00.0: Resetting per request
>     [   45.742937] mwifiex_pcie 0000:03:00.0: info: successfully disconnected from [BSSID]: reason code 3
>     [   45.744666] mwifiex_pcie 0000:03:00.0: info: shutdown mwifiex...
>     [   45.751530] mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
>     [   45.751539] mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
>     [   45.771691] mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
>     [   45.771695] mwifiex_pcie 0000:03:00.0: deleting the crypto keys
>     [   45.771697] mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
>     [   45.771698] mwifiex_pcie 0000:03:00.0: deleting the crypto keys
>     [   45.771699] mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
>     [   45.771701] mwifiex_pcie 0000:03:00.0: deleting the crypto keys
>     [   45.771702] mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
>     [   45.771703] mwifiex_pcie 0000:03:00.0: deleting the crypto keys
>     [   45.771704] mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
>     [   45.771705] mwifiex_pcie 0000:03:00.0: deleting the crypto keys
>     [   45.771707] mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
>     [   45.771708] mwifiex_pcie 0000:03:00.0: deleting the crypto keys
>     [   53.099343] mwifiex_pcie 0000:03:00.0: info: trying to associate to '[SSID]' bssid [BSSID]
>     [   53.241870] mwifiex_pcie 0000:03:00.0: info: associated to bssid [BSSID] successfully
>     [   75.377942] mwifiex_pcie 0000:03:00.0: cmd_wait_q terminated: -110
>     [   85.385491] mwifiex_pcie 0000:03:00.0: info: successfully disconnected from [BSSID]: reason code 15
>     [   87.539408] mwifiex_pcie 0000:03:00.0: cmd_wait_q terminated: -110
>     [   87.539412] mwifiex_pcie 0000:03:00.0: deleting the crypto keys
>     [   99.699917] mwifiex_pcie 0000:03:00.0: cmd_wait_q terminated: -110
>     [   99.699925] mwifiex_pcie 0000:03:00.0: deleting the crypto keys
>     [  111.859802] mwifiex_pcie 0000:03:00.0: cmd_wait_q terminated: -110
>     [  111.859808] mwifiex_pcie 0000:03:00.0: deleting the crypto keys
>     [...]
>
> When comparing mwifiex_shutdown_sw() with mwifiex_pcie_remove(), it
> lacks mwifiex_init_shutdown_fw().
>
> This commit fixes mwifiex_shutdown_sw() by adding the missing
> mwifiex_init_shutdown_fw().
>
> Fixes: 4c5dae59d2e9 ("mwifiex: add PCIe function level reset support")
> Signed-off-by: Tsuchiya Yuto <kitakar@...il.com>

Otherwise looks good to me, but what is FLR? I can add the description
to the commit log if you tell me what it is.

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