linux-kernel - Re: [PATCH V2] brcmfmac: stop watchdog before detach and free everything

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Message-ID: <CAHp75VdhkN5_9wr_3evGvi67FXhrJA+zSSLKViqr-_7_fNti=A@mail.gmail.com>
Date:   Tue, 19 Jun 2018 22:37:42 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Arend van Spriel <arend.vanspriel@...adcom.com>
Cc:     Kalle Valo <kvalo@...eaurora.org>,
        Michael Trimarchi <michael@...rulasolutions.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Chi-Hsien Lin <chi-hsien.lin@...ress.com>,
        Wright Feng <wright.feng@...ress.com>,
        "David S. Miller" <davem@...emloft.net>,
        Pieter-Paul Giesberts <pieter-paul.giesberts@...adcom.com>,
        Ian Molton <ian@...menth.co.uk>,
        "open list:TI WILINK WIRELES..." <linux-wireless@...r.kernel.org>,
        "open list:BROADCOM BRCM80211 IEEE802.11n WIRELESS DRIVER" 
        <brcm80211-dev-list.pdl@...adcom.com>,
        brcm80211-dev-list@...ress.com, netdev <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2] brcmfmac: stop watchdog before detach and free everything

On Tue, Jun 19, 2018 at 10:27 PM, Arend van Spriel
<arend.vanspriel@...adcom.com> wrote:
> On 6/19/2018 9:06 PM, Kalle Valo wrote:
>>
>> Arend van Spriel <arend.vanspriel@...adcom.com> writes:
>>
>>> On 5/30/2018 11:06 AM, Michael Trimarchi wrote:
>>>>
>>>> Using built-in in kernel image without a firmware in filesystem
>>>> or in the kernel image can lead to a kernel NULL pointer deference.
>>>> Watchdog need to be stopped in brcmf_sdio_remove
>>>>
>>>> The system is going down NOW!
>>>> [ 1348.110759] Unable to handle kernel NULL pointer dereference at
>>>> virtual address 000002f8
>>>> Sent SIGTERM to all processes
>>>> [ 1348.121412] Mem abort info:
>>>> [ 1348.126962]   ESR = 0x96000004
>>>> [ 1348.130023]   Exception class = DABT (current EL), IL = 32 bits
>>>> [ 1348.135948]   SET = 0, FnV = 0
>>>> [ 1348.138997]   EA = 0, S1PTW = 0
>>>> [ 1348.142154] Data abort info:
>>>> [ 1348.145045]   ISV = 0, ISS = 0x00000004
>>>> [ 1348.148884]   CM = 0, WnR = 0
>>>> [ 1348.151861] user pgtable: 4k pages, 48-bit VAs, pgdp =
>>>> (____ptrval____)
>>>> [ 1348.158475] [00000000000002f8] pgd=0000000000000000
>>>> [ 1348.163364] Internal error: Oops: 96000004 [#1] PREEMPT SMP
>>>> [ 1348.168927] Modules linked in: ipv6
>>>> [ 1348.172421] CPU: 3 PID: 1421 Comm: brcmf_wdog/mmc0 Not tainted
>>>> 4.17.0-rc5-next-20180517 #18
>>>> [ 1348.180757] Hardware name: Amarula A64-Relic (DT)
>>>> [ 1348.185455] pstate: 60000005 (nZCv daif -PAN -UAO)
>>>> [ 1348.190251] pc : brcmf_sdiod_freezer_count+0x0/0x20
>>>> [ 1348.195124] lr : brcmf_sdio_watchdog_thread+0x64/0x290
>>>> [ 1348.200253] sp : ffff00000b85be30
>>>> [ 1348.203561] x29: ffff00000b85be30 x28: 0000000000000000
>>>> [ 1348.208868] x27: ffff00000b6cb918 x26: ffff80003b990638
>>>> [ 1348.214176] x25: ffff0000087b1a20 x24: ffff80003b94f800
>>>> [ 1348.219483] x23: ffff000008e620c8 x22: ffff000008f0b660
>>>> [ 1348.224790] x21: ffff000008c6a858 x20: 00000000fffffe00
>>>> [ 1348.230097] x19: ffff80003b94f800 x18: 0000000000000001
>>>> [ 1348.235404] x17: 0000ffffab2e8a74 x16: ffff0000080d7de8
>>>> [ 1348.240711] x15: 0000000000000000 x14: 0000000000000400
>>>> [ 1348.246018] x13: 0000000000000400 x12: 0000000000000001
>>>> [ 1348.251324] x11: 00000000000002c4 x10: 0000000000000a10
>>>> [ 1348.256631] x9 : ffff00000b85bc40 x8 : ffff80003be11870
>>>> [ 1348.261937] x7 : ffff80003dfc7308 x6 : 000000078ff08b55
>>>> [ 1348.267243] x5 : 00000139e1058400 x4 : 0000000000000000
>>>> [ 1348.272550] x3 : dead000000000100 x2 : 958f2788d6618100
>>>> [ 1348.277856] x1 : 00000000fffffe00 x0 : 0000000000000000
>>>
>>>
>>> Forgot about this one.
>>>
>>> Acked-by: Arend van Spriel <arend.vanspriel@...adcom.com>
>>
>>
>> Should this go to 4.18?
>
>
> It is a bit of a corner case, but yeah let's do that.
>
> Regards,
> Arend

Guys, sorry, didn't have time to test. Do it ASAP.

-- 
With Best Regards,
Andy Shevchenko