releases/4.14.67/brcmfmac-stop-watchdog-before-detach-and-free-everything.patch

   1 From foo@baz Wed Aug 22 09:33:46 CEST 2018
   2 From: Michael Trimarchi <michael@amarulasolutions.com>
   3 Date: Wed, 30 May 2018 11:06:34 +0200
   4 Subject: brcmfmac: stop watchdog before detach and free everything
   5
   6 From: Michael Trimarchi <michael@amarulasolutions.com>
   7
   8 [ Upstream commit 373c83a801f15b1e3d02d855fad89112bd4ccbe0 ]
   9
  10 Using built-in in kernel image without a firmware in filesystem
  11 or in the kernel image can lead to a kernel NULL pointer deference.
  12 Watchdog need to be stopped in brcmf_sdio_remove
  13
  14 The system is going down NOW!
  15 [ 1348.110759] Unable to handle kernel NULL pointer dereference at virtual address 000002f8
  16 Sent SIGTERM to all processes
  17 [ 1348.121412] Mem abort info:
  18 [ 1348.126962]   ESR = 0x96000004
  19 [ 1348.130023]   Exception class = DABT (current EL), IL = 32 bits
  20 [ 1348.135948]   SET = 0, FnV = 0
  21 [ 1348.138997]   EA = 0, S1PTW = 0
  22 [ 1348.142154] Data abort info:
  23 [ 1348.145045]   ISV = 0, ISS = 0x00000004
  24 [ 1348.148884]   CM = 0, WnR = 0
  25 [ 1348.151861] user pgtable: 4k pages, 48-bit VAs, pgdp = (____ptrval____)
  26 [ 1348.158475] [00000000000002f8] pgd=0000000000000000
  27 [ 1348.163364] Internal error: Oops: 96000004 [#1] PREEMPT SMP
  28 [ 1348.168927] Modules linked in: ipv6
  29 [ 1348.172421] CPU: 3 PID: 1421 Comm: brcmf_wdog/mmc0 Not tainted 4.17.0-rc5-next-20180517 #18
  30 [ 1348.180757] Hardware name: Amarula A64-Relic (DT)
  31 [ 1348.185455] pstate: 60000005 (nZCv daif -PAN -UAO)
  32 [ 1348.190251] pc : brcmf_sdiod_freezer_count+0x0/0x20
  33 [ 1348.195124] lr : brcmf_sdio_watchdog_thread+0x64/0x290
  34 [ 1348.200253] sp : ffff00000b85be30
  35 [ 1348.203561] x29: ffff00000b85be30 x28: 0000000000000000
  36 [ 1348.208868] x27: ffff00000b6cb918 x26: ffff80003b990638
  37 [ 1348.214176] x25: ffff0000087b1a20 x24: ffff80003b94f800
  38 [ 1348.219483] x23: ffff000008e620c8 x22: ffff000008f0b660
  39 [ 1348.224790] x21: ffff000008c6a858 x20: 00000000fffffe00
  40 [ 1348.230097] x19: ffff80003b94f800 x18: 0000000000000001
  41 [ 1348.235404] x17: 0000ffffab2e8a74 x16: ffff0000080d7de8
  42 [ 1348.240711] x15: 0000000000000000 x14: 0000000000000400
  43 [ 1348.246018] x13: 0000000000000400 x12: 0000000000000001
  44 [ 1348.251324] x11: 00000000000002c4 x10: 0000000000000a10
  45 [ 1348.256631] x9 : ffff00000b85bc40 x8 : ffff80003be11870
  46 [ 1348.261937] x7 : ffff80003dfc7308 x6 : 000000078ff08b55
  47 [ 1348.267243] x5 : 00000139e1058400 x4 : 0000000000000000
  48 [ 1348.272550] x3 : dead000000000100 x2 : 958f2788d6618100
  49 [ 1348.277856] x1 : 00000000fffffe00 x0 : 0000000000000000
  50
  51 Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
  52 Acked-by: Arend van Spriel <arend.vanspriel@broadcom.com>
  53 Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
  54 Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
  55 Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
  56 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  57 ---
  58  drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c |    7 +++++++
  59  1 file changed, 7 insertions(+)
  60
  61 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
  62 +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
  63 @@ -4245,6 +4245,13 @@ void brcmf_sdio_remove(struct brcmf_sdio
  64         brcmf_dbg(TRACE, "Enter\n");
  65
  66         if (bus) {
  67 +               /* Stop watchdog task */
  68 +               if (bus->watchdog_tsk) {
  69 +                       send_sig(SIGTERM, bus->watchdog_tsk, 1);
  70 +                       kthread_stop(bus->watchdog_tsk);
  71 +                       bus->watchdog_tsk = NULL;
  72 +               }
  73 +
  74                 /* De-register interrupt handler */
  75                 brcmf_sdiod_intr_unregister(bus->sdiodev);
  76