linux-kernel - Suspend/Resume Broken on AM43/AM33 Platforms

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Date:   Mon, 19 Aug 2019 09:54:58 +0530
From:   Keerthy <j-keerthy@...com>
To:     <swboyd@...omium.org>, Tony Lindgren <tony@...mide.com>,
        <herbert@...dor.apana.org.au>
CC:     Linux-OMAP <linux-omap@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Kristo, Tero" <t-kristo@...com>, Dave Gerlach <d-gerlach@...com>
Subject: Suspend/Resume Broken on AM43/AM33 Platforms

Hi Stephen,

commit 03a3bb7ae63150230c5de645dc95e673ebf17e1a
Author: Stephen Boyd <swboyd@...omium.org>
Date:   Mon Aug 5 16:32:41 2019 -0700

     hwrng: core - Freeze khwrng thread during suspend

Commit seems to be breaking suspend/resume on TI AM43/AM33 platforms.


rtcwake: wakeup from "mem" using /dev/rtc0 at Sun Nov 18 02:12:12 2018
[   54.033833] PM: suspend entry (deep)
[   54.037741] Filesystems sync: 0.000 seconds
[   54.062730] Freezing user space processes ... (elapsed 0.001 seconds) 
done.
[   54.071313] OOM killer disabled.
[   54.074572] Freezing remaining freezable tasks ...
[   74.083121] Freezing of tasks failed after 20.003 seconds (1 tasks 
refusing to freeze, wq_busy=0):
[   74.092257] hwrng           R  running task        0   289      2 
0x00000020
[   74.099511] [<c08c64c4>] (__schedule) from [<c08c6a10>] 
(schedule+0x3c/0xc0)
[   74.106720] [<c08c6a10>] (schedule) from [<c05dbd8c>] 
(add_hwgenerator_randomness+0xb0/0x100)
[   74.115358] [<c05dbd8c>] (add_hwgenerator_randomness) from 
[<bf1803c8>] (hwrng_fillfn+0xc0/0x14c [rng_core])
[   74.125356] [<bf1803c8>] (hwrng_fillfn [rng_core]) from [<c015abec>] 
(kthread+0x134/0x148)
[   74.133764] [<c015abec>] (kthread) from [<c01010e8>] 
(ret_from_fork+0x14/0x2c)
[   74.141093] Exception stack(0xec611fb0 to 0xec611ff8)
[   74.146239] 1fa0:                                     00000000 
00000000 00000000 00000000
[   74.154478] 1fc0: 00000000 00000000 00000000 00000000 00000000 
00000000 00000000 00000000
[   74.162764] 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[   74.169499] Restarting kernel threads ... done.
[   74.175628] OOM killer enabled.
[   74.178796] Restarting tasks ... done.
[   74.226769] PM: suspend exit
rtcwake: write error
1

One task refusing to freeze is the final error i am seeing.

- Keerthy