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Message-id: <546B2508.8070409@samsung.com>
Date: Tue, 18 Nov 2014 19:52:56 +0900
From: Inki Dae <inki.dae@...sung.com>
To: Andrzej Hajda <a.hajda@...sung.com>
Cc: linux-samsung-soc@...r.kernel.org, dri-devel@...ts.freedesktop.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [BUG] blocked task after exynos_drm_init
On 2014년 11월 18일 19:42, Andrzej Hajda wrote:
> On 11/06/2014 10:06 AM, Krzysztof Kozlowski wrote:
>> Hi,
>>
>> On last next (next-20141104, next-20141105) booting locks after
>> initializing Exynos DRM (Trats2 board):
>>
>> [ 2.028283] [drm] Initialized drm 1.1.0 20060810
>> [ 240.505795] INFO: task swapper/0:1 blocked for more than 120 seconds.
>> [ 240.510825] Not tainted 3.18.0-rc3-next-20141105 #794
>> [ 240.516418] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>> [ 240.524173] swapper/0 D c052534c 0 1 0 0x00000000
>> [ 240.530527] [<c052534c>] (__schedule) from [<c0525b34>] (schedule_preempt_disabled+0x14/0x20)
>> [ 240.539030] [<c0525b34>] (schedule_preempt_disabled) from [<c0526d44>] (mutex_lock_nested+0x1c4/0x464)
>> [ 240.548320] [<c0526d44>] (mutex_lock_nested) from [<c02be908>] (__driver_attach+0x48/0x98)
>> [ 240.556562] [<c02be908>] (__driver_attach) from [<c02bcc00>] (bus_for_each_dev+0x54/0x88)
>> [ 240.564717] [<c02bcc00>] (bus_for_each_dev) from [<c02bdce0>] (bus_add_driver+0xe4/0x200)
>> [ 240.572876] [<c02bdce0>] (bus_add_driver) from [<c02bef94>] (driver_register+0x78/0xf4)
>> [ 240.580864] [<c02bef94>] (driver_register) from [<c029e99c>] (exynos_drm_platform_probe+0x34/0x234)
>> [ 240.589890] [<c029e99c>] (exynos_drm_platform_probe) from [<c02bfcf0>] (platform_drv_probe+0x48/0xa4)
>> [ 240.599090] [<c02bfcf0>] (platform_drv_probe) from [<c02be680>] (driver_probe_device+0x13c/0x37c)
>> [ 240.607940] [<c02be680>] (driver_probe_device) from [<c02be954>] (__driver_attach+0x94/0x98)
>> [ 240.616360] [<c02be954>] (__driver_attach) from [<c02bcc00>] (bus_for_each_dev+0x54/0x88)
>> [ 240.624517] [<c02bcc00>] (bus_for_each_dev) from [<c02bdce0>] (bus_add_driver+0xe4/0x200)
>> [ 240.632679] [<c02bdce0>] (bus_add_driver) from [<c02bef94>] (driver_register+0x78/0xf4)
>> [ 240.640667] [<c02bef94>] (driver_register) from [<c029e938>] (exynos_drm_init+0x70/0xa0)
>> [ 240.648739] [<c029e938>] (exynos_drm_init) from [<c00089b0>] (do_one_initcall+0xac/0x1f0)
>> [ 240.656914] [<c00089b0>] (do_one_initcall) from [<c074bd90>] (kernel_init_freeable+0x10c/0x1d8)
>> [ 240.665591] [<c074bd90>] (kernel_init_freeable) from [<c051eabc>] (kernel_init+0x8/0xec)
>> [ 240.673661] [<c051eabc>] (kernel_init) from [<c000f268>] (ret_from_fork+0x14/0x2c)
>> [ 240.681196] 3 locks held by swapper/0/1:
>> [ 240.685091] #0: (&dev->mutex){......}, at: [<c02be908>] __driver_attach+0x48/0x98
>> [ 240.692732] #1: (&dev->mutex){......}, at: [<c02be918>] __driver_attach+0x58/0x98
>> [ 240.700367] #2: (&dev->mutex){......}, at: [<c02be908>] __driver_attach+0x48/0x98
>
>
> This is caused by patch moving platform devices to
> /sys/devices/platform[1]. Since this patch registering platform
> drivers/devices in probe of platform device causes deadlocks. I guess
> now all driver registration should be moved to exynos_drm_init and it
> seems better location for it IMHO.
Thanks. It might be a chance that we could separate sub drivers of
Exynos drm into independent modules so that they can be called
independently because if we move them to exynos_drm_init then the
deferred probe wouldn't work correctly.
Thanks,
Inki Dae
>
> Regards
> Andrzej
>
> [1]: http://www.spinics.net/lists/devicetree/msg56101.html
>
>
>
>>
>> Full dmesg and config attached.
>>
>> Best regards,
>> Krzysztof
>>
>>
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@...ts.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/dri-devel
>>
>
>
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