From: Tom Cherry <tomcherry@google.com>
To: Greg Hackmann <ghackmann@google.com>
Cc: devel@driverdev.osuosl.org, daniels@collabora.com,
linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
"Daniel Vetter" <daniel.vetter@ffwll.ch>,
"Maarten Lankhorst" <maarten.lankhorst@canonical.com>,
"Arve Hjønnevåg" <arve@android.com>,
"Dmitry Torokhov" <dtor@google.com>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Riley Andrews" <riandrews@android.com>,
"Gustavo Padovan" <gustavo.padovan@collabora.co.uk>,
"John Harrison" <John.C.Harrison@intel.com>
Subject: Re: [RFC 26/29] dma-buf/fence: remove pointless fence_timeline_signal at destroy phase
Date: Tue, 9 Feb 2016 14:55:29 -0800 [thread overview]
Message-ID: <CAPc65azJ_u_ZtEB6hs3=MXr1sGdS5pUzzDV0sQ8f-S0gSzkx7Q@mail.gmail.com> (raw)
In-Reply-To: <569983CC.7000207@google.com>
On Fri, Jan 15, 2016 at 3:42 PM, Greg Hackmann <ghackmann@google.com> wrote:
> On 01/15/2016 10:02 AM, Gustavo Padovan wrote:
>>
>> Patches 27 and 28 are attempt to fix that. I assumed that if some code is
>> calling fence_timeline_destroy() it wants to stop everything so I
>> worked on a solution that stops any waiter and allows the timeline to be
>> destroyed.
>>
>> No one is using fence_timeline_destroy() in mainline now, so it is
>> definately a behaviour we can discuss.
>>
>> Gustavo
>>
>
> +Tom Cherry and Dmitry Torokhov recently discovered that this was broken by
> the refactoring of Android sync on top of dma-buf fences.
>
> Tom and Dmitry, did you send the proposed fix upstream?
There was a similar issue that I had originally thought to be related
to fence_timeline_destroy() but was actually related to
sync_fence_free(). Dmitry sent the patch upstream at
https://lkml.org/lkml/2015/12/14/953, but it does not look like it has
received any feedback.
We saw real panics without this patch. I didn't see this patch or any
similar changes in the destaging commits, and I would recommend it be
looked at while destaging this driver.
Tom
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next prev parent reply other threads:[~2016-02-09 22:55 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-15 14:55 [RFC 00/29] De-stage android's sync framework Gustavo Padovan
2016-01-15 14:55 ` [RFC 01/29] staging/android: fix sync framework documentation Gustavo Padovan
2016-01-15 14:55 ` [RFC 02/29] staging/android: fix checkpatch warning Gustavo Padovan
2016-01-15 14:55 ` [RFC 03/29] staging/android: rename sync_fence_release Gustavo Padovan
2016-01-15 14:55 ` [RFC 04/29] staging/android: rename 'android_fence' to 'sync_fence' Gustavo Padovan
2016-01-15 14:55 ` [RFC 05/29] staging/android: remove not used sync_timeline ops Gustavo Padovan
2016-01-15 14:55 ` [RFC 06/29] staging/android: create a 'sync' dir for debugfs information Gustavo Padovan
2016-01-15 14:55 ` [RFC 07/29] staging/android: move sw_sync file to debugfs file Gustavo Padovan
2016-01-15 14:55 ` [RFC 08/29] staging/android: Remove WARN_ON_ONCE when releasing sync_fence Gustavo Padovan
2016-01-15 14:55 ` [RFC 09/29] staging/android: rename struct sync_fence's variables to 'sync_fence' Gustavo Padovan
2016-01-15 14:55 ` [RFC 10/29] staging/android: rename 'sync_pt' to 'fence' in struct sync_fence_cb Gustavo Padovan
2016-01-15 14:55 ` [RFC 11/29] dma-buf/fence: move sync_timeline to fence_timeline Gustavo Padovan
2016-01-20 0:56 ` Greg Hackmann
2016-01-15 14:55 ` [RFC 12/29] staging/android: remove struct sync_pt Gustavo Padovan
2016-01-15 14:55 ` [RFC 13/29] dma-buf/fence: create fence_default_enable_signaling() Gustavo Padovan
2016-01-15 14:55 ` [RFC 14/29] dma-buf/fence: create fence_default_release() Gustavo Padovan
2016-01-15 14:55 ` [RFC 15/29] dma-buf/fence: create fence_default_get_driver_name() Gustavo Padovan
2016-01-15 14:55 ` [RFC 16/29] dma-buf/fence: create fence_default_timeline_name() Gustavo Padovan
2016-01-15 14:55 ` [RFC 17/29] dma-buf/fence: store last signaled value on fence timeline Gustavo Padovan
2016-01-15 14:55 ` [RFC 18/29] dma-buf/fence: create default .fence_value_str() and .timeline_value_str() Gustavo Padovan
2016-01-15 14:55 ` [RFC 19/29] dma-buf/fence: create fence_default_fill_driver_data() Gustavo Padovan
2016-01-15 14:55 ` [RFC 20/29] dma-buf/fence: remove fence_timeline_ops Gustavo Padovan
2016-01-15 14:55 ` [RFC 21/29] dma-buf/fence: add fence_create_on_timeline() Gustavo Padovan
2016-01-15 14:55 ` [RFC 22/29] staging/android: remove sync_pt_create() Gustavo Padovan
2016-01-15 14:55 ` [RFC 23/29] staging/android: remove sw_sync_timeline and sw_sync_pt Gustavo Padovan
2016-01-15 14:55 ` [RFC 24/29] dma-buf/fence: add debug to fence timeline Gustavo Padovan
2016-01-15 14:55 ` [RFC 25/29] dma-buf/fence: remove unused var from fence_timeline_signal() Gustavo Padovan
2016-01-15 14:55 ` [RFC 26/29] dma-buf/fence: remove pointless fence_timeline_signal at destroy phase Gustavo Padovan
2016-01-15 17:48 ` John Harrison
2016-01-15 18:02 ` Gustavo Padovan
2016-01-15 23:42 ` Greg Hackmann
2016-02-09 22:55 ` Tom Cherry [this message]
2016-02-25 15:26 ` Gustavo Padovan
2016-01-15 14:55 ` [RFC 27/29] dma-buf/fence: add .cleanup() callback Gustavo Padovan
2016-01-15 14:55 ` [RFC 28/29] staging/android: use .cleanup() to interrupt any sync_fence waiter Gustavo Padovan
2016-01-15 14:55 ` [RFC 29/29] dma-buf/fence: de-stage sync framework Gustavo Padovan
2016-01-15 19:11 ` [RFC 00/29] De-stage android's " Joe Perches
2016-01-19 11:00 ` Daniel Vetter
2016-01-19 15:23 ` Gustavo Padovan
2016-01-19 16:12 ` John Harrison
2016-01-19 17:52 ` Gustavo Padovan
2016-01-19 18:04 ` Daniel Vetter
2016-01-19 18:15 ` Gustavo Padovan
2016-03-23 15:07 ` Tomeu Vizoso
2016-01-19 20:10 ` Gustavo Padovan
2016-01-19 20:32 ` Daniel Vetter
2016-01-20 10:28 ` Maarten Lankhorst
2016-01-20 14:32 ` Gustavo Padovan
2016-01-20 15:02 ` Maarten Lankhorst
2016-01-20 16:29 ` Daniel Vetter
2016-01-20 18:28 ` Gustavo Padovan
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