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27 March 2024, 02:37:15 UTC
Revision 15266ae38fe09dae07bd8812cb7a7717b1e1d992 authored by Lyude Paul on 12 January 2017, 02:25:24 UTC, committed by Dave Airlie on 27 January 2017, 00:50:35 UTC 
drm/nouveau: Handle fbcon suspend/resume in seperate worker
 
Resuming from RPM can happen while already holding
dev->mode_config.mutex. This means we can't actually handle fbcon in
any RPM resume workers, since restoring fbcon requires grabbing
dev->mode_config.mutex again. So move the fbcon suspend/resume code into
it's own worker, and rely on that instead to avoid deadlocking.

This fixes more deadlocks for runtime suspending the GPU on the ThinkPad
W541. Reproduction recipe:

 - Get a machine with both optimus and a nvidia card with connectors
   attached to it
 - Wait for the nvidia GPU to suspend
 - Attempt to manually reprobe any of the connectors on the nvidia GPU
   using sysfs
 - *deadlock*

[airlied: use READ_ONCE to address Hans's comment]

Signed-off-by: Lyude <lyude@redhat.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Kilian Singer <kilian.singer@quantumtechnology.info>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: David Airlie <airlied@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
1 parent cae9ff0
History
Tip revision: 15266ae38fe09dae07bd8812cb7a7717b1e1d992 authored by Lyude Paul on 12 January 2017, 02:25:24 UTC
drm/nouveau: Handle fbcon suspend/resume in seperate worker
Tip revision: 15266ae
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.cocciconfig -rw-r--r-- 59 bytes
.get_maintainer.ignore -rw-r--r-- 31 bytes
.gitattributes -rw-r--r-- 30 bytes
.gitignore -rw-r--r-- 1.3 KB
.mailmap -rw-r--r-- 7.7 KB
COPYING -rw-r--r-- 18.3 KB
CREDITS -rw-r--r-- 96.0 KB
Kbuild -rw-r--r-- 2.8 KB
Kconfig -rw-r--r-- 252 bytes
MAINTAINERS -rw-r--r-- 383.0 KB
Makefile -rw-r--r-- 57.6 KB
README -rw-r--r-- 722 bytes

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