drm/nouveau: Don't enabling polling twice on runtime resume

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As it turns out, on cards that actually have CRTCs on them we're already
calling drm_kms_helper_poll_enable(drm_dev) from
nouveau_display_resume() before we call it in
nouveau_pmops_runtime_resume(). This leads us to accidentally trying to
enable polling twice, which results in a potential deadlock between the
RPM locks and drm_dev->mode_config.mutex if we end up trying to enable
polling the second time while output_poll_execute is running and holding
the mode_config lock. As such, make sure we only enable polling in
nouveau_pmops_runtime_resume() if we need to.

This fixes hangs observed on the ThinkPad W541

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>

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This commit is contained in:

Lyude Paul 2017-01-11 21:25:23 -05:00 • committed by Dave Airlie

parent 6c971c09f3

commit cae9ff036e

2 changed files with 6 additions and 2 deletions

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3

drivers/gpu/drm/nouveau/nouveau_display.c

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5

drivers/gpu/drm/nouveau/nouveau_drm.c

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