4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Lyude Paul <lyude@xxxxxxxxxx>
[ Upstream commit cae9ff036eea577856d5b12860b4c79c5e71db4a ]
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@xxxxxxxxxx>
Cc: Hans de Goede <hdegoede@xxxxxxxxxx>
Cc: Kilian Singer <kilian.singer@xxxxxxxxxxxxxxxxxxxxxx>
Cc: Lukas Wunner <lukas@xxxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/nouveau/nouveau_display.c | 3 ++-
drivers/gpu/drm/nouveau/nouveau_drm.c | 5 ++++-
2 files changed, 6 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -370,7 +370,8 @@ nouveau_display_init(struct drm_device *
return ret;
/* enable polling for external displays */
- drm_kms_helper_poll_enable(dev);
+ if (!dev->mode_config.poll_enabled)
+ drm_kms_helper_poll_enable(dev);
/* enable hotplug interrupts */
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -743,7 +743,10 @@ nouveau_pmops_runtime_resume(struct devi
pci_set_master(pdev);
ret = nouveau_do_resume(drm_dev, true);
- drm_kms_helper_poll_enable(drm_dev);
+
+ if (!drm_dev->mode_config.poll_enabled)
+ drm_kms_helper_poll_enable(drm_dev);
+
/* do magic */
nvif_mask(&device->object, 0x088488, (1 << 25), (1 << 25));
vga_switcheroo_set_dynamic_switch(pdev, VGA_SWITCHEROO_ON);