linux-kernel - [PATCH 4.17 32/63] drm/nouveau: Remove bogus crtc check in pmops_runtime

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Message-Id: <20180723122447.586199650@linuxfoundation.org>
Date:   Mon, 23 Jul 2018 14:24:38 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lyude Paul <lyude@...hat.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Ben Skeggs <bskeggs@...hat.com>
Subject: [PATCH 4.17 32/63] drm/nouveau: Remove bogus crtc check in pmops_runtime_idle

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Lyude Paul <lyude@...hat.com>

commit 68fe23a626b67b56c912c496ea43ed537ea9708f upstream.

This both uses the legacy modesetting structures in a racy manner, and
additionally also doesn't even check the right variable (enabled != the
CRTC is actually turned on for atomic).

This fixes issues on my P50 regarding the dedicated GPU not entering
runtime suspend.

Signed-off-by: Lyude Paul <lyude@...hat.com>
Cc: stable@...r.kernel.org
Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>
Signed-off-by: Ben Skeggs <bskeggs@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/nouveau/nouveau_drm.c |   11 -----------
 1 file changed, 11 deletions(-)

--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -866,22 +866,11 @@ nouveau_pmops_runtime_resume(struct devi
 static int
 nouveau_pmops_runtime_idle(struct device *dev)
 {
-	struct pci_dev *pdev = to_pci_dev(dev);
-	struct drm_device *drm_dev = pci_get_drvdata(pdev);
-	struct nouveau_drm *drm = nouveau_drm(drm_dev);
-	struct drm_crtc *crtc;
-
 	if (!nouveau_pmops_runtime()) {
 		pm_runtime_forbid(dev);
 		return -EBUSY;
 	}
 
-	list_for_each_entry(crtc, &drm->dev->mode_config.crtc_list, head) {
-		if (crtc->enabled) {
-			DRM_DEBUG_DRIVER("failing to power off - crtc active\n");
-			return -EBUSY;
-		}
-	}
 	pm_runtime_mark_last_busy(dev);
 	pm_runtime_autosuspend(dev);
 	/* we don't want the main rpm_idle to call suspend - we want to autosuspend */