linux-kernel - [PATCH 5.15 71/72] Revert "drm/amdgpu: stop scheduler when calling hw

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Date:   Mon, 10 Jan 2022 08:23:48 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Guchun Chen <guchun.chen@....com>,
        Andrey Grodzovsky <andrey.grodzovsky@....com>,
        Christian Koenig <christian.koenig@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Len Brown <len.brown@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 5.15 71/72] Revert "drm/amdgpu: stop scheduler when calling hw_fini (v2)"

From: Len Brown <len.brown@...el.com>

commit df5bc0aa7ff6e2e14cb75182b4eda20253c711d4 upstream.

This reverts commit f7d6779df642720e22bffd449e683bb8690bd3bf.

This bisected regression has impacted suspend-resume stability
since 5.15-rc1. It regressed -stable via 5.14.10.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=215315
Fixes: f7d6779df64 ("drm/amdgpu: stop scheduler when calling hw_fini (v2)")
Cc: Guchun Chen <guchun.chen@....com>
Cc: Andrey Grodzovsky <andrey.grodzovsky@....com>
Cc: Christian Koenig <christian.koenig@....com>
Cc: Alex Deucher <alexander.deucher@....com>
Cc: <stable@...r.kernel.org> # 5.14+
Signed-off-by: Len Brown <len.brown@...el.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c |    8 --------
 1 file changed, 8 deletions(-)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
@@ -552,9 +552,6 @@ void amdgpu_fence_driver_hw_fini(struct
 		if (!ring || !ring->fence_drv.initialized)
 			continue;
 
-		if (!ring->no_scheduler)
-			drm_sched_stop(&ring->sched, NULL);
-
 		/* You can't wait for HW to signal if it's gone */
 		if (!drm_dev_is_unplugged(&adev->ddev))
 			r = amdgpu_fence_wait_empty(ring);
@@ -614,11 +611,6 @@ void amdgpu_fence_driver_hw_init(struct
 		if (!ring || !ring->fence_drv.initialized)
 			continue;
 
-		if (!ring->no_scheduler) {
-			drm_sched_resubmit_jobs(&ring->sched);
-			drm_sched_start(&ring->sched, true);
-		}
-
 		/* enable the interrupt */
 		if (ring->fence_drv.irq_src)
 			amdgpu_irq_get(adev, ring->fence_drv.irq_src,