From 708901a6664fdc8a39d7946a3995d46eca4fb3e9 Mon Sep 17 00:00:00 2001
From: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Date: Tue, 10 Sep 2019 15:34:16 -0400
Subject: drm/amdgpu: Fix mutex lock from atomic context.
Git-commit: 708901a6664fdc8a39d7946a3995d46eca4fb3e9
Patch-mainline: v5.5-rc1
References: bsc#1152489

Problem:
amdgpu_ras_reserve_bad_pages was moved to amdgpu_ras_reset_gpu
because writing to EEPROM during ASIC reset was unstable.
But for ERREVENT_ATHUB_INTERRUPT amdgpu_ras_reset_gpu is called
directly from ISR context and so locking is not allowed. Also it's
irrelevant for this partilcular interrupt as this is generic RAS
interrupt and not memory errors specific.

Fix:
Avoid calling amdgpu_ras_reserve_bad_pages if not in task context.

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Reviewed-by: Tao Zhou <tao.zhou1@amd.com>
Reviewed-by: Guchun Chen <guchun.chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
index 012034d2ae06..dd5da3c6327e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
@@ -504,7 +504,9 @@ static inline int amdgpu_ras_reset_gpu(struct amdgpu_device *adev,
 	/* save bad page to eeprom before gpu reset,
 	 * i2c may be unstable in gpu reset
 	 */
-	amdgpu_ras_reserve_bad_pages(adev);
+	if (in_task())
+		amdgpu_ras_reserve_bad_pages(adev);
+
 	if (atomic_cmpxchg(&ras->in_recovery, 0, 1) == 0)
 		schedule_work(&ras->recovery_work);
 	return 0;
-- 
2.28.0