[PATCH] drm/amdgpu: Fix mutex lock from atomic context.

[Chen, Guchun]

Also it's irrelevant for this partilcular interrupt as this is generic RAS interrupt and not memory errors specific.
[Guchun]One typo, it should be "particular", not " partilcular". With that fixed, the patch is: Reviewed-by: Guchun Chen <guchun.chen at amd.com>


-----Original Message-----
From: Andrey Grodzovsky <andrey.grodzovsky at amd.com> 
Sent: Wednesday, September 11, 2019 3:41 AM
To: amd-gfx at lists.freedesktop.org
Cc: Chen, Guchun <Guchun.Chen at amd.com>; Zhou1, Tao <Tao.Zhou1 at amd.com>; Deucher, Alexander <Alexander.Deucher at amd.com>; Grodzovsky, Andrey <Andrey.Grodzovsky at amd.com>
Subject: [PATCH] drm/amdgpu: Fix mutex lock from atomic context.

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.
[Guchun]One typo, it should be "particular", not " partilcular". With that fixed, the patch is: Reviewed-by: Guchun Chen <guchun.chen at amd.com>

Fix:
Avoid calling amdgpu_ras_reserve_bad_pages if not in task context.

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky at amd.com>
---
 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 012034d..dd5da3c 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;
--
2.7.4