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From dc3584a5b81f68c8018a43fd4034dd8b67bcf618 Mon Sep 17 00:00:00 2001
From: Felix Kuehling <Felix.Kuehling@amd.com>
Date: Mon, 29 Aug 2016 19:38:54 -0400
Subject: [PATCH 1496/4131] drm/amdkfd: Fix kernel panic in PPR handler
Use the correct function to release the reference to mm_struct in
kfd_signal_iommu_event. The counterpart to get_task_mm is mmput,
not mmdrop. This fixes a kernel panic after getting PPR events
from the IOMMUv2.
Bug: SWDEV-101197
Change-Id: Iba45bf4ce98e5c02ee11cb86d199d0c9f69c2c42
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
---
drivers/gpu/drm/amd/amdkfd/kfd_events.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_events.c b/drivers/gpu/drm/amd/amdkfd/kfd_events.c
index f110eba..939b7e7 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_events.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_events.c
@@ -1070,7 +1070,7 @@ void kfd_signal_iommu_event(struct kfd_dev *dev, unsigned int pasid,
}
up_read(&mm->mmap_sem);
- mmdrop(mm);
+ mmput(mm);
mutex_lock(&p->event_mutex);
--
2.7.4
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