From: Joerg Roedel <jroedel@suse.de>
Date: Wed, 4 Feb 2015 14:50:38 +0000 (+0100)
Subject: iommu/amd: Use wait_event in put_pasid_state_wait
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a1bec062c90456983225054d39c8a601db48e638;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

iommu/amd: Use wait_event in put_pasid_state_wait

Now that I learned about possible spurious wakeups this
place needs fixing too. Replace the self-coded sleep variant
with the generic wait_event() helper.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
---

diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c
index b6398d7285f7..5cc140969b43 100644
--- a/drivers/iommu/amd_iommu_v2.c
+++ b/drivers/iommu/amd_iommu_v2.c
@@ -266,14 +266,7 @@ static void put_pasid_state(struct pasid_state *pasid_state)
 
 static void put_pasid_state_wait(struct pasid_state *pasid_state)
 {
-	DEFINE_WAIT(wait);
-
-	prepare_to_wait(&pasid_state->wq, &wait, TASK_UNINTERRUPTIBLE);
-
-	if (!atomic_dec_and_test(&pasid_state->count))
-		schedule();
-
-	finish_wait(&pasid_state->wq, &wait);
+	wait_event(pasid_state->wq, !atomic_read(&pasid_state->count));
 	free_pasid_state(pasid_state);
 }