From: Joerg Roedel <joerg.roedel@amd.com>
Date: Thu, 26 Nov 2009 14:45:41 +0000 (+0100)
Subject: x86/amd-iommu: Move reset_iommu_command_buffer out of locked code
X-Git-Tag: v2.6.33-rc1~409^2~3
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=8eed9833346781dd15e3bef35a91b0a40787ea3c;p=~shefty%2Frdma-dev.git

x86/amd-iommu: Move reset_iommu_command_buffer out of locked code

This patch removes the ugly contruct where the
iommu->lock must be released while before calling the
reset_iommu_command_buffer function.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 0eafca58926..b75fcd9b6a0 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -285,6 +285,7 @@ static void iommu_print_event(struct amd_iommu *iommu, void *__evt)
 		break;
 	case EVENT_TYPE_ILL_CMD:
 		printk("ILLEGAL_COMMAND_ERROR address=0x%016llx]\n", address);
+		iommu->reset_in_progress = true;
 		reset_iommu_command_buffer(iommu);
 		dump_command(address);
 		break;
@@ -407,11 +408,8 @@ static void __iommu_wait_for_completion(struct amd_iommu *iommu)
 	status &= ~MMIO_STATUS_COM_WAIT_INT_MASK;
 	writel(status, iommu->mmio_base + MMIO_STATUS_OFFSET);
 
-	if (unlikely(i == EXIT_LOOP_COUNT)) {
-		spin_unlock(&iommu->lock);
-		reset_iommu_command_buffer(iommu);
-		spin_lock(&iommu->lock);
-	}
+	if (unlikely(i == EXIT_LOOP_COUNT))
+		iommu->reset_in_progress = true;
 }
 
 /*
@@ -458,6 +456,9 @@ static int iommu_completion_wait(struct amd_iommu *iommu)
 out:
 	spin_unlock_irqrestore(&iommu->lock, flags);
 
+	if (iommu->reset_in_progress)
+		reset_iommu_command_buffer(iommu);
+
 	return 0;
 }
 
@@ -649,8 +650,6 @@ static void reset_iommu_command_buffer(struct amd_iommu *iommu)
 	if (iommu->reset_in_progress)
 		panic("AMD-Vi: ILLEGAL_COMMAND_ERROR while resetting command buffer\n");
 
-	iommu->reset_in_progress = true;
-
 	amd_iommu_reset_cmd_buffer(iommu);
 	amd_iommu_flush_all_devices();
 	amd_iommu_flush_all_domains();