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authorJoerg Roedel <joerg.roedel@amd.com>2011-09-02 14:10:32 +0200
committerJoerg Roedel <joerg.roedel@amd.com>2011-09-02 14:10:32 +0200
commitf1ca1512e765337a7c09eb875eedef8ea4e07654 (patch)
tree79bc491e98ab55af1575a3e4dec8e31f1f32be62 /drivers/iommu
parentc6a389f123b9f68d605bb7e0f9b32ec1e3e14132 (diff)
iommu/amd: Make sure iommu->need_sync contains correct value
The value is only set to true but never set back to false, which causes to many completion-wait commands to be sent to hardware. Fix it with this patch. Cc: stable@kernel.org Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/amd_iommu.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index a14f8dc2346..45652231dae 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -605,7 +605,9 @@ static void build_inv_all(struct iommu_cmd *cmd)
* Writes the command to the IOMMUs command buffer and informs the
* hardware about the new command.
*/
-static int iommu_queue_command(struct amd_iommu *iommu, struct iommu_cmd *cmd)
+static int iommu_queue_command_sync(struct amd_iommu *iommu,
+ struct iommu_cmd *cmd,
+ bool sync)
{
u32 left, tail, head, next_tail;
unsigned long flags;
@@ -639,13 +641,18 @@ again:
copy_cmd_to_buffer(iommu, cmd, tail);
/* We need to sync now to make sure all commands are processed */
- iommu->need_sync = true;
+ iommu->need_sync = sync;
spin_unlock_irqrestore(&iommu->lock, flags);
return 0;
}
+static int iommu_queue_command(struct amd_iommu *iommu, struct iommu_cmd *cmd)
+{
+ return iommu_queue_command_sync(iommu, cmd, true);
+}
+
/*
* This function queues a completion wait command into the command
* buffer of an IOMMU
@@ -661,7 +668,7 @@ static int iommu_completion_wait(struct amd_iommu *iommu)
build_completion_wait(&cmd, (u64)&sem);
- ret = iommu_queue_command(iommu, &cmd);
+ ret = iommu_queue_command_sync(iommu, &cmd, false);
if (ret)
return ret;