x86/amd-iommu: Move compl-wait command building to own function

This patch introduces a seperate function for building
completion-wait commands.

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

1 files changed, 8 insertions, 3 deletions

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 57ca77787220..eebd504519c6 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -383,6 +383,13 @@ irqreturn_t amd_iommu_int_handler(int irq, void *data)
  *
  ****************************************************************************/
 
+static void build_completion_wait(struct iommu_cmd *cmd)
+{
+        memset(cmd, 0, sizeof(*cmd));
+        cmd->data[0] = CMD_COMPL_WAIT_INT_MASK;
+        CMD_SET_TYPE(cmd, CMD_COMPL_WAIT);
+}
+
 /*
  * Writes the command to the IOMMUs command buffer and informs the
  * hardware about the new command. Must be called with iommu->lock held.
@@ -458,9 +465,7 @@ static int __iommu_completion_wait(struct amd_iommu *iommu)
 {
         struct iommu_cmd cmd;
 
-         memset(&cmd, 0, sizeof(cmd));
-         cmd.data[0] = CMD_COMPL_WAIT_INT_MASK;
-         CMD_SET_TYPE(&cmd, CMD_COMPL_WAIT);
+        build_completion_wait(&cmd);
 
          return __iommu_queue_command(iommu, &cmd);
 }