[Xen-devel] [PATCH] AMD/IOMMU: disable previously enabled IOMMUs upon init failure

["Jan Beulich" <JBeulich@xxxxxxxx>]

If any IOMMUs were successfully initialized before encountering failure,
the successfully enabled ones should be disabled again before cleaning
up their resources.

Move disable_iommu() next to enable_iommu() to avoid a forward
declaration, and take the opportunity to remove stray blank lines ahead
of both functions' final closing braces.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/drivers/passthrough/amd/iommu_init.c
+++ b/xen/drivers/passthrough/amd/iommu_init.c
@@ -909,7 +909,35 @@ static void enable_iommu(struct amd_iomm
 
     iommu->enabled = 1;
     spin_unlock_irqrestore(&iommu->lock, flags);
+}
+
+static void disable_iommu(struct amd_iommu *iommu)
+{
+    unsigned long flags;
+
+    spin_lock_irqsave(&iommu->lock, flags);
+
+    if ( !iommu->enabled )
+    {
+        spin_unlock_irqrestore(&iommu->lock, flags);
+        return;
+    }
+
+    amd_iommu_msi_enable(iommu, IOMMU_CONTROL_DISABLED);
+    set_iommu_command_buffer_control(iommu, IOMMU_CONTROL_DISABLED);
+    set_iommu_event_log_control(iommu, IOMMU_CONTROL_DISABLED);
+
+    if ( amd_iommu_has_feature(iommu, IOMMU_EXT_FEATURE_PPRSUP_SHIFT) )
+        set_iommu_ppr_log_control(iommu, IOMMU_CONTROL_DISABLED);
+
+    if ( amd_iommu_has_feature(iommu, IOMMU_EXT_FEATURE_GTSUP_SHIFT) )
+        set_iommu_guest_translation_control(iommu, IOMMU_CONTROL_DISABLED);
+
+    set_iommu_translation_control(iommu, IOMMU_CONTROL_DISABLED);
 
+    iommu->enabled = 0;
+
+    spin_unlock_irqrestore(&iommu->lock, flags);
 }
 
 static void __init deallocate_buffer(void *buf, uint32_t sz)
@@ -1046,6 +1074,7 @@ static void __init amd_iommu_init_cleanu
         list_del(&iommu->list);
         if ( iommu->enabled )
         {
+            disable_iommu(iommu);
             deallocate_ring_buffer(&iommu->cmd_buffer);
             deallocate_ring_buffer(&iommu->event_log);
             deallocate_ring_buffer(&iommu->ppr_log);
@@ -1297,36 +1326,6 @@ error_out:
     return rc;
 }
 
-static void disable_iommu(struct amd_iommu *iommu)
-{
-    unsigned long flags;
-
-    spin_lock_irqsave(&iommu->lock, flags);
-
-    if ( !iommu->enabled )
-    {
-        spin_unlock_irqrestore(&iommu->lock, flags); 
-        return;
-    }
-
-    amd_iommu_msi_enable(iommu, IOMMU_CONTROL_DISABLED);
-    set_iommu_command_buffer_control(iommu, IOMMU_CONTROL_DISABLED);
-    set_iommu_event_log_control(iommu, IOMMU_CONTROL_DISABLED);
-
-    if ( amd_iommu_has_feature(iommu, IOMMU_EXT_FEATURE_PPRSUP_SHIFT) )
-        set_iommu_ppr_log_control(iommu, IOMMU_CONTROL_DISABLED);
-
-    if ( amd_iommu_has_feature(iommu, IOMMU_EXT_FEATURE_GTSUP_SHIFT) )
-        set_iommu_guest_translation_control(iommu, IOMMU_CONTROL_DISABLED);
-
-    set_iommu_translation_control(iommu, IOMMU_CONTROL_DISABLED);
-
-    iommu->enabled = 0;
-
-    spin_unlock_irqrestore(&iommu->lock, flags);
-
-}
-
 static void invalidate_all_domain_pages(void)
 {
     struct domain *d;





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