1 files changed, 15 insertions, 58 deletions

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 86c8e42f7fe..1a239a83f92 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -208,45 +208,29 @@ void irq_shutdown(struct irq_desc *desc)
 {
         desc->status |= IRQ_MASKED | IRQ_DISABLED;
         desc->depth = 1;
-        desc->irq_data.chip->irq_shutdown(&desc->irq_data);
+        if (desc->irq_data.chip->irq_shutdown)
+                desc->irq_data.chip->irq_shutdown(&desc->irq_data);
+        if (desc->irq_data.chip->irq_disable)
+                desc->irq_data.chip->irq_disable(&desc->irq_data);
+        else
+                desc->irq_data.chip->irq_mask(&desc->irq_data);
 }
 
 void irq_enable(struct irq_desc *desc)
 {
-        desc->irq_data.chip->irq_enable(&desc->irq_data);
-}
-
-void irq_disable(struct irq_desc *desc)
-{
-        desc->irq_data.chip->irq_disable(&desc->irq_data);
-}
-
-/*
- * default enable function
- */
-static void default_enable(struct irq_data *data)
-{
-        struct irq_desc *desc = irq_data_to_desc(data);
-
-        desc->irq_data.chip->irq_unmask(&desc->irq_data);
+        if (desc->irq_data.chip->irq_enable)
+                desc->irq_data.chip->irq_enable(&desc->irq_data);
+        else
+                desc->irq_data.chip->irq_unmask(&desc->irq_data);
         desc->status &= ~IRQ_MASKED;
 }
 
-/*
- * default disable function
- */
-static void default_disable(struct irq_data *data)
-{
-}
-
-/*
- * default shutdown function
- */
-static void default_shutdown(struct irq_data *data)
+void irq_disable(struct irq_desc *desc)
 {
-        struct irq_desc *desc = irq_data_to_desc(data);
-
-        desc->irq_data.chip->irq_mask(&desc->irq_data);
+        if (desc->irq_data.chip->irq_disable) {
+                desc->irq_data.chip->irq_disable(&desc->irq_data);
+                desc->status |= IRQ_MASKED;
+        }
 }
 
 #ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
@@ -334,10 +318,6 @@ static void compat_bus_sync_unlock(struct irq_data *data)
 void irq_chip_set_defaults(struct irq_chip *chip)
 {
 #ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
-        /*
-         * Compat fixup functions need to be before we set the
-         * defaults for enable/disable/startup/shutdown
-         */
         if (chip->enable)
                 chip->irq_enable = compat_irq_enable;
         if (chip->disable)
@@ -346,31 +326,8 @@ void irq_chip_set_defaults(struct irq_chip *chip)
                 chip->irq_shutdown = compat_irq_shutdown;
         if (chip->startup)
                 chip->irq_startup = compat_irq_startup;
-#endif
-        /*
-         * The real defaults
-         */
-        if (!chip->irq_enable)
-                chip->irq_enable = default_enable;
-        if (!chip->irq_disable)
-                chip->irq_disable = default_disable;
-        /*
-         * We use chip->irq_disable, when the user provided its own. When
-         * we have default_disable set for chip->irq_disable, then we need
-         * to use default_shutdown, otherwise the irq line is not
-         * disabled on free_irq():
-         */
-        if (!chip->irq_shutdown)
-                chip->irq_shutdown = chip->irq_disable != default_disable ?
-                        chip->irq_disable : default_shutdown;
-
-#ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
         if (!chip->end)
                 chip->end = dummy_irq_chip.end;
-
-        /*
-         * Now fix up the remaining compat handlers
-         */
         if (chip->bus_lock)
                 chip->irq_bus_lock = compat_bus_lock;
         if (chip->bus_sync_unlock)