genirq: Sanitize dynamic irq handling

Use the cleanup functions of the dynamic allocator. No need to have
separate implementations.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@elte.hu>

3 files changed, 23 insertions, 121 deletions

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 3405761d6224..baa5c4acad83 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -18,108 +18,6 @@
 
 #include "internals.h"
 
-static void dynamic_irq_init_x(unsigned int irq, bool keep_chip_data)
-{
-        struct irq_desc *desc;
-        unsigned long flags;
-
-        desc = irq_to_desc(irq);
-        if (!desc) {
-                WARN(1, KERN_ERR "Trying to initialize invalid IRQ%d\n", irq);
-                return;
-        }
-
-        /* Ensure we don't have left over values from a previous use of this irq */
-        raw_spin_lock_irqsave(&desc->lock, flags);
-        desc->status = IRQ_DEFAULT_INIT_FLAGS;
-        desc->irq_data.chip = &no_irq_chip;
-        desc->handle_irq = handle_bad_irq;
-        desc->depth = 1;
-        desc->irq_data.msi_desc = NULL;
-        desc->irq_data.handler_data = NULL;
-        if (!keep_chip_data)
-                desc->irq_data.chip_data = NULL;
-        desc->action = NULL;
-        desc->irq_count = 0;
-        desc->irqs_unhandled = 0;
-#ifdef CONFIG_SMP
-        cpumask_setall(desc->irq_data.affinity);
-#ifdef CONFIG_GENERIC_PENDING_IRQ
-        cpumask_clear(desc->pending_mask);
-#endif
-#endif
-        raw_spin_unlock_irqrestore(&desc->lock, flags);
-}
-
-/**
- *      dynamic_irq_init - initialize a dynamically allocated irq
- *      @irq:   irq number to initialize
- */
-void dynamic_irq_init(unsigned int irq)
-{
-        dynamic_irq_init_x(irq, false);
-}
-
-/**
- *      dynamic_irq_init_keep_chip_data - initialize a dynamically allocated irq
- *      @irq:   irq number to initialize
- *
- *      does not set irq_to_desc(irq)->irq_data.chip_data to NULL
- */
-void dynamic_irq_init_keep_chip_data(unsigned int irq)
-{
-        dynamic_irq_init_x(irq, true);
-}
-
-static void dynamic_irq_cleanup_x(unsigned int irq, bool keep_chip_data)
-{
-        struct irq_desc *desc = irq_to_desc(irq);
-        unsigned long flags;
-
-        if (!desc) {
-                WARN(1, KERN_ERR "Trying to cleanup invalid IRQ%d\n", irq);
-                return;
-        }
-
-        raw_spin_lock_irqsave(&desc->lock, flags);
-        if (desc->action) {
-                raw_spin_unlock_irqrestore(&desc->lock, flags);
-                WARN(1, KERN_ERR "Destroying IRQ%d without calling free_irq\n",
-                        irq);
-                return;
-        }
-        desc->irq_data.msi_desc = NULL;
-        desc->irq_data.handler_data = NULL;
-        if (!keep_chip_data)
-                desc->irq_data.chip_data = NULL;
-        desc->handle_irq = handle_bad_irq;
-        desc->irq_data.chip = &no_irq_chip;
-        desc->name = NULL;
-        clear_kstat_irqs(desc);
-        raw_spin_unlock_irqrestore(&desc->lock, flags);
-}
-
-/**
- *      dynamic_irq_cleanup - cleanup a dynamically allocated irq
- *      @irq:   irq number to initialize
- */
-void dynamic_irq_cleanup(unsigned int irq)
-{
-        dynamic_irq_cleanup_x(irq, false);
-}
-
-/**
- *      dynamic_irq_cleanup_keep_chip_data - cleanup a dynamically allocated irq
- *      @irq:   irq number to initialize
- *
- *      does not set irq_to_desc(irq)->irq_data.chip_data to NULL
- */
-void dynamic_irq_cleanup_keep_chip_data(unsigned int irq)
-{
-        dynamic_irq_cleanup_x(irq, true);
-}
-
-
 /**
  *      set_irq_chip - set the irq chip for an irq
  *      @irq:   irq number
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index 8eb01e379ccc..f444203a772d 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -20,7 +20,6 @@ extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume);
 
 extern struct lock_class_key irq_desc_lock_class;
 extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
-extern void clear_kstat_irqs(struct irq_desc *desc);
 extern raw_spinlock_t sparse_irq_lock;
 
 /* Resending of interrupts :*/
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 6c71f8ea5d7d..c9d5a1c12874 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -53,12 +53,21 @@ static void desc_smp_init(struct irq_desc *desc, int node)
 {
         desc->irq_data.node = node;
         cpumask_copy(desc->irq_data.affinity, irq_default_affinity);
+#ifdef CONFIG_GENERIC_PENDING_IRQ
+        cpumask_clear(desc->pending_mask);
+#endif
+}
+
+static inline int desc_node(struct irq_desc *desc)
+{
+        return desc->irq_data.node;
 }
 
 #else
 static inline int
 alloc_masks(struct irq_desc *desc, gfp_t gfp, int node) { return 0; }
 static inline void desc_smp_init(struct irq_desc *desc, int node) { }
+static inline int desc_node(struct irq_desc *desc) { return 0; }
 #endif
 
 static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node)
@@ -71,6 +80,8 @@ static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node)
         desc->status = IRQ_DEFAULT_INIT_FLAGS;
         desc->handle_irq = handle_bad_irq;
         desc->depth = 1;
+        desc->irq_count = 0;
+        desc->irqs_unhandled = 0;
         desc->name = NULL;
         memset(desc->kstat_irqs, 0, nr_cpu_ids * sizeof(*(desc->kstat_irqs)));
         desc_smp_init(desc, node);
@@ -286,23 +297,9 @@ struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node)
         return irq_to_desc(irq);
 }
 
-#ifdef CONFIG_SMP
-static inline int desc_node(struct irq_desc *desc)
-{
-        return desc->irq_data.node;
-}
-#else
-static inline int desc_node(struct irq_desc *desc) { return 0; }
-#endif
-
 static void free_desc(unsigned int irq)
 {
-        struct irq_desc *desc = irq_to_desc(irq);
-        unsigned long flags;
-
-        raw_spin_lock_irqsave(&desc->lock, flags);
-        desc_set_defaults(irq, desc, desc_node(desc));
-        raw_spin_unlock_irqrestore(&desc->lock, flags);
+        dynamic_irq_cleanup(irq);
 }
 
 static inline int alloc_descs(unsigned int start, unsigned int cnt, int node)
@@ -409,10 +406,18 @@ unsigned int irq_get_next_irq(unsigned int offset)
         return find_next_bit(allocated_irqs, nr_irqs, offset);
 }
 
-/* Statistics access */
-void clear_kstat_irqs(struct irq_desc *desc)
+/**
+ * dynamic_irq_cleanup - cleanup a dynamically allocated irq
+ * @irq:        irq number to initialize
+ */
+void dynamic_irq_cleanup(unsigned int irq)
 {
-        memset(desc->kstat_irqs, 0, nr_cpu_ids * sizeof(*(desc->kstat_irqs)));
+        struct irq_desc *desc = irq_to_desc(irq);
+        unsigned long flags;
+
+        raw_spin_lock_irqsave(&desc->lock, flags);
+        desc_set_defaults(irq, desc, desc_node(desc));
+        raw_spin_unlock_irqrestore(&desc->lock, flags);
 }
 
 unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)