[S390] extint: get rid of early code plus cleanup

Get rid of register/unregister_early_external_interrupt() and clean up
the code while at it.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 44 insertions, 81 deletions

diff --git a/arch/s390/kernel/s390_ext.c b/arch/s390/kernel/s390_ext.c
index bd1db508e8af..185029919c4d 100644
--- a/arch/s390/kernel/s390_ext.c
+++ b/arch/s390/kernel/s390_ext.c
@@ -1,33 +1,36 @@
 /*
- *  arch/s390/kernel/s390_ext.c
- *
- *  S390 version
- *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
- *    Author(s): Holger Smolinski (Holger.Smolinski@de.ibm.com),
- *               Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *    Copyright IBM Corp. 1999,2010
+ *    Author(s): Holger Smolinski <Holger.Smolinski@de.ibm.com>,
+ *               Martin Schwidefsky <schwidefsky@de.ibm.com>,
  */
 
+#include <linux/kernel_stat.h>
+#include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
-#include <linux/slab.h>
 #include <linux/ftrace.h>
 #include <linux/errno.h>
-#include <linux/kernel_stat.h>
-#include <linux/interrupt.h>
-#include <asm/cputime.h>
-#include <asm/lowcore.h>
+#include <linux/slab.h>
 #include <asm/s390_ext.h>
 #include <asm/irq_regs.h>
+#include <asm/cputime.h>
+#include <asm/lowcore.h>
 #include <asm/irq.h>
 #include "entry.h"
 
+struct ext_int_info {
+        struct ext_int_info *next;
+        ext_int_handler_t handler;
+        __u16 code;
+};
+
 /*
  * ext_int_hash[index] is the start of the list for all external interrupts
  * that hash to this index. With the current set of external interrupts 
  * (0x1202 external call, 0x1004 cpu timer, 0x2401 hwc console, 0x4000
  * iucv and 0x2603 pfault) this is always the first element. 
  */
-ext_int_info_t *ext_int_hash[256] = { NULL, };
+static struct ext_int_info *ext_int_hash[256];
 
 static inline int ext_hash(__u16 code)
 {
@@ -36,90 +39,53 @@ static inline int ext_hash(__u16 code)
 
 int register_external_interrupt(__u16 code, ext_int_handler_t handler)
 {
-        ext_int_info_t *p;
-        int index;
-
-        p = kmalloc(sizeof(ext_int_info_t), GFP_ATOMIC);
-        if (p == NULL)
-                return -ENOMEM;
-        p->code = code;
-        p->handler = handler;
-        index = ext_hash(code);
-        p->next = ext_int_hash[index];
-        ext_int_hash[index] = p;
-        return 0;
-}
-
-int register_early_external_interrupt(__u16 code, ext_int_handler_t handler,
-                                      ext_int_info_t *p)
-{
-        int index;
+        struct ext_int_info *p;
+        int index;
 
-        if (p == NULL)
-                return -EINVAL;
-        p->code = code;
-        p->handler = handler;
+        p = kmalloc(sizeof(*p), GFP_ATOMIC);
+        if (!p)
+                return -ENOMEM;
+        p->code = code;
+        p->handler = handler;
         index = ext_hash(code);
-        p->next = ext_int_hash[index];
-        ext_int_hash[index] = p;
-        return 0;
+        p->next = ext_int_hash[index];
+        ext_int_hash[index] = p;
+        return 0;
 }
+EXPORT_SYMBOL(register_external_interrupt);
 
 int unregister_external_interrupt(__u16 code, ext_int_handler_t handler)
 {
-        ext_int_info_t *p, *q;
-        int index;
-
-        index = ext_hash(code);
-        q = NULL;
-        p = ext_int_hash[index];
-        while (p != NULL) {
-                if (p->code == code && p->handler == handler)
-                        break;
-                q = p;
-                p = p->next;
-        }
-        if (p == NULL)
-                return -ENOENT;
-        if (q != NULL)
-                q->next = p->next;
-        else
-                ext_int_hash[index] = p->next;
-        kfree(p);
-        return 0;
-}
-
-int unregister_early_external_interrupt(__u16 code, ext_int_handler_t handler,
-                                        ext_int_info_t *p)
-{
-        ext_int_info_t *q;
+        struct ext_int_info *p, *q;
         int index;
 
-        if (p == NULL || p->code != code || p->handler != handler)
-                return -EINVAL;
         index = ext_hash(code);
-        q = ext_int_hash[index];
-        if (p != q) {
-                while (q != NULL) {
-                        if (q->next == p)
-                                break;
-                        q = q->next;
-                }
-                if (q == NULL)
-                        return -ENOENT;
+        q = NULL;
+        p = ext_int_hash[index];
+        while (p) {
+                if (p->code == code && p->handler == handler)
+                        break;
+                q = p;
+                p = p->next;
+        }
+        if (!p)
+                return -ENOENT;
+        if (q)
                 q->next = p->next;
-        } else
+        else
                 ext_int_hash[index] = p->next;
+        kfree(p);
         return 0;
 }
+EXPORT_SYMBOL(unregister_external_interrupt);
 
 void __irq_entry do_extint(struct pt_regs *regs, unsigned int ext_int_code,
                            unsigned int param32, unsigned long param64)
 {
         struct pt_regs *old_regs;
         unsigned short code;
-        ext_int_info_t *p;
-        int index;
+        struct ext_int_info *p;
+        int index;
 
         code = (unsigned short) ext_int_code;
         old_regs = set_irq_regs(regs);
@@ -132,7 +98,7 @@ void __irq_entry do_extint(struct pt_regs *regs, unsigned int ext_int_code,
         kstat_cpu(smp_processor_id()).irqs[EXTERNAL_INTERRUPT]++;
         if (code != 0x1004)
                 __get_cpu_var(s390_idle).nohz_delay = 1;
-        index = ext_hash(code);
+        index = ext_hash(code);
         for (p = ext_int_hash[index]; p; p = p->next) {
                 if (likely(p->code == code))
                         p->handler(ext_int_code, param32, param64);
@@ -140,6 +106,3 @@ void __irq_entry do_extint(struct pt_regs *regs, unsigned int ext_int_code,
         irq_exit();
         set_irq_regs(old_regs);
 }
-
-EXPORT_SYMBOL(register_external_interrupt);
-EXPORT_SYMBOL(unregister_external_interrupt);