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authorHeiko Carstens <heiko.carstens@de.ibm.com>2011-01-05 12:47:41 +0100
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2011-01-05 12:47:26 +0100
commitb1b750918566c6c4e8ed6c9b3c0f05b4c0a8805c (patch)
treea40f322d2b65f26e82d93139d0dc275543e08b27 /arch/s390/kernel
parent98b799800c3e2f855ef2d2c6263e84fa5d1420a0 (diff)
downloadlinux-linaro-stable-b1b750918566c6c4e8ed6c9b3c0f05b4c0a8805c.tar.gz
[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>
Diffstat (limited to 'arch/s390/kernel')
-rw-r--r--arch/s390/kernel/s390_ext.c125
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);