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Date: Mon, 19 May 2008 14:06:42 +0100
From: Alan Cox <alan@...rguk.ukuu.org.uk>
To: akpm@...l.org, linux-kernel@...r.kernel.org, wim@...ana.be
Subject: [PATCH 21/57] ixp2000_wdt: clean up and unlocked_ioctl
From: Alan Cox <alan@...hat.com>
---
drivers/watchdog/ixp2000_wdt.c | 50 ++++++++++++++++++----------------------
1 files changed, 23 insertions(+), 27 deletions(-)
diff --git a/drivers/watchdog/ixp2000_wdt.c b/drivers/watchdog/ixp2000_wdt.c
index dc7548d..943ceff 100644
--- a/drivers/watchdog/ixp2000_wdt.c
+++ b/drivers/watchdog/ixp2000_wdt.c
@@ -25,42 +25,45 @@
#include <linux/watchdog.h>
#include <linux/init.h>
#include <linux/bitops.h>
+#include <linux/uaccess.h>
#include <asm/hardware.h>
-#include <asm/uaccess.h>
static int nowayout = WATCHDOG_NOWAYOUT;
static unsigned int heartbeat = 60; /* (secs) Default is 1 minute */
static unsigned long wdt_status;
+static spinlock_t wdt_lock;
#define WDT_IN_USE 0
#define WDT_OK_TO_CLOSE 1
static unsigned long wdt_tick_rate;
-static void
-wdt_enable(void)
+static void wdt_enable(void)
{
+ spin_lock(&wdt_lock);
ixp2000_reg_write(IXP2000_RESET0, *(IXP2000_RESET0) | WDT_RESET_ENABLE);
ixp2000_reg_write(IXP2000_TWDE, WDT_ENABLE);
ixp2000_reg_write(IXP2000_T4_CLD, heartbeat * wdt_tick_rate);
ixp2000_reg_write(IXP2000_T4_CTL, TIMER_DIVIDER_256 | TIMER_ENABLE);
+ spin_unlock(&wdt_lock);
}
-static void
-wdt_disable(void)
+static void wdt_disable(void)
{
+ spin_lock(&wdt_lock);
ixp2000_reg_write(IXP2000_T4_CTL, 0);
+ spin_unlock(&wdt_lock);
}
-static void
-wdt_keepalive(void)
+static void wdt_keepalive(void)
{
+ spin_lock(&wdt_lock);
ixp2000_reg_write(IXP2000_T4_CLD, heartbeat * wdt_tick_rate);
+ spin_unlock(&wdt_lock);
}
-static int
-ixp2000_wdt_open(struct inode *inode, struct file *file)
+static int ixp2000_wdt_open(struct inode *inode, struct file *file)
{
if (test_and_set_bit(WDT_IN_USE, &wdt_status))
return -EBUSY;
@@ -72,8 +75,8 @@ ixp2000_wdt_open(struct inode *inode, struct file *file)
return nonseekable_open(inode, file);
}
-static ssize_t
-ixp2000_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos)
+static ssize_t ixp2000_wdt_write(struct file *file, const char *data,
+ size_t len, loff_t *ppos)
{
if (len) {
if (!nowayout) {
@@ -103,9 +106,8 @@ static struct watchdog_info ident = {
.identity = "IXP2000 Watchdog",
};
-static int
-ixp2000_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
- unsigned long arg)
+static long ixp2000_wdt_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
{
int ret = -ENOTTY;
int time;
@@ -151,16 +153,13 @@ ixp2000_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
return ret;
}
-static int
-ixp2000_wdt_release(struct inode *inode, struct file *file)
+static int ixp2000_wdt_release(struct inode *inode, struct file *file)
{
- if (test_bit(WDT_OK_TO_CLOSE, &wdt_status)) {
+ if (test_bit(WDT_OK_TO_CLOSE, &wdt_status))
wdt_disable();
- } else {
+ else
printk(KERN_CRIT "WATCHDOG: Device closed unexpectedly - "
"timer will not stop\n");
- }
-
clear_bit(WDT_IN_USE, &wdt_status);
clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
@@ -168,18 +167,16 @@ ixp2000_wdt_release(struct inode *inode, struct file *file)
}
-static const struct file_operations ixp2000_wdt_fops =
-{
+static const struct file_operations ixp2000_wdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = ixp2000_wdt_write,
- .ioctl = ixp2000_wdt_ioctl,
+ .unlocked_ioctl = ixp2000_wdt_ioctl,
.open = ixp2000_wdt_open,
.release = ixp2000_wdt_release,
};
-static struct miscdevice ixp2000_wdt_miscdev =
-{
+static struct miscdevice ixp2000_wdt_miscdev = {
.minor = WATCHDOG_MINOR,
.name = "watchdog",
.fops = &ixp2000_wdt_fops,
@@ -191,9 +188,8 @@ static int __init ixp2000_wdt_init(void)
printk(KERN_INFO "Unable to use IXP2000 watchdog due to IXP2800 erratum #25.\n");
return -EIO;
}
-
wdt_tick_rate = (*IXP2000_T1_CLD * HZ) / 256;
-
+ spin_lock_init(&wdt_lock);
return misc_register(&ixp2000_wdt_miscdev);
}
--
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