[PATCH 10/57] eurotechwdt: unlocked_ioctl, code lock check and tidy

Alan Cox
2008-05-19T13:21:04Z

drivers/watchdog/eurotechwdt.c | 57 +++++++++++++++++++++++++---------------
1 files changed, 36 insertions(+), 21 deletions(-)

diff --git a/drivers/watchdog/eurotechwdt.c b/drivers/watchdog/eurotechwdt.c
index b14e9d1..b94e6ef 100644
--- a/drivers/watchdog/eurotechwdt.c
+++ b/drivers/watchdog/eurotechwdt.c
@@ -56,14 +56,15 @@
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>

-#include <asm/io.h>
-#include <asm/uaccess.h>
#include <asm/system.h>

static unsigned long eurwdt_is_open;
static int eurwdt_timeout;
static char eur_expect_close;
+static spinlock_t eurwdt_lock;

/*
* You must set these - there is no sane way to probe for this board.
@@ -78,7 +79,9 @@ static char *ev = "int";

static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0);
-MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+MODULE_PARM_DESC(nowayout,
+ "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

/*
* Some symbolic names
@@ -137,7 +140,8 @@ static void eurwdt_activate_timer(void)
{
eurwdt_disable_timer();
eurwdt_write_reg(WDT_CTRL_REG, 0x01); /* activate the WDT */
- eurwdt_write_reg(WDT_OUTPIN_CFG, !strcmp("int", ev) ? WDT_EVENT_INT : WDT_EVENT_REBOOT);
+ eurwdt_write_reg(WDT_OUTPIN_CFG,
+ !strcmp("int", ev) ? WDT_EVENT_INT : WDT_EVENT_REBOOT);

/* Setting interrupt line */
if (irq == 2 || irq > 15 || irq < 0) {
@@ -206,21 +210,21 @@ size_t count, loff_t *ppos)

for (i = 0; i != count; i++) {
char c;
- if(get_user(c, buf+i))
+ if (get_user(c, buf+i))
return -EFAULT;
if (c == 'V')
eur_expect_close = 42;
}
}
+ spin_lock(&eurwdt_lock);
eurwdt_ping(); /* the default timeout */
+ spin_unlock(&eurwdt_lock);
}
-
return count;
}

/**
* eurwdt_ioctl:
- * @inode: inode of the device
* @file: file handle to the device
* @cmd: watchdog command
* @arg: argument pointer
@@ -229,13 +233,14 @@ size_t count, loff_t *ppos)
* according to their available features.
*/

-static int eurwdt_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
+static long eurwdt_ioctl(struct file *file,
+ unsigned int cmd, unsigned long arg)
{
void __user *argp = (void __user *)arg;
int __user *p = argp;
static struct watchdog_info ident = {
- .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
+ .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT
+ | WDIOF_MAGICCLOSE,
.firmware_version = 1,
.identity = "WDT Eurotech CPU-1220/1410",
};
@@ -243,7 +248,7 @@ static int eurwdt_ioctl(struct inode *inode, struct file *file,
int time;
int options, retval = -EINVAL;

- switch(cmd) {
+ switch (cmd) {
default:
return -ENOTTY;

@@ -255,7 +260,9 @@ static int eurwdt_ioctl(struct inode *inode, struct file *file,
return put_user(0, p);

case WDIOC_KEEPALIVE:
+ spin_lock(&eurwdt_lock);
eurwdt_ping();
+ spin_unlock(&eurwdt_lock);
return 0;

case WDIOC_SETTIMEOUT:
@@ -266,8 +273,10 @@ static int eurwdt_ioctl(struct inode *inode, struct file *file,
if (time < 0 || time > 255)
return -EINVAL;

+ spin_lock(&eurwdt_lock);
eurwdt_timeout = time;
eurwdt_set_timeout(time);
+ spin_unlock(&eurwdt_lock);
/* Fall */

case WDIOC_GETTIMEOUT:
@@ -276,6 +285,7 @@ static int eurwdt_ioctl(struct inode *inode, struct file *file,
case WDIOC_SETOPTIONS:
if (get_user(options, p))
return -EFAULT;
+ spin_lock(&eurwdt_lock);
if (options & WDIOS_DISABLECARD) {
eurwdt_disable_timer();
retval = 0;
@@ -285,6 +295,7 @@ static int eurwdt_ioctl(struct inode *inode, struct file *file,
eurwdt_ping();
retval = 0;
}
+ spin_unlock(&eurwdt_lock);
return retval;
}
}
@@ -322,10 +333,11 @@ static int eurwdt_open(struct inode *inode, struct file *file)

static int eurwdt_release(struct inode *inode, struct file *file)
{
- if (eur_expect_close == 42) {
+ if (eur_expect_close == 42)
eurwdt_disable_timer();
- } else {
- printk(KERN_CRIT "eurwdt: Unexpected close, not stopping watchdog!\n");
+ else {
+ printk(KERN_CRIT
+ "eurwdt: Unexpected close, not stopping watchdog!\n");
eurwdt_ping();
}
clear_bit(0, &eurwdt_is_open);
@@ -362,11 +374,11 @@ static int eurwdt_notify_sys(struct notifier_block *this, unsigned long code,

static const struct file_operations eurwdt_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .write = eurwdt_write,
- .ioctl = eurwdt_ioctl,
- .open = eurwdt_open,
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .write = eurwdt_write,
+ .unlocked_ioctl = eurwdt_ioctl,
+ .open = eurwdt_open,
.release = eurwdt_release,
};

@@ -419,7 +431,7 @@ static int __init eurwdt_init(void)
int ret;

ret = request_irq(irq, eurwdt_interrupt, IRQF_DISABLED, "eurwdt", NULL);
- if(ret) {
+ if (ret) {
printk(KERN_ERR "eurwdt: IRQ %d is not free.\n", irq);
goto out;
}
@@ -432,10 +444,13 @@ static int __init eurwdt_init(void)

ret = register_reboot_notifier(&eurwdt_notifier);
if (ret) {
- printk(KERN_ERR "eurwdt: can't register reboot notifier (err=%d)\n", ret);
+ printk(KERN_ERR
+ "eurwdt: can't register reboot notifier (err=%d)\n", ret);
goto outreg;
}

+ spin_lock_init(&eurwdt_lock);
+
ret = misc_register(&eurwdt_miscdev);
if (ret) {
printk(KERN_ERR "eurwdt: can't misc_register on minor=%d\n",