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[WATCHDOG 03/57] ali: watchdog locking and style

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Clean up and check locking

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Alan Cox 2008-05-19 14:04:57 +01:00 committed by Wim Van Sebroeck
parent b6b4d9b8d0
commit 173d95bc2e
2 changed files with 208 additions and 200 deletions
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84
drivers/watchdog/alim1535_wdt.c
View File

@ -19,8 +19,8 @@
#include <linux/fs.h> #include <linux/fs.h>
#include <linux/pci.h> #include <linux/pci.h>
#include <asm/uaccess.h> #include <linux/uaccess.h>
#include <asm/io.h> #include <linux/io.h>
#define WATCHDOG_NAME "ALi_M1535" #define WATCHDOG_NAME "ALi_M1535"
#define PFX WATCHDOG_NAME ": " #define PFX WATCHDOG_NAME ": "
@ -36,11 +36,15 @@ static DEFINE_SPINLOCK(ali_lock); /* Guards the hardware */
/* module parameters */ /* module parameters */
static int timeout = WATCHDOG_TIMEOUT; static int timeout = WATCHDOG_TIMEOUT;
module_param(timeout, int, 0); module_param(timeout, int, 0);
MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. (0<timeout<18000, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")"); MODULE_PARM_DESC(timeout,
"Watchdog timeout in seconds. (0 < timeout < 18000, default="
__MODULE_STRING(WATCHDOG_TIMEOUT) ")");
static int nowayout = WATCHDOG_NOWAYOUT; static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0); 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) ")");
/* /*
* ali_start - start watchdog countdown * ali_start - start watchdog countdown
@ -111,7 +115,8 @@ static int ali_settimer(int t)
ali_timeout_bits = (t/60)|(1<<7); ali_timeout_bits = (t/60)|(1<<7);
else if (t < 18000) else if (t < 18000)
ali_timeout_bits = (t/300)|(1<<6)|(1<<7); ali_timeout_bits = (t/300)|(1<<6)|(1<<7);
else return -EINVAL; else
return -EINVAL;
timeout = t; timeout = t;
return 0; return 0;
@ -141,11 +146,12 @@ static ssize_t ali_write(struct file *file, const char __user *data,
if (!nowayout) { if (!nowayout) {
size_t i; size_t i;
/* note: just in case someone wrote the magic character /* note: just in case someone wrote the
* five months ago... */ magic character five months ago... */
ali_expect_release = 0; ali_expect_release = 0;
/* scan to see whether or not we got the magic character */ /* scan to see whether or not we got
the magic character */
for (i = 0; i != len; i++) { for (i = 0; i != len; i++) {
char c; char c;
if (get_user(c, data+i)) if (get_user(c, data+i))
@ -163,7 +169,6 @@ static ssize_t ali_write(struct file *file, const char __user *data,
/* /*
* ali_ioctl - handle watchdog ioctls * ali_ioctl - handle watchdog ioctls
* @inode: VFS inode
* @file: VFS file pointer * @file: VFS file pointer
* @cmd: ioctl number * @cmd: ioctl number
* @arg: arguments to the ioctl * @arg: arguments to the ioctl
@ -172,8 +177,7 @@ static ssize_t ali_write(struct file *file, const char __user *data,
* we want an extension to enable irq ack monitoring and the like * we want an extension to enable irq ack monitoring and the like
*/ */
static int ali_ioctl(struct inode *inode, struct file *file, static long ali_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
unsigned int cmd, unsigned long arg)
{ {
void __user *argp = (void __user *)arg; void __user *argp = (void __user *)arg;
int __user *p = argp; int __user *p = argp;
@ -187,54 +191,42 @@ static int ali_ioctl(struct inode *inode, struct file *file,
switch (cmd) { switch (cmd) {
case WDIOC_GETSUPPORT: case WDIOC_GETSUPPORT:
return copy_to_user(argp, &ident, return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
sizeof (ident)) ? -EFAULT : 0;
case WDIOC_GETSTATUS: case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS: case WDIOC_GETBOOTSTATUS:
return put_user(0, p); return put_user(0, p);
case WDIOC_KEEPALIVE: case WDIOC_KEEPALIVE:
ali_keepalive(); ali_keepalive();
return 0; return 0;
case WDIOC_SETOPTIONS: case WDIOC_SETOPTIONS:
{ {
int new_options, retval = -EINVAL; int new_options, retval = -EINVAL;
if (get_user(new_options, p)) if (get_user(new_options, p))
return -EFAULT; return -EFAULT;
if (new_options & WDIOS_DISABLECARD) { if (new_options & WDIOS_DISABLECARD) {
ali_stop(); ali_stop();
retval = 0; retval = 0;
} }
if (new_options & WDIOS_ENABLECARD) { if (new_options & WDIOS_ENABLECARD) {
ali_start(); ali_start();
retval = 0; retval = 0;
} }
return retval; return retval;
} }
case WDIOC_SETTIMEOUT: case WDIOC_SETTIMEOUT:
{ {
int new_timeout; int new_timeout;
if (get_user(new_timeout, p)) if (get_user(new_timeout, p))
return -EFAULT; return -EFAULT;
if (ali_settimer(new_timeout)) if (ali_settimer(new_timeout))
return -EINVAL; return -EINVAL;
ali_keepalive(); ali_keepalive();
/* Fall */ /* Fall */
} }
case WDIOC_GETTIMEOUT: case WDIOC_GETTIMEOUT:
return put_user(timeout, p); return put_user(timeout, p);
default: default:
return -ENOTTY; return -ENOTTY;
} }
@ -274,10 +266,11 @@ static int ali_release(struct inode *inode, struct file *file)
/* /*
* Shut off the timer. * Shut off the timer.
*/ */
if (ali_expect_release == 42) { if (ali_expect_release == 42)
ali_stop(); ali_stop();
} else { else {
printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); printk(KERN_CRIT PFX
"Unexpected close, not stopping watchdog!\n");
ali_keepalive(); ali_keepalive();
} }
clear_bit(0, &ali_is_open); clear_bit(0, &ali_is_open);
@ -292,13 +285,11 @@ static int ali_release(struct inode *inode, struct file *file)
*/ */
static int ali_notify_sys(struct notifier_block *this, unsigned long code, void *unused) static int ali_notify_sys(struct notifier_block *this,
unsigned long code, void *unused)
{ {
if (code==SYS_DOWN || code==SYS_HALT) { if (code == SYS_DOWN || code == SYS_HALT)
/* Turn the WDT off */ ali_stop(); /* Turn the WDT off */
ali_stop();
}
return NOTIFY_DONE; return NOTIFY_DONE;
} }
@ -355,9 +346,12 @@ static int __init ali_find_watchdog(void)
*/ */
pci_read_config_dword(pdev, 0xCC, &wdog); pci_read_config_dword(pdev, 0xCC, &wdog);
wdog &= ~0x3F; /* Timer bits */ /* Timer bits */
wdog &= ~((1<<27)|(1<<26)|(1<<25)|(1<<24)); /* Issued events */ wdog &= ~0x3F;
wdog &= ~((1<<16)|(1<<13)|(1<<12)|(1<<11)|(1<<10)|(1<<9)); /* No monitor bits */ /* Issued events */
wdog &= ~((1<<27)|(1<<26)|(1<<25)|(1<<24));
/* No monitor bits */
wdog &= ~((1<<16)|(1<<13)|(1<<12)|(1<<11)|(1<<10)|(1<<9));
pci_write_config_dword(pdev, 0xCC, wdog); pci_write_config_dword(pdev, 0xCC, wdog);
@ -372,7 +366,7 @@ static const struct file_operations ali_fops = {
.owner = THIS_MODULE, .owner = THIS_MODULE,
.llseek = no_llseek, .llseek = no_llseek,
.write = ali_write, .write = ali_write,
.ioctl = ali_ioctl, .unlocked_ioctl = ali_ioctl,
.open = ali_open, .open = ali_open,
.release = ali_release, .release = ali_release,
}; };
@ -399,14 +393,15 @@ static int __init watchdog_init(void)
int ret; int ret;
/* Check whether or not the hardware watchdog is there */ /* Check whether or not the hardware watchdog is there */
if (ali_find_watchdog() != 0) { if (ali_find_watchdog() != 0)
return -ENODEV; return -ENODEV;
}
/* Check that the timeout value is within it's range ; if not reset to the default */ /* Check that the timeout value is within it's range;
if not reset to the default */
if (timeout < 1 || timeout >= 18000) { if (timeout < 1 || timeout >= 18000) {
timeout = WATCHDOG_TIMEOUT; timeout = WATCHDOG_TIMEOUT;
printk(KERN_INFO PFX "timeout value must be 0<timeout<18000, using %d\n", printk(KERN_INFO PFX
"timeout value must be 0 < timeout < 18000, using %d\n",
timeout); timeout);
} }
@ -415,14 +410,15 @@ static int __init watchdog_init(void)
ret = register_reboot_notifier(&ali_notifier); ret = register_reboot_notifier(&ali_notifier);
if (ret != 0) { if (ret != 0) {
printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", printk(KERN_ERR PFX
ret); "cannot register reboot notifier (err=%d)\n", ret);
goto out; goto out;
} }
ret = misc_register(&ali_miscdev); ret = misc_register(&ali_miscdev);
if (ret != 0) { if (ret != 0) {
printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", printk(KERN_ERR PFX
"cannot register miscdev on minor=%d (err=%d)\n",
WATCHDOG_MINOR, ret); WATCHDOG_MINOR, ret);
goto unreg_reboot; goto unreg_reboot;
} }

116
drivers/watchdog/alim7101_wdt.c
View File

@ -32,8 +32,8 @@
#include <linux/fs.h> #include <linux/fs.h>
#include <linux/pci.h> #include <linux/pci.h>
#include <asm/io.h> #include <linux/io.h>
#include <asm/uaccess.h> #include <linux/uaccess.h>
#include <asm/system.h> #include <asm/system.h>
#define OUR_NAME "alim7101_wdt" #define OUR_NAME "alim7101_wdt"
@ -60,13 +60,17 @@
*/ */
#define WATCHDOG_TIMEOUT 30 /* 30 sec default timeout */ #define WATCHDOG_TIMEOUT 30 /* 30 sec default timeout */
static int timeout = WATCHDOG_TIMEOUT; /* in seconds, will be multiplied by HZ to get seconds to wait for a ping */ /* in seconds, will be multiplied by HZ to get seconds to wait for a ping */
static int timeout = WATCHDOG_TIMEOUT;
module_param(timeout, int, 0); module_param(timeout, int, 0);
MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. (1<=timeout<=3600, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")"); MODULE_PARM_DESC(timeout,
"Watchdog timeout in seconds. (1<=timeout<=3600, default="
__MODULE_STRING(WATCHDOG_TIMEOUT) ")");
static int use_gpio = 0; /* Use the pic (for a1d revision alim7101) */ static int use_gpio; /* Use the pic (for a1d revision alim7101) */
module_param(use_gpio, int, 0); module_param(use_gpio, int, 0);
MODULE_PARM_DESC(use_gpio, "Use the gpio watchdog. (required by old cobalt boards)"); MODULE_PARM_DESC(use_gpio,
"Use the gpio watchdog (required by old cobalt boards).");
static void wdt_timer_ping(unsigned long); static void wdt_timer_ping(unsigned long);
static DEFINE_TIMER(timer, wdt_timer_ping, 0, 1); static DEFINE_TIMER(timer, wdt_timer_ping, 0, 1);
@ -77,7 +81,8 @@ static struct pci_dev *alim7101_pmu;
static int nowayout = WATCHDOG_NOWAYOUT; static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0); module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" MODULE_PARM_DESC(nowayout,
"Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
/* /*
@ -91,21 +96,24 @@ static void wdt_timer_ping(unsigned long data)
*/ */
char tmp; char tmp;
if(time_before(jiffies, next_heartbeat)) if (time_before(jiffies, next_heartbeat)) {
{
/* Ping the WDT (this is actually a disarm/arm sequence) */ /* Ping the WDT (this is actually a disarm/arm sequence) */
pci_read_config_byte(alim7101_pmu, 0x92, &tmp); pci_read_config_byte(alim7101_pmu, 0x92, &tmp);
pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp & ~ALI_WDT_ARM)); pci_write_config_byte(alim7101_pmu,
pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp | ALI_WDT_ARM)); ALI_7101_WDT, (tmp & ~ALI_WDT_ARM));
pci_write_config_byte(alim7101_pmu,
ALI_7101_WDT, (tmp | ALI_WDT_ARM));
if (use_gpio) { if (use_gpio) {
pci_read_config_byte(alim7101_pmu, ALI_7101_GPIO_O, &tmp); pci_read_config_byte(alim7101_pmu,
pci_write_config_byte(alim7101_pmu, ALI_7101_GPIO_O, tmp ALI_7101_GPIO_O, &tmp);
| 0x20); pci_write_config_byte(alim7101_pmu,
pci_write_config_byte(alim7101_pmu, ALI_7101_GPIO_O, tmp ALI_7101_GPIO_O, tmp | 0x20);
& ~0x20); pci_write_config_byte(alim7101_pmu,
ALI_7101_GPIO_O, tmp & ~0x20);
} }
} else { } else {
printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n"); printk(KERN_WARNING PFX
"Heartbeat lost! Will not ping the watchdog\n");
} }
/* Re-set the timer interval */ /* Re-set the timer interval */
mod_timer(&timer, jiffies + WDT_INTERVAL); mod_timer(&timer, jiffies + WDT_INTERVAL);
@ -121,17 +129,23 @@ static void wdt_change(int writeval)
pci_read_config_byte(alim7101_pmu, ALI_7101_WDT, &tmp); pci_read_config_byte(alim7101_pmu, ALI_7101_WDT, &tmp);
if (writeval == WDT_ENABLE) { if (writeval == WDT_ENABLE) {
pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp | ALI_WDT_ARM)); pci_write_config_byte(alim7101_pmu,
ALI_7101_WDT, (tmp | ALI_WDT_ARM));
if (use_gpio) { if (use_gpio) {
pci_read_config_byte(alim7101_pmu, ALI_7101_GPIO_O, &tmp); pci_read_config_byte(alim7101_pmu,
pci_write_config_byte(alim7101_pmu, ALI_7101_GPIO_O, tmp & ~0x20); ALI_7101_GPIO_O, &tmp);
pci_write_config_byte(alim7101_pmu,
ALI_7101_GPIO_O, tmp & ~0x20);
} }
} else { } else {
pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp & ~ALI_WDT_ARM)); pci_write_config_byte(alim7101_pmu,
ALI_7101_WDT, (tmp & ~ALI_WDT_ARM));
if (use_gpio) { if (use_gpio) {
pci_read_config_byte(alim7101_pmu, ALI_7101_GPIO_O, &tmp); pci_read_config_byte(alim7101_pmu,
pci_write_config_byte(alim7101_pmu, ALI_7101_GPIO_O, tmp | 0x20); ALI_7101_GPIO_O, &tmp);
pci_write_config_byte(alim7101_pmu,
ALI_7101_GPIO_O, tmp | 0x20);
} }
} }
} }
@ -169,7 +183,8 @@ static void wdt_keepalive(void)
* /dev/watchdog handling * /dev/watchdog handling
*/ */
static ssize_t fop_write(struct file * file, const char __user * buf, size_t count, loff_t * ppos) static ssize_t fop_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{ {
/* See if we got the magic character 'V' and reload the timer */ /* See if we got the magic character 'V' and reload the timer */
if (count) { if (count) {
@ -211,26 +226,26 @@ static int fop_close(struct inode * inode, struct file * file)
wdt_turnoff(); wdt_turnoff();
else { else {
/* wim: shouldn't there be a: del_timer(&timer); */ /* wim: shouldn't there be a: del_timer(&timer); */
printk(KERN_CRIT PFX "device file closed unexpectedly. Will not stop the WDT!\n"); printk(KERN_CRIT PFX
"device file closed unexpectedly. Will not stop the WDT!\n");
} }
clear_bit(0, &wdt_is_open); clear_bit(0, &wdt_is_open);
wdt_expect_close = 0; wdt_expect_close = 0;
return 0; return 0;
} }
static int fop_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) static long fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{ {
void __user *argp = (void __user *)arg; void __user *argp = (void __user *)arg;
int __user *p = argp; int __user *p = argp;
static struct watchdog_info ident = static struct watchdog_info ident = {
{ .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT
.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, | WDIOF_MAGICCLOSE,
.firmware_version = 1, .firmware_version = 1,
.identity = "ALiM7101", .identity = "ALiM7101",
}; };
switch(cmd) switch (cmd) {
{
case WDIOC_GETSUPPORT: case WDIOC_GETSUPPORT:
return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
case WDIOC_GETSTATUS: case WDIOC_GETSTATUS:
@ -245,17 +260,14 @@ static int fop_ioctl(struct inode *inode, struct file *file, unsigned int cmd, u
if (get_user(new_options, p)) if (get_user(new_options, p))
return -EFAULT; return -EFAULT;
if (new_options & WDIOS_DISABLECARD) { if (new_options & WDIOS_DISABLECARD) {
wdt_turnoff(); wdt_turnoff();
retval = 0; retval = 0;
} }
if (new_options & WDIOS_ENABLECARD) { if (new_options & WDIOS_ENABLECARD) {
wdt_startup(); wdt_startup();
retval = 0; retval = 0;
} }
return retval; return retval;
} }
case WDIOC_SETTIMEOUT: case WDIOC_SETTIMEOUT:
@ -264,10 +276,9 @@ static int fop_ioctl(struct inode *inode, struct file *file, unsigned int cmd, u
if (get_user(new_timeout, p)) if (get_user(new_timeout, p))
return -EFAULT; return -EFAULT;
/* arbitrary upper limit */
if(new_timeout < 1 || new_timeout > 3600) /* arbitrary upper limit */ if (new_timeout < 1 || new_timeout > 3600)
return -EINVAL; return -EINVAL;
timeout = new_timeout; timeout = new_timeout;
wdt_keepalive(); wdt_keepalive();
/* Fall through */ /* Fall through */
@ -285,7 +296,7 @@ static const struct file_operations wdt_fops = {
.write = fop_write, .write = fop_write,
.open = fop_open, .open = fop_open,
.release = fop_close, .release = fop_close,
.ioctl= fop_ioctl, .unlocked_ioctl = fop_ioctl,
}; };
static struct miscdevice wdt_miscdev = { static struct miscdevice wdt_miscdev = {
@ -298,16 +309,17 @@ static struct miscdevice wdt_miscdev = {
* Notifier for system down * Notifier for system down
*/ */
static int wdt_notify_sys(struct notifier_block *this, unsigned long code, void *unused) static int wdt_notify_sys(struct notifier_block *this,
unsigned long code, void *unused)
{ {
if (code == SYS_DOWN || code == SYS_HALT) if (code == SYS_DOWN || code == SYS_HALT)
wdt_turnoff(); wdt_turnoff();
if (code == SYS_RESTART) { if (code == SYS_RESTART) {
/* /*
* Cobalt devices have no way of rebooting themselves other than * Cobalt devices have no way of rebooting themselves other
* getting the watchdog to pull reset, so we restart the watchdog on * than getting the watchdog to pull reset, so we restart the
* reboot with no heartbeat * watchdog on reboot with no heartbeat
*/ */
wdt_change(WDT_ENABLE); wdt_change(WDT_ENABLE);
printk(KERN_INFO PFX "Watchdog timer is now enabled with no heartbeat - should reboot in ~1 second.\n"); printk(KERN_INFO PFX "Watchdog timer is now enabled with no heartbeat - should reboot in ~1 second.\n");
@ -320,8 +332,7 @@ static int wdt_notify_sys(struct notifier_block *this, unsigned long code, void
* turn the timebomb registers off. * turn the timebomb registers off.
*/ */
static struct notifier_block wdt_notifier= static struct notifier_block wdt_notifier = {
{
.notifier_call = wdt_notify_sys, .notifier_call = wdt_notify_sys,
}; };
@ -354,7 +365,8 @@ static int __init alim7101_wdt_init(void)
ali1543_south = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, ali1543_south = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533,
NULL); NULL);
if (!ali1543_south) { if (!ali1543_south) {
printk(KERN_INFO PFX "ALi 1543 South-Bridge not present - WDT not set\n"); printk(KERN_INFO PFX
"ALi 1543 South-Bridge not present - WDT not set\n");
goto err_out; goto err_out;
} }
pci_read_config_byte(ali1543_south, 0x5e, &tmp); pci_read_config_byte(ali1543_south, 0x5e, &tmp);
@ -370,17 +382,18 @@ static int __init alim7101_wdt_init(void)
goto err_out; goto err_out;
} }
if(timeout < 1 || timeout > 3600) /* arbitrary upper limit */ if (timeout < 1 || timeout > 3600) {
{ /* arbitrary upper limit */
timeout = WATCHDOG_TIMEOUT; timeout = WATCHDOG_TIMEOUT;
printk(KERN_INFO PFX "timeout value must be 1<=x<=3600, using %d\n", printk(KERN_INFO PFX
"timeout value must be 1 <= x <= 3600, using %d\n",
timeout); timeout);
} }
rc = register_reboot_notifier(&wdt_notifier); rc = register_reboot_notifier(&wdt_notifier);
if (rc) { if (rc) {
printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", printk(KERN_ERR PFX
rc); "cannot register reboot notifier (err=%d)\n", rc);
goto err_out; goto err_out;
} }
@ -391,9 +404,8 @@ static int __init alim7101_wdt_init(void)
goto err_out_reboot; goto err_out_reboot;
} }
if (nowayout) { if (nowayout)
__module_get(THIS_MODULE); __module_get(THIS_MODULE);
}
printk(KERN_INFO PFX "WDT driver for ALi M7101 initialised. timeout=%d sec (nowayout=%d)\n", printk(KERN_INFO PFX "WDT driver for ALi M7101 initialised. timeout=%d sec (nowayout=%d)\n",
timeout, nowayout); timeout, nowayout);