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author | Alan Cox <alan@redhat.com> | 2008-05-19 14:04:57 +0100 |
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committer | Wim Van Sebroeck <wim@iguana.be> | 2008-05-27 15:22:43 +0000 |
commit | 173d95bc2e68baf73eb89fb9ef1cc63a66f581a5 (patch) | |
tree | 45cdc517f96a9574b54224f2a8fc9ff2c15284f4 /drivers/watchdog/alim1535_wdt.c | |
parent | b6b4d9b8d07e34f745871d3109c84894db29041b (diff) | |
download | linux-3.10-173d95bc2e68baf73eb89fb9ef1cc63a66f581a5.tar.gz linux-3.10-173d95bc2e68baf73eb89fb9ef1cc63a66f581a5.tar.bz2 linux-3.10-173d95bc2e68baf73eb89fb9ef1cc63a66f581a5.zip |
[WATCHDOG 03/57] ali: watchdog locking and style
Clean up and check locking
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog/alim1535_wdt.c')
-rw-r--r-- | drivers/watchdog/alim1535_wdt.c | 186 |
1 files changed, 91 insertions, 95 deletions
diff --git a/drivers/watchdog/alim1535_wdt.c b/drivers/watchdog/alim1535_wdt.c index 2b1fbdb2fcf..88760cb5ec1 100644 --- a/drivers/watchdog/alim1535_wdt.c +++ b/drivers/watchdog/alim1535_wdt.c @@ -19,8 +19,8 @@ #include <linux/fs.h> #include <linux/pci.h> -#include <asm/uaccess.h> -#include <asm/io.h> +#include <linux/uaccess.h> +#include <linux/io.h> #define WATCHDOG_NAME "ALi_M1535" #define PFX WATCHDOG_NAME ": " @@ -30,17 +30,21 @@ static unsigned long ali_is_open; static char ali_expect_release; static struct pci_dev *ali_pci; -static u32 ali_timeout_bits; /* stores the computed timeout */ +static u32 ali_timeout_bits; /* stores the computed timeout */ static DEFINE_SPINLOCK(ali_lock); /* Guards the hardware */ /* module parameters */ static int timeout = WATCHDOG_TIMEOUT; 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; 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 @@ -103,15 +107,16 @@ static void ali_keepalive(void) static int ali_settimer(int t) { - if(t < 0) + if (t < 0) return -EINVAL; - else if(t < 60) + else if (t < 60) ali_timeout_bits = t|(1<<6); - else if(t < 3600) + else if (t < 3600) ali_timeout_bits = (t/60)|(1<<7); - else if(t < 18000) + else if (t < 18000) ali_timeout_bits = (t/300)|(1<<6)|(1<<7); - else return -EINVAL; + else + return -EINVAL; timeout = t; return 0; @@ -134,21 +139,22 @@ static int ali_settimer(int t) */ static ssize_t ali_write(struct file *file, const char __user *data, - size_t len, loff_t * ppos) + size_t len, loff_t *ppos) { /* See if we got the magic character 'V' and reload the timer */ if (len) { if (!nowayout) { size_t i; - /* note: just in case someone wrote the magic character - * five months ago... */ + /* note: just in case someone wrote the + magic character five months ago... */ 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++) { char c; - if(get_user(c, data+i)) + if (get_user(c, data+i)) return -EFAULT; if (c == 'V') ali_expect_release = 42; @@ -163,7 +169,6 @@ static ssize_t ali_write(struct file *file, const char __user *data, /* * ali_ioctl - handle watchdog ioctls - * @inode: VFS inode * @file: VFS file pointer * @cmd: ioctl number * @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 */ -static int ali_ioctl(struct inode *inode, struct file *file, - unsigned int cmd, unsigned long arg) +static long ali_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { void __user *argp = (void __user *)arg; int __user *p = argp; @@ -186,57 +190,45 @@ static int ali_ioctl(struct inode *inode, struct file *file, }; switch (cmd) { - case WDIOC_GETSUPPORT: - return copy_to_user(argp, &ident, - sizeof (ident)) ? -EFAULT : 0; - - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - return put_user(0, p); - - case WDIOC_KEEPALIVE: - ali_keepalive(); - return 0; - - case WDIOC_SETOPTIONS: - { - int new_options, retval = -EINVAL; - - if (get_user (new_options, p)) - return -EFAULT; - - if (new_options & WDIOS_DISABLECARD) { - ali_stop(); - retval = 0; - } - - if (new_options & WDIOS_ENABLECARD) { - ali_start(); - retval = 0; - } + case WDIOC_GETSUPPORT: + return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; - return retval; + case WDIOC_GETSTATUS: + case WDIOC_GETBOOTSTATUS: + return put_user(0, p); + case WDIOC_KEEPALIVE: + ali_keepalive(); + return 0; + case WDIOC_SETOPTIONS: + { + int new_options, retval = -EINVAL; + + if (get_user(new_options, p)) + return -EFAULT; + if (new_options & WDIOS_DISABLECARD) { + ali_stop(); + retval = 0; } - - case WDIOC_SETTIMEOUT: - { - int new_timeout; - - if (get_user(new_timeout, p)) - return -EFAULT; - - if (ali_settimer(new_timeout)) - return -EINVAL; - - ali_keepalive(); - /* Fall */ + if (new_options & WDIOS_ENABLECARD) { + ali_start(); + retval = 0; } - - case WDIOC_GETTIMEOUT: - return put_user(timeout, p); - - default: - return -ENOTTY; + return retval; + } + case WDIOC_SETTIMEOUT: + { + int new_timeout; + if (get_user(new_timeout, p)) + return -EFAULT; + if (ali_settimer(new_timeout)) + return -EINVAL; + ali_keepalive(); + /* Fall */ + } + case WDIOC_GETTIMEOUT: + return put_user(timeout, p); + default: + return -ENOTTY; } } @@ -274,10 +266,11 @@ static int ali_release(struct inode *inode, struct file *file) /* * Shut off the timer. */ - if (ali_expect_release == 42) { + if (ali_expect_release == 42) ali_stop(); - } else { - printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); + else { + printk(KERN_CRIT PFX + "Unexpected close, not stopping watchdog!\n"); ali_keepalive(); } 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) { - /* Turn the WDT off */ - ali_stop(); - } - + if (code == SYS_DOWN || code == SYS_HALT) + ali_stop(); /* Turn the WDT off */ return NOTIFY_DONE; } @@ -340,10 +331,10 @@ static int __init ali_find_watchdog(void) /* Check for the a 7101 PMU */ pdev = pci_get_device(PCI_VENDOR_ID_AL, 0x7101, NULL); - if(pdev == NULL) + if (pdev == NULL) return -ENODEV; - if(pci_enable_device(pdev)) { + if (pci_enable_device(pdev)) { pci_dev_put(pdev); return -EIO; } @@ -355,9 +346,12 @@ static int __init ali_find_watchdog(void) */ pci_read_config_dword(pdev, 0xCC, &wdog); - wdog &= ~0x3F; /* Timer bits */ - wdog &= ~((1<<27)|(1<<26)|(1<<25)|(1<<24)); /* Issued events */ - wdog &= ~((1<<16)|(1<<13)|(1<<12)|(1<<11)|(1<<10)|(1<<9)); /* No monitor bits */ + /* Timer bits */ + wdog &= ~0x3F; + /* 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); @@ -369,12 +363,12 @@ static int __init ali_find_watchdog(void) */ static const struct file_operations ali_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = ali_write, - .ioctl = ali_ioctl, - .open = ali_open, - .release = ali_release, + .owner = THIS_MODULE, + .llseek = no_llseek, + .write = ali_write, + .unlocked_ioctl = ali_ioctl, + .open = ali_open, + .release = ali_release, }; static struct miscdevice ali_miscdev = { @@ -399,15 +393,16 @@ static int __init watchdog_init(void) int ret; /* Check whether or not the hardware watchdog is there */ - if (ali_find_watchdog() != 0) { + if (ali_find_watchdog() != 0) 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) { timeout = WATCHDOG_TIMEOUT; - printk(KERN_INFO PFX "timeout value must be 0<timeout<18000, using %d\n", - timeout); + printk(KERN_INFO PFX + "timeout value must be 0 < timeout < 18000, using %d\n", + timeout); } /* Calculate the watchdog's timeout */ @@ -415,15 +410,16 @@ static int __init watchdog_init(void) ret = register_reboot_notifier(&ali_notifier); if (ret != 0) { - printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", - ret); + printk(KERN_ERR PFX + "cannot register reboot notifier (err=%d)\n", ret); goto out; } ret = misc_register(&ali_miscdev); if (ret != 0) { - printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", - WATCHDOG_MINOR, ret); + printk(KERN_ERR PFX + "cannot register miscdev on minor=%d (err=%d)\n", + WATCHDOG_MINOR, ret); goto unreg_reboot; } |