From: Alan Cox Date: Mon, 19 May 2008 13:07:32 +0000 (+0100) Subject: [WATCHDOG 30/57] omap_wdt: locking, unlocked_ioctl, tidy X-Git-Tag: v2.6.27-rc3~81^2~13^2~27 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=12b9df7d21d0eedfaaee925f8f9c9aafb1cafa2f;p=linux-2.6-omap-h63xx.git [WATCHDOG 30/57] omap_wdt: locking, unlocked_ioctl, tidy Review and switch to unlocked_ioctl Signed-off-by: Alan Cox Signed-off-by: Wim Van Sebroeck --- diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c index 74bc39aa1ce..ccdf069792d 100644 --- a/drivers/watchdog/omap_wdt.c +++ b/drivers/watchdog/omap_wdt.c @@ -41,9 +41,9 @@ #include #include -#include -#include -#include +#include +#include +#include #include @@ -54,11 +54,12 @@ module_param(timer_margin, uint, 0); MODULE_PARM_DESC(timer_margin, "initial watchdog timeout (in seconds)"); static int omap_wdt_users; -static struct clk *armwdt_ck = NULL; -static struct clk *mpu_wdt_ick = NULL; -static struct clk *mpu_wdt_fck = NULL; +static struct clk *armwdt_ck; +static struct clk *mpu_wdt_ick; +static struct clk *mpu_wdt_fck; static unsigned int wdt_trgr_pattern = 0x1234; +static spinlock_t wdt_lock; static void omap_wdt_ping(void) { @@ -174,22 +175,23 @@ static int omap_wdt_release(struct inode *inode, struct file *file) return 0; } -static ssize_t -omap_wdt_write(struct file *file, const char __user *data, +static ssize_t omap_wdt_write(struct file *file, const char __user *data, size_t len, loff_t *ppos) { /* Refresh LOAD_TIME. */ - if (len) + if (len) { + spin_lock(&wdt_lock); omap_wdt_ping(); + spin_unlock(&wdt_lock); + } return len; } -static int -omap_wdt_ioctl(struct inode *inode, struct file *file, - unsigned int cmd, unsigned long arg) +static long omap_wdt_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) { int new_margin; - static struct watchdog_info ident = { + static const struct watchdog_info ident = { .identity = "OMAP Watchdog", .options = WDIOF_SETTIMEOUT, .firmware_version = 0, @@ -211,18 +213,22 @@ omap_wdt_ioctl(struct inode *inode, struct file *file, return put_user(omap_prcm_get_reset_sources(), (int __user *)arg); case WDIOC_KEEPALIVE: + spin_lock(&wdt_lock); omap_wdt_ping(); + spin_unlock(&wdt_lock); return 0; case WDIOC_SETTIMEOUT: if (get_user(new_margin, (int __user *)arg)) return -EFAULT; omap_wdt_adjust_timeout(new_margin); + spin_lock(&wdt_lock); omap_wdt_disable(); omap_wdt_set_timeout(); omap_wdt_enable(); omap_wdt_ping(); + spin_unlock(&wdt_lock); /* Fall */ case WDIOC_GETTIMEOUT: return put_user(timer_margin, (int __user *)arg); @@ -232,7 +238,7 @@ omap_wdt_ioctl(struct inode *inode, struct file *file, static const struct file_operations omap_wdt_fops = { .owner = THIS_MODULE, .write = omap_wdt_write, - .ioctl = omap_wdt_ioctl, + .unlocked_ioctl = omap_wdt_ioctl, .open = omap_wdt_open, .release = omap_wdt_release, }; @@ -373,6 +379,7 @@ static struct platform_driver omap_wdt_driver = { static int __init omap_wdt_init(void) { + spin_lock_init(&wdt_lock); return platform_driver_register(&omap_wdt_driver); }