[WATCHDOG 48/57] txx9: Fix locking, switch to unlocked_ioctl

Review and switch to unlocked_ioctl

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 19 insertions, 12 deletions

diff --git a/drivers/watchdog/txx9wdt.c b/drivers/watchdog/txx9wdt.c
index 57cefef27ce3..b729cc447df3 100644
--- a/drivers/watchdog/txx9wdt.c
+++ b/drivers/watchdog/txx9wdt.c
@@ -45,27 +45,34 @@ static unsigned long txx9wdt_alive;
 static int expect_close;
 static struct txx9_tmr_reg __iomem *txx9wdt_reg;
 static struct clk *txx9_imclk;
+static DECLARE_LOCK(txx9_lock);
 
 static void txx9wdt_ping(void)
 {
+        spin_lock(&txx9_lock);
         __raw_writel(TXx9_TMWTMR_TWIE | TXx9_TMWTMR_TWC, &txx9wdt_reg->wtmr);
+        spin_unlock(&txx9_lock);
 }
 
 static void txx9wdt_start(void)
 {
+        spin_lock(&txx9_lock);
         __raw_writel(WD_TIMER_CLK * timeout, &txx9wdt_reg->cpra);
         __raw_writel(WD_TIMER_CCD, &txx9wdt_reg->ccdr);
         __raw_writel(0, &txx9wdt_reg->tisr);    /* clear pending interrupt */
         __raw_writel(TXx9_TMTCR_TCE | TXx9_TMTCR_CCDE | TXx9_TMTCR_TMODE_WDOG,
                      &txx9wdt_reg->tcr);
         __raw_writel(TXx9_TMWTMR_TWIE | TXx9_TMWTMR_TWC, &txx9wdt_reg->wtmr);
+        spin_unlock(&txx9_lock);
 }
 
 static void txx9wdt_stop(void)
 {
+        spin_lock(&txx9_lock);
         __raw_writel(TXx9_TMWTMR_WDIS, &txx9wdt_reg->wtmr);
         __raw_writel(__raw_readl(&txx9wdt_reg->tcr) & ~TXx9_TMTCR_TCE,
                      &txx9wdt_reg->tcr);
+        spin_unlock(&txx9_lock);
 }
 
 static int txx9wdt_open(struct inode *inode, struct file *file)
@@ -120,13 +127,13 @@ static ssize_t txx9wdt_write(struct file *file, const char __user *data,
         return len;
 }
 
-static int txx9wdt_ioctl(struct inode *inode, struct file *file,
-        unsigned int cmd, unsigned long arg)
+static long txx9wdt_ioctl(struct file *file, unsigned int cmd,
+                                                        unsigned long arg)
 {
         void __user *argp = (void __user *)arg;
         int __user *p = argp;
         int new_timeout;
-        static struct watchdog_info ident = {
+        static const struct watchdog_info ident = {
                 .options =              WDIOF_SETTIMEOUT |
                                         WDIOF_KEEPALIVEPING |
                                         WDIOF_MAGICCLOSE,
@@ -168,18 +175,18 @@ static int txx9wdt_notify_sys(struct notifier_block *this, unsigned long code,
 }
 
 static const struct file_operations txx9wdt_fops = {
-        .owner =        THIS_MODULE,
-        .llseek =       no_llseek,
-        .write =        txx9wdt_write,
-        .ioctl =        txx9wdt_ioctl,
-        .open =         txx9wdt_open,
-        .release =      txx9wdt_release,
+        .owner          =       THIS_MODULE,
+        .llseek         =       no_llseek,
+        .write          =       txx9wdt_write,
+        .unlocked_ioctl =       txx9wdt_ioctl,
+        .open           =       txx9wdt_open,
+        .release        =       txx9wdt_release,
 };
 
 static struct miscdevice txx9wdt_miscdev = {
-        .minor =        WATCHDOG_MINOR,
-        .name =         "watchdog",
-        .fops =         &txx9wdt_fops,
+        .minor  =       WATCHDOG_MINOR,
+        .name   =       "watchdog",
+        .fops   =       &txx9wdt_fops,
 };
 
 static struct notifier_block txx9wdt_notifier = {