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Subject[PATCH 48/57] txx9: Fix locking, switch to unlocked_ioctl
Date
From: Alan Cox <alan@redhat.com>


---
drivers/watchdog/txx9wdt.c | 31 +++++++++++++++++++------------
1 files changed, 19 insertions(+), 12 deletions(-)

diff --git a/drivers/watchdog/txx9wdt.c b/drivers/watchdog/txx9wdt.c
index 57cefef..b729cc4 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 = {


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