The patch titled
watchdog: aR7 watchdog
has been removed from the -mm tree. Its filename was
watchdog-ar7-watchdog.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: watchdog: aR7 watchdog
From: Alan Cox <alan@xxxxxxxxxx>
Fix locking
Use unlocked_ioctl
Remove semaphores
Signed-off-by: Alan Cox <alan@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/watchdog/ar7_wdt.c | 29 +++++++++++++++++------------
1 file changed, 17 insertions(+), 12 deletions(-)
diff -puN drivers/watchdog/ar7_wdt.c~watchdog-ar7-watchdog drivers/watchdog/ar7_wdt.c
--- a/drivers/watchdog/ar7_wdt.c~watchdog-ar7-watchdog
+++ a/drivers/watchdog/ar7_wdt.c
@@ -69,7 +69,8 @@ struct ar7_wdt {
u32 prescale;
};
-static struct semaphore open_semaphore;
+static unsigned long wdt_is_open;
+static spinlock_t wdt_lock;
static unsigned expect_close;
/* XXX currently fixed, allows max margin ~68.72 secs */
@@ -154,8 +155,10 @@ static void ar7_wdt_update_margin(int ne
u32 change;
change = new_margin * (ar7_vbus_freq() / prescale_value);
- if (change < 1) change = 1;
- if (change > 0xffff) change = 0xffff;
+ if (change < 1)
+ change = 1;
+ if (change > 0xffff)
+ change = 0xffff;
ar7_wdt_change(change);
margin = change * prescale_value / ar7_vbus_freq();
printk(KERN_INFO DRVNAME
@@ -179,7 +182,7 @@ static void ar7_wdt_disable_wdt(void)
static int ar7_wdt_open(struct inode *inode, struct file *file)
{
/* only allow one at a time */
- if (down_trylock(&open_semaphore))
+ if (test_and_set_bit(0, &wdt_is_open))
return -EBUSY;
ar7_wdt_enable_wdt();
expect_close = 0;
@@ -195,9 +198,7 @@ static int ar7_wdt_release(struct inode
"will not disable the watchdog timer\n");
else if (!nowayout)
ar7_wdt_disable_wdt();
-
- up(&open_semaphore);
-
+ clear_bit(0, &wdt_is_open);
return 0;
}
@@ -222,7 +223,9 @@ static ssize_t ar7_wdt_write(struct file
if (len) {
size_t i;
+ spin_lock(&wdt_lock);
ar7_wdt_kick(1);
+ spin_unlock(&wdt_lock);
expect_close = 0;
for (i = 0; i < len; ++i) {
@@ -237,8 +240,8 @@ static ssize_t ar7_wdt_write(struct file
return len;
}
-static int ar7_wdt_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
+static long ar7_wdt_ioctl(struct file *file,
+ unsigned int cmd, unsigned long arg)
{
static struct watchdog_info ident = {
.identity = LONGNAME,
@@ -269,8 +272,10 @@ static int ar7_wdt_ioctl(struct inode *i
if (new_margin < 1)
return -EINVAL;
+ spin_lock(&wdt_lock);
ar7_wdt_update_margin(new_margin);
ar7_wdt_kick(1);
+ spin_unlock(&wdt_lock);
case WDIOC_GETTIMEOUT:
if (put_user(margin, (int *)arg))
@@ -282,7 +287,7 @@ static int ar7_wdt_ioctl(struct inode *i
static const struct file_operations ar7_wdt_fops = {
.owner = THIS_MODULE,
.write = ar7_wdt_write,
- .ioctl = ar7_wdt_ioctl,
+ .unlocked_ioctl = ar7_wdt_ioctl,
.open = ar7_wdt_open,
.release = ar7_wdt_release,
};
@@ -297,6 +302,8 @@ static int __init ar7_wdt_init(void)
{
int rc;
+ spin_lock_init(&wdt_lock);
+
ar7_wdt_get_regs();
if (!request_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt),
@@ -312,8 +319,6 @@ static int __init ar7_wdt_init(void)
ar7_wdt_prescale(prescale_value);
ar7_wdt_update_margin(margin);
- sema_init(&open_semaphore, 1);
-
rc = register_reboot_notifier(&ar7_wdt_notifier);
if (rc) {
printk(KERN_ERR DRVNAME
_
Patches currently in -mm which might be from alan@xxxxxxxxxx are
origin.patch
linux-next.patch
ia64-hp-sim-simserialc-adapt-to-new-tty-framework.patch
remove-is_tty.patch
mn10300-fix-mn10300s-serial-port-driver-to-get-at-its-tty_struct.patch
hamradio-add-missing-sanity-check-to-tty-operation.patch
git-watchdog.patch
serial-8250_gscc-add-module_license.patch
serial-add-support-for-a-no-name-4-ports-multiserial-card.patch
istallion-remove-unused-variable.patch
stallion-removed-unused-variable.patch
spidev-bkl-removal.patch
rtc-push-the-bkl-down-into-the-driver-ioctl-method.patch
efirtc-push-down-the-bkl.patch
ip2-push-bkl-down-for-the-firmware-interface.patch
mwave-ioctl-bkl-pushdown.patch
rio-push-down-the-bkl-into-the-firmware-ioctl-handler.patch
sx-push-bkl-down-into-the-firmware-ioctl-handler.patch
ixj-push-bkl-into-driver-and-wrap-ioctls.patch
ppdev-wrap-ioctl-handler-in-driver-and-push-lock-down.patch
ds1302-push-down-the-bkl-into-the-driver-ioctl-code.patch
dsp56k-bkl-pushdown.patch
char-mxser-ioctl-cleanup.patch
char-mxser-globals-cleanup.patch
char-mxser-update-documentation.patch
char-mxser-prints-cleanup.patch
char-mxser-remove-predefined-isa-support.patch
char-mxser-various-cleanups.patch
unexport-proc_clear_tty.patch
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