* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
-#include <linux/config.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/ipmi.h>
#include <linux/watchdog.h>
#include <linux/miscdevice.h>
#include <linux/init.h>
+#include <linux/completion.h>
#include <linux/rwsem.h>
#include <linux/errno.h>
#include <asm/uaccess.h>
{
action_fn fn = (action_fn) kp->arg;
int rv = 0;
- const char *end;
- char valcp[16];
- int len;
-
- /* Truncate leading and trailing spaces. */
- while (isspace(*val))
- val++;
- end = val + strlen(val) - 1;
- while ((end >= val) && isspace(*end))
- end--;
- len = end - val + 1;
- if (len > sizeof(valcp) - 1)
- return -EINVAL;
- memcpy(valcp, val, len);
- valcp[len] = '\0';
+ char *dup, *s;
+
+ dup = kstrdup(val, GFP_KERNEL);
+ if (!dup)
+ return -ENOMEM;
+
+ s = strstrip(dup);
down_read(®ister_sem);
- rv = fn(valcp, NULL);
+ rv = fn(s, NULL);
if (rv)
goto out_unlock;
out_unlock:
up_read(®ister_sem);
+ kfree(dup);
return rv;
}
static void panic_halt_ipmi_heartbeat(void);
-/* We use a semaphore to make sure that only one thing can send a set
+/* We use a mutex to make sure that only one thing can send a set
timeout at one time, because we only have one copy of the data.
- The semaphore is claimed when the set_timeout is sent and freed
+ The mutex is claimed when the set_timeout is sent and freed
when both messages are free. */
static atomic_t set_timeout_tofree = ATOMIC_INIT(0);
-static DECLARE_MUTEX(set_timeout_lock);
+static DEFINE_MUTEX(set_timeout_lock);
+static DECLARE_COMPLETION(set_timeout_wait);
static void set_timeout_free_smi(struct ipmi_smi_msg *msg)
{
if (atomic_dec_and_test(&set_timeout_tofree))
- up(&set_timeout_lock);
+ complete(&set_timeout_wait);
}
static void set_timeout_free_recv(struct ipmi_recv_msg *msg)
{
if (atomic_dec_and_test(&set_timeout_tofree))
- up(&set_timeout_lock);
+ complete(&set_timeout_wait);
}
static struct ipmi_smi_msg set_timeout_smi_msg =
{
/* We can only send one of these at a time. */
- down(&set_timeout_lock);
+ mutex_lock(&set_timeout_lock);
atomic_set(&set_timeout_tofree, 2);
&set_timeout_recv_msg,
&send_heartbeat_now);
if (rv) {
- up(&set_timeout_lock);
- } else {
- if ((do_heartbeat == IPMI_SET_TIMEOUT_FORCE_HB)
- || ((send_heartbeat_now)
- && (do_heartbeat == IPMI_SET_TIMEOUT_HB_IF_NECESSARY)))
- {
- rv = ipmi_heartbeat();
- }
+ mutex_unlock(&set_timeout_lock);
+ goto out;
}
+ wait_for_completion(&set_timeout_wait);
+
+ if ((do_heartbeat == IPMI_SET_TIMEOUT_FORCE_HB)
+ || ((send_heartbeat_now)
+ && (do_heartbeat == IPMI_SET_TIMEOUT_HB_IF_NECESSARY)))
+ {
+ rv = ipmi_heartbeat();
+ }
+ mutex_unlock(&set_timeout_lock);
+
+out:
return rv;
}
The semaphore is claimed when the set_timeout is sent and freed
when both messages are free. */
static atomic_t heartbeat_tofree = ATOMIC_INIT(0);
-static DECLARE_MUTEX(heartbeat_lock);
-static DECLARE_MUTEX_LOCKED(heartbeat_wait_lock);
+static DEFINE_MUTEX(heartbeat_lock);
+static DECLARE_COMPLETION(heartbeat_wait);
static void heartbeat_free_smi(struct ipmi_smi_msg *msg)
{
if (atomic_dec_and_test(&heartbeat_tofree))
- up(&heartbeat_wait_lock);
+ complete(&heartbeat_wait);
}
static void heartbeat_free_recv(struct ipmi_recv_msg *msg)
{
if (atomic_dec_and_test(&heartbeat_tofree))
- up(&heartbeat_wait_lock);
+ complete(&heartbeat_wait);
}
static struct ipmi_smi_msg heartbeat_smi_msg =
{
return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
}
- down(&heartbeat_lock);
+ mutex_lock(&heartbeat_lock);
atomic_set(&heartbeat_tofree, 2);
/* Don't reset the timer if we have the timer turned off, that
re-enables the watchdog. */
if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) {
- up(&heartbeat_lock);
+ mutex_unlock(&heartbeat_lock);
return 0;
}
&heartbeat_recv_msg,
1);
if (rv) {
- up(&heartbeat_lock);
+ mutex_unlock(&heartbeat_lock);
printk(KERN_WARNING PFX "heartbeat failure: %d\n",
rv);
return rv;
}
/* Wait for the heartbeat to be sent. */
- down(&heartbeat_wait_lock);
+ wait_for_completion(&heartbeat_wait);
if (heartbeat_recv_msg.msg.data[0] != 0) {
/* Got an error in the heartbeat response. It was already
rv = -EINVAL;
}
- up(&heartbeat_lock);
+ mutex_unlock(&heartbeat_lock);
return rv;
}
1);
}
-static struct watchdog_info ident=
+static struct watchdog_info ident =
{
.options = 0, /* WDIOF_SETTIMEOUT, */
.firmware_version = 1,
static int ipmi_close(struct inode *ino, struct file *filep)
{
- if (iminor(ino)==WATCHDOG_MINOR)
- {
+ if (iminor(ino) == WATCHDOG_MINOR) {
if (expect_close == 42) {
ipmi_watchdog_state = WDOG_TIMEOUT_NONE;
ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB);
} else {
- printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
+ printk(KERN_CRIT PFX
+ "Unexpected close, not stopping watchdog!\n");
ipmi_heartbeat();
}
clear_bit(0, &ipmi_wdog_open);
/* Disable the WDT if we are shutting down. */
ipmi_watchdog_state = WDOG_TIMEOUT_NONE;
panic_halt_ipmi_set_timeout();
- } else {
+ } else if (ipmi_watchdog_state != WDOG_TIMEOUT_NONE) {
/* Set a long timer to let the reboot happens, but
- reboot if it hangs. */
+ reboot if it hangs, but only if the watchdog
+ timer was already running. */
timeout = 120;
pretimeout = 0;
ipmi_watchdog_state = WDOG_TIMEOUT_RESET;
{
static int panic_event_handled = 0;
- /* On a panic, if we have a panic timeout, make sure that the thing
- reboots, even if it hangs during that panic. */
- if (watchdog_user && !panic_event_handled) {
- /* Make sure the panic doesn't hang, and make sure we
- do this only once. */
+ /* On a panic, if we have a panic timeout, make sure to extend
+ the watchdog timer to a reasonable value to complete the
+ panic, if the watchdog timer is running. Plus the
+ pretimeout is meaningless at panic time. */
+ if (watchdog_user && !panic_event_handled &&
+ ipmi_watchdog_state != WDOG_TIMEOUT_NONE) {
+ /* Make sure we do this only once. */
panic_event_handled = 1;
timeout = 255;
pretimeout = 0;
- ipmi_watchdog_state = WDOG_TIMEOUT_RESET;
panic_halt_ipmi_set_timeout();
}
};
-static void ipmi_new_smi(int if_num)
+static void ipmi_new_smi(int if_num, struct device *device)
{
ipmi_register_watchdog(if_num);
}
}
register_reboot_notifier(&wdog_reboot_notifier);
- notifier_chain_register(&panic_notifier_list, &wdog_panic_notifier);
+ atomic_notifier_chain_register(&panic_notifier_list,
+ &wdog_panic_notifier);
printk(KERN_INFO PFX "driver initialized\n");
release_nmi(&ipmi_nmi_handler);
#endif
- notifier_chain_unregister(&panic_notifier_list, &wdog_panic_notifier);
+ atomic_notifier_chain_unregister(&panic_notifier_list,
+ &wdog_panic_notifier);
unregister_reboot_notifier(&wdog_reboot_notifier);
if (! watchdog_user)
projects / cascardo / linux.git / blobdiff