1 files changed, 78 insertions, 43 deletions

diff --git a/drivers/char/ipmi/ipmi_watchdog.c b/drivers/char/ipmi/ipmi_watchdog.c
index 73f759eaa5a6..90fb2a541916 100644
--- a/drivers/char/ipmi/ipmi_watchdog.c
+++ b/drivers/char/ipmi/ipmi_watchdog.c
@@ -135,6 +135,7 @@
 static int nowayout = WATCHDOG_NOWAYOUT;
 
 static ipmi_user_t watchdog_user = NULL;
+static int watchdog_ifnum;
 
 /* Default the timeout to 10 seconds. */
 static int timeout = 10;
@@ -161,6 +162,8 @@ static struct fasync_struct *fasync_q = NULL;
 static char pretimeout_since_last_heartbeat = 0;
 static char expect_close;
 
+static int ifnum_to_use = -1;
+
 static DECLARE_RWSEM(register_sem);
 
 /* Parameters to ipmi_set_timeout */
@@ -169,6 +172,8 @@ static DECLARE_RWSEM(register_sem);
 #define IPMI_SET_TIMEOUT_FORCE_HB               2
 
 static int ipmi_set_timeout(int do_heartbeat);
+static void ipmi_register_watchdog(int ipmi_intf);
+static void ipmi_unregister_watchdog(int ipmi_intf);
 
 /* If true, the driver will start running as soon as it is configured
    and ready. */
@@ -245,6 +250,26 @@ static int get_param_str(char *buffer, struct kernel_param *kp)
         return strlen(buffer);
 }
 
+
+static int set_param_wdog_ifnum(const char *val, struct kernel_param *kp)
+{
+        int rv = param_set_int(val, kp);
+        if (rv)
+                return rv;
+        if ((ifnum_to_use < 0) || (ifnum_to_use == watchdog_ifnum))
+                return 0;
+
+        ipmi_unregister_watchdog(watchdog_ifnum);
+        ipmi_register_watchdog(ifnum_to_use);
+        return 0;
+}
+
+module_param_call(ifnum_to_use, set_param_wdog_ifnum, get_param_int,
+                  &ifnum_to_use, 0644);
+MODULE_PARM_DESC(ifnum_to_use, "The interface number to use for the watchdog "
+                 "timer.  Setting to -1 defaults to the first registered "
+                 "interface");
+
 module_param_call(timeout, set_param_int, get_param_int, &timeout, 0644);
 MODULE_PARM_DESC(timeout, "Timeout value in seconds.");
 
@@ -263,12 +288,13 @@ module_param_call(preop, set_param_str, get_param_str, preop_op, 0644);
 MODULE_PARM_DESC(preop, "Pretimeout driver operation.  One of: "
                  "preop_none, preop_panic, preop_give_data.");
 
-module_param(start_now, int, 0);
+module_param(start_now, int, 0444);
 MODULE_PARM_DESC(start_now, "Set to 1 to start the watchdog as"
                  "soon as the driver is loaded.");
 
 module_param(nowayout, int, 0644);
-MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
+                 "(default=CONFIG_WATCHDOG_NOWAYOUT)");
 
 /* Default state of the timer. */
 static unsigned char ipmi_watchdog_state = WDOG_TIMEOUT_NONE;
@@ -872,6 +898,11 @@ static void ipmi_register_watchdog(int ipmi_intf)
         if (watchdog_user)
                 goto out;
 
+        if ((ifnum_to_use >= 0) && (ifnum_to_use != ipmi_intf))
+                goto out;
+
+        watchdog_ifnum = ipmi_intf;
+
         rv = ipmi_create_user(ipmi_intf, &ipmi_hndlrs, NULL, &watchdog_user);
         if (rv < 0) {
                 printk(KERN_CRIT PFX "Unable to register with ipmi\n");
@@ -901,6 +932,39 @@ static void ipmi_register_watchdog(int ipmi_intf)
         }
 }
 
+static void ipmi_unregister_watchdog(int ipmi_intf)
+{
+        int rv;
+
+        down_write(&register_sem);
+
+        if (!watchdog_user)
+                goto out;
+
+        if (watchdog_ifnum != ipmi_intf)
+                goto out;
+
+        /* Make sure no one can call us any more. */
+        misc_deregister(&ipmi_wdog_miscdev);
+
+        /* Wait to make sure the message makes it out.  The lower layer has
+           pointers to our buffers, we want to make sure they are done before
+           we release our memory. */
+        while (atomic_read(&set_timeout_tofree))
+                schedule_timeout_uninterruptible(1);
+
+        /* Disconnect from IPMI. */
+        rv = ipmi_destroy_user(watchdog_user);
+        if (rv) {
+                printk(KERN_WARNING PFX "error unlinking from IPMI: %d\n",
+                       rv);
+        }
+        watchdog_user = NULL;
+
+ out:
+        up_write(&register_sem);
+}
+
 #ifdef HAVE_NMI_HANDLER
 static int
 ipmi_nmi(void *dev_id, int cpu, int handled)
@@ -1004,9 +1068,7 @@ static void ipmi_new_smi(int if_num, struct device *device)
 
 static void ipmi_smi_gone(int if_num)
 {
-        /* This can never be called, because once the watchdog is
-           registered, the interface can't go away until the watchdog
-           is unregistered. */
+        ipmi_unregister_watchdog(if_num);
 }
 
 static struct ipmi_smi_watcher smi_watcher =
@@ -1148,30 +1210,32 @@ static int __init ipmi_wdog_init(void)
 
         check_parms();
 
+        register_reboot_notifier(&wdog_reboot_notifier);
+        atomic_notifier_chain_register(&panic_notifier_list,
+                        &wdog_panic_notifier);
+
         rv = ipmi_smi_watcher_register(&smi_watcher);
         if (rv) {
 #ifdef HAVE_NMI_HANDLER
                 if (preaction_val == WDOG_PRETIMEOUT_NMI)
                         release_nmi(&ipmi_nmi_handler);
 #endif
+                atomic_notifier_chain_unregister(&panic_notifier_list,
+                                                 &wdog_panic_notifier);
+                unregister_reboot_notifier(&wdog_reboot_notifier);
                 printk(KERN_WARNING PFX "can't register smi watcher\n");
                 return rv;
         }
 
-        register_reboot_notifier(&wdog_reboot_notifier);
-        atomic_notifier_chain_register(&panic_notifier_list,
-                        &wdog_panic_notifier);
-
         printk(KERN_INFO PFX "driver initialized\n");
 
         return 0;
 }
 
-static __exit void ipmi_unregister_watchdog(void)
+static void __exit ipmi_wdog_exit(void)
 {
-        int rv;
-
-        down_write(&register_sem);
+        ipmi_smi_watcher_unregister(&smi_watcher);
+        ipmi_unregister_watchdog(watchdog_ifnum);
 
 #ifdef HAVE_NMI_HANDLER
         if (nmi_handler_registered)
@@ -1179,37 +1243,8 @@ static __exit void ipmi_unregister_watchdog(void)
 #endif
 
         atomic_notifier_chain_unregister(&panic_notifier_list,
-                        &wdog_panic_notifier);
+                                         &wdog_panic_notifier);
         unregister_reboot_notifier(&wdog_reboot_notifier);
-
-        if (! watchdog_user)
-                goto out;
-
-        /* Make sure no one can call us any more. */
-        misc_deregister(&ipmi_wdog_miscdev);
-
-        /* Wait to make sure the message makes it out.  The lower layer has
-           pointers to our buffers, we want to make sure they are done before
-           we release our memory. */
-        while (atomic_read(&set_timeout_tofree))
-                schedule_timeout_uninterruptible(1);
-
-        /* Disconnect from IPMI. */
-        rv = ipmi_destroy_user(watchdog_user);
-        if (rv) {
-                printk(KERN_WARNING PFX "error unlinking from IPMI: %d\n",
-                       rv);
-        }
-        watchdog_user = NULL;
-
- out:
-        up_write(&register_sem);
-}
-
-static void __exit ipmi_wdog_exit(void)
-{
-        ipmi_smi_watcher_unregister(&smi_watcher);
-        ipmi_unregister_watchdog();
 }
 module_exit(ipmi_wdog_exit);
 module_init(ipmi_wdog_init);