3 files changed, 46 insertions, 32 deletions

diff --git a/drivers/char/snsc.h b/drivers/char/snsc.h
index a9efc13cc858..8a98169b60c1 100644
--- a/drivers/char/snsc.h
+++ b/drivers/char/snsc.h
@@ -5,7 +5,7 @@
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
- * Copyright (C) 2004 Silicon Graphics, Inc. All rights reserved.
+ * Copyright (C) 2004-2006 Silicon Graphics, Inc. All rights reserved.
  */
 
 /*
@@ -70,6 +70,9 @@ struct sysctl_data_s {
 #define EV_CLASS_TEST_WARNING   0x6000ul
 #define EV_CLASS_PWRD_NOTIFY    0x8000ul
 
+/* ENV class codes */
+#define ENV_PWRDN_PEND          0x4101ul
+
 #define EV_SEVERITY_POWER_STABLE        0x0000ul
 #define EV_SEVERITY_POWER_LOW_WARNING   0x0100ul
 #define EV_SEVERITY_POWER_HIGH_WARNING  0x0200ul
diff --git a/drivers/char/snsc_event.c b/drivers/char/snsc_event.c
index baaa365285fa..a4fa507eed9e 100644
--- a/drivers/char/snsc_event.c
+++ b/drivers/char/snsc_event.c
@@ -5,7 +5,7 @@
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
- * Copyright (C) 2004 Silicon Graphics, Inc. All rights reserved.
+ * Copyright (C) 2004-2006 Silicon Graphics, Inc. All rights reserved.
  */
 
 /*
@@ -187,7 +187,8 @@ scdrv_event_severity(int code)
 static void
 scdrv_dispatch_event(char *event, int len)
 {
-        int code, esp_code, src;
+        static int snsc_shutting_down = 0;
+        int code, esp_code, src, class;
         char desc[CHUNKSIZE];
         char *severity;
 
@@ -199,9 +200,25 @@ scdrv_dispatch_event(char *event, int len)
         /* how urgent is the message? */
         severity = scdrv_event_severity(code);
 
-        if ((code & EV_CLASS_MASK) == EV_CLASS_PWRD_NOTIFY) {
+        class = (code & EV_CLASS_MASK);
+
+        if (class == EV_CLASS_PWRD_NOTIFY || code == ENV_PWRDN_PEND) {
                 struct task_struct *p;
 
+                if (snsc_shutting_down)
+                        return;
+
+                snsc_shutting_down = 1;
+
+                /* give a message for each type of event */
+                if (class == EV_CLASS_PWRD_NOTIFY)
+                        printk(KERN_NOTICE "Power off indication received."
+                               " Sending SIGPWR to init...\n");
+                else if (code == ENV_PWRDN_PEND)
+                        printk(KERN_CRIT "WARNING: Shutting down the system"
+                               " due to a critical environmental condition."
+                               " Sending SIGPWR to init...\n");
+
                 /* give a SIGPWR signal to init proc */
 
                 /* first find init's task */
@@ -210,12 +227,11 @@ scdrv_dispatch_event(char *event, int len)
                         if (p->pid == 1)
                                 break;
                 }
-                if (p) { /* we found init's task */
-                        printk(KERN_EMERG "Power off indication received. Initiating power fail sequence...\n");
+                if (p) {
                         force_sig(SIGPWR, p);
-                } else { /* failed to find init's task - just give message(s) */
-                        printk(KERN_WARNING "Failed to find init proc to handle power off!\n");
-                        printk("%s|$(0x%x)%s\n", severity, esp_code, desc);
+                } else {
+                        printk(KERN_ERR "Failed to signal init!\n");
+                        snsc_shutting_down = 0; /* so can try again (?) */
                 }
                 read_unlock(&tasklist_lock);
         } else {
diff --git a/drivers/sn/ioc4.c b/drivers/sn/ioc4.c
index ea75b3d0612b..67140a5804f5 100644
--- a/drivers/sn/ioc4.c
+++ b/drivers/sn/ioc4.c
@@ -31,7 +31,7 @@
 #include <linux/ioc4.h>
 #include <linux/mmtimer.h>
 #include <linux/rtc.h>
-#include <linux/rwsem.h>
+#include <linux/mutex.h>
 #include <asm/sn/addrs.h>
 #include <asm/sn/clksupport.h>
 #include <asm/sn/shub_mmr.h>
@@ -54,11 +54,10 @@
  * Submodule management *
  ************************/
 
-static LIST_HEAD(ioc4_devices);
-static DECLARE_RWSEM(ioc4_devices_rwsem);
+static DEFINE_MUTEX(ioc4_mutex);
 
+static LIST_HEAD(ioc4_devices);
 static LIST_HEAD(ioc4_submodules);
-static DECLARE_RWSEM(ioc4_submodules_rwsem);
 
 /* Register an IOC4 submodule */
 int
@@ -66,15 +65,13 @@ ioc4_register_submodule(struct ioc4_submodule *is)
 {
         struct ioc4_driver_data *idd;
 
-        down_write(&ioc4_submodules_rwsem);
+        mutex_lock(&ioc4_mutex);
         list_add(&is->is_list, &ioc4_submodules);
-        up_write(&ioc4_submodules_rwsem);
 
         /* Initialize submodule for each IOC4 */
         if (!is->is_probe)
-                return 0;
+                goto out;
 
-        down_read(&ioc4_devices_rwsem);
         list_for_each_entry(idd, &ioc4_devices, idd_list) {
                 if (is->is_probe(idd)) {
                         printk(KERN_WARNING
@@ -84,8 +81,8 @@ ioc4_register_submodule(struct ioc4_submodule *is)
                                pci_name(idd->idd_pdev));
                 }
         }
-        up_read(&ioc4_devices_rwsem);
-
+ out:
+        mutex_unlock(&ioc4_mutex);
         return 0;
 }
 
@@ -95,15 +92,13 @@ ioc4_unregister_submodule(struct ioc4_submodule *is)
 {
         struct ioc4_driver_data *idd;
 
-        down_write(&ioc4_submodules_rwsem);
+        mutex_lock(&ioc4_mutex);
         list_del(&is->is_list);
-        up_write(&ioc4_submodules_rwsem);
 
         /* Remove submodule for each IOC4 */
         if (!is->is_remove)
-                return;
+                goto out;
 
-        down_read(&ioc4_devices_rwsem);
         list_for_each_entry(idd, &ioc4_devices, idd_list) {
                 if (is->is_remove(idd)) {
                         printk(KERN_WARNING
@@ -113,7 +108,8 @@ ioc4_unregister_submodule(struct ioc4_submodule *is)
                                pci_name(idd->idd_pdev));
                 }
         }
-        up_read(&ioc4_devices_rwsem);
+ out:
+        mutex_unlock(&ioc4_mutex);
 }
 
 /*********************
@@ -312,12 +308,11 @@ ioc4_probe(struct pci_dev *pdev, const struct pci_device_id *pci_id)
         /* Track PCI-device specific data */
         idd->idd_serial_data = NULL;
         pci_set_drvdata(idd->idd_pdev, idd);
-        down_write(&ioc4_devices_rwsem);
+
+        mutex_lock(&ioc4_mutex);
         list_add(&idd->idd_list, &ioc4_devices);
-        up_write(&ioc4_devices_rwsem);
 
         /* Add this IOC4 to all submodules */
-        down_read(&ioc4_submodules_rwsem);
         list_for_each_entry(is, &ioc4_submodules, is_list) {
                 if (is->is_probe && is->is_probe(idd)) {
                         printk(KERN_WARNING
@@ -327,7 +322,7 @@ ioc4_probe(struct pci_dev *pdev, const struct pci_device_id *pci_id)
                                pci_name(idd->idd_pdev));
                 }
         }
-        up_read(&ioc4_submodules_rwsem);
+        mutex_unlock(&ioc4_mutex);
 
         return 0;
 
@@ -351,7 +346,7 @@ ioc4_remove(struct pci_dev *pdev)
         idd = pci_get_drvdata(pdev);
 
         /* Remove this IOC4 from all submodules */
-        down_read(&ioc4_submodules_rwsem);
+        mutex_lock(&ioc4_mutex);
         list_for_each_entry(is, &ioc4_submodules, is_list) {
                 if (is->is_remove && is->is_remove(idd)) {
                         printk(KERN_WARNING
@@ -361,7 +356,7 @@ ioc4_remove(struct pci_dev *pdev)
                                pci_name(idd->idd_pdev));
                 }
         }
-        up_read(&ioc4_submodules_rwsem);
+        mutex_unlock(&ioc4_mutex);
 
         /* Release resources */
         iounmap(idd->idd_misc_regs);
@@ -377,9 +372,9 @@ ioc4_remove(struct pci_dev *pdev)
         pci_disable_device(pdev);
 
         /* Remove and free driver data */
-        down_write(&ioc4_devices_rwsem);
+        mutex_lock(&ioc4_mutex);
         list_del(&idd->idd_list);
-        up_write(&ioc4_devices_rwsem);
+        mutex_unlock(&ioc4_mutex);
         kfree(idd);
 }