linux-updates-20060309
[openafs.git] / src / rx / LINUX / rx_kmutex.c
index a420d5e..dbd3b32 100644 (file)
@@ -23,12 +23,12 @@ RCSID
 #include "rx_kmutex.h"
 #include "rx/rx_kernel.h"
 
-#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
-
 void
 afs_mutex_init(afs_kmutex_t * l)
 {
-#if defined(AFS_LINUX24_ENV)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
+    mutex_init(&l->mutex);
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
     init_MUTEX(&l->sem);
 #else
     l->sem = MUTEX;
@@ -39,7 +39,11 @@ afs_mutex_init(afs_kmutex_t * l)
 void
 afs_mutex_enter(afs_kmutex_t * l)
 {
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
+    mutex_lock(&l->mutex);
+#else
     down(&l->sem);
+#endif
     if (l->owner)
        osi_Panic("mutex_enter: 0x%x held by %d", l, l->owner);
     l->owner = current->pid;
@@ -48,7 +52,11 @@ afs_mutex_enter(afs_kmutex_t * l)
 int
 afs_mutex_tryenter(afs_kmutex_t * l)
 {
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
+    if (mutex_trylock(&l->mutex) == 0)
+#else
     if (down_trylock(&l->sem))
+#endif
        return 0;
     l->owner = current->pid;
     return 1;
@@ -60,7 +68,11 @@ afs_mutex_exit(afs_kmutex_t * l)
     if (l->owner != current->pid)
        osi_Panic("mutex_exit: 0x%x held by %d", l, l->owner);
     l->owner = 0;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
+    mutex_unlock(&l->mutex);
+#else
     up(&l->sem);
+#endif
 }
 
 /* CV_WAIT and CV_TIMEDWAIT sleep until the specified event occurs, or, in the
@@ -74,7 +86,7 @@ afs_mutex_exit(afs_kmutex_t * l)
 int
 afs_cv_wait(afs_kcondvar_t * cv, afs_kmutex_t * l, int sigok)
 {
-    int isAFSGlocked = ISAFS_GLOCK();
+    int seq, isAFSGlocked = ISAFS_GLOCK();
     sigset_t saved_set;
 #ifdef DECLARE_WAITQUEUE
     DECLARE_WAITQUEUE(wait, current);
@@ -82,8 +94,10 @@ afs_cv_wait(afs_kcondvar_t * cv, afs_kmutex_t * l, int sigok)
     struct wait_queue wait = { current, NULL };
 #endif
 
-    add_wait_queue(cv, &wait);
+    seq = cv->seq;
+    
     set_current_state(TASK_INTERRUPTIBLE);
+    add_wait_queue(&cv->waitq, &wait);
 
     if (isAFSGlocked)
        AFS_GUNLOCK();
@@ -97,8 +111,29 @@ afs_cv_wait(afs_kcondvar_t * cv, afs_kmutex_t * l, int sigok)
        SIG_UNLOCK(current);
     }
 
-    schedule();
-    remove_wait_queue(cv, &wait);
+    while(seq == cv->seq) {
+       schedule();
+#ifdef AFS_LINUX26_ENV
+#ifdef CONFIG_PM
+       if (
+#ifdef PF_FREEZE
+           current->flags & PF_FREEZE
+#else
+           !current->todo
+#endif
+           )
+#ifdef LINUX_REFRIGERATOR_TAKES_PF_FREEZE
+           refrigerator(PF_FREEZE);
+#else
+           refrigerator();
+#endif
+           set_current_state(TASK_INTERRUPTIBLE);
+#endif
+#endif
+    }
+
+    remove_wait_queue(&cv->waitq, &wait);
+    set_current_state(TASK_RUNNING);
 
     if (!sigok) {
        SIG_LOCK(current);
@@ -117,27 +152,32 @@ afs_cv_wait(afs_kcondvar_t * cv, afs_kmutex_t * l, int sigok)
 void
 afs_cv_timedwait(afs_kcondvar_t * cv, afs_kmutex_t * l, int waittime)
 {
-    int isAFSGlocked = ISAFS_GLOCK();
+    int seq, isAFSGlocked = ISAFS_GLOCK();
     long t = waittime * HZ / 1000;
 #ifdef DECLARE_WAITQUEUE
     DECLARE_WAITQUEUE(wait, current);
 #else
     struct wait_queue wait = { current, NULL };
 #endif
+    seq = cv->seq;
 
-    add_wait_queue(cv, &wait);
     set_current_state(TASK_INTERRUPTIBLE);
+    add_wait_queue(&cv->waitq, &wait);
 
     if (isAFSGlocked)
        AFS_GUNLOCK();
     MUTEX_EXIT(l);
 
-    t = schedule_timeout(t);
-    remove_wait_queue(cv, &wait);
+    while(seq == cv->seq) {
+       t = schedule_timeout(t);
+       if (!t)         /* timeout */
+           break;
+    }
+    
+    remove_wait_queue(&cv->waitq, &wait);
+    set_current_state(TASK_RUNNING);
 
     if (isAFSGlocked)
        AFS_GLOCK();
     MUTEX_ENTER(l);
 }
-
-#endif