[PATCH] kernel/module.c Semaphore to Mutex Conversion for module_mutex

This patch converts the module_mutex semaphore to a mutex.

Signed-off-by: Ashutosh Naik <ashutosh.naik@gmail.com>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/kernel/module.c b/kernel/module.c
index de6312d..fb40429 100644 (file)
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -61,7 +61,7 @@
 static DEFINE_SPINLOCK(modlist_lock);
 
 /* List of modules, protected by module_mutex AND modlist_lock */
-static DECLARE_MUTEX(module_mutex);
+static DEFINE_MUTEX(module_mutex);
 static LIST_HEAD(modules);
 
 static DEFINE_MUTEX(notify_mutex);
@@ -602,7 +602,7 @@ static void free_module(struct module *mod);
 static void wait_for_zero_refcount(struct module *mod)
 {
        /* Since we might sleep for some time, drop the semaphore first */
-       up(&module_mutex);
+       mutex_unlock(&module_mutex);
        for (;;) {
                DEBUGP("Looking at refcount...\n");
                set_current_state(TASK_UNINTERRUPTIBLE);
@@ -611,7 +611,7 @@ static void wait_for_zero_refcount(struct module *mod)
                schedule();
        }
        current->state = TASK_RUNNING;
-       down(&module_mutex);
+       mutex_lock(&module_mutex);
 }
 
 asmlinkage long
@@ -628,7 +628,7 @@ sys_delete_module(const char __user *name_user, unsigned int flags)
                return -EFAULT;
        name[MODULE_NAME_LEN-1] = '\0';
 
-       if (down_interruptible(&module_mutex) != 0)
+       if (mutex_lock_interruptible(&module_mutex) != 0)
                return -EINTR;
 
        mod = find_module(name);
@@ -677,14 +677,14 @@ sys_delete_module(const char __user *name_user, unsigned int flags)
 
        /* Final destruction now noone is using it. */
        if (mod->exit != NULL) {
-               up(&module_mutex);
+               mutex_unlock(&module_mutex);
                mod->exit();
-               down(&module_mutex);
+               mutex_lock(&module_mutex);
        }
        free_module(mod);
 
  out:
-       up(&module_mutex);
+       mutex_unlock(&module_mutex);
        return ret;
 }
 
@@ -1973,13 +1973,13 @@ sys_init_module(void __user *umod,
                return -EPERM;
 
        /* Only one module load at a time, please */
-       if (down_interruptible(&module_mutex) != 0)
+       if (mutex_lock_interruptible(&module_mutex) != 0)
                return -EINTR;
 
        /* Do all the hard work */
        mod = load_module(umod, len, uargs);
        if (IS_ERR(mod)) {
-               up(&module_mutex);
+               mutex_unlock(&module_mutex);
                return PTR_ERR(mod);
        }
 
@@ -1988,7 +1988,7 @@ sys_init_module(void __user *umod,
        stop_machine_run(__link_module, mod, NR_CPUS);
 
        /* Drop lock so they can recurse */
-       up(&module_mutex);
+       mutex_unlock(&module_mutex);
 
        mutex_lock(&notify_mutex);
        notifier_call_chain(&module_notify_list, MODULE_STATE_COMING, mod);
@@ -2007,15 +2007,15 @@ sys_init_module(void __user *umod,
                               mod->name);
                else {
                        module_put(mod);
-                       down(&module_mutex);
+                       mutex_lock(&module_mutex);
                        free_module(mod);
-                       up(&module_mutex);
+                       mutex_unlock(&module_mutex);
                }
                return ret;
        }
 
        /* Now it's a first class citizen! */
-       down(&module_mutex);
+       mutex_lock(&module_mutex);
        mod->state = MODULE_STATE_LIVE;
        /* Drop initial reference. */
        module_put(mod);
@@ -2023,7 +2023,7 @@ sys_init_module(void __user *umod,
        mod->module_init = NULL;
        mod->init_size = 0;
        mod->init_text_size = 0;
-       up(&module_mutex);
+       mutex_unlock(&module_mutex);
 
        return 0;
 }
@@ -2113,7 +2113,7 @@ struct module *module_get_kallsym(unsigned int symnum,
 {
        struct module *mod;
 
-       down(&module_mutex);
+       mutex_lock(&module_mutex);
        list_for_each_entry(mod, &modules, list) {
                if (symnum < mod->num_symtab) {
                        *value = mod->symtab[symnum].st_value;
@@ -2121,12 +2121,12 @@ struct module *module_get_kallsym(unsigned int symnum,
                        strncpy(namebuf,
                                mod->strtab + mod->symtab[symnum].st_name,
                                127);
-                       up(&module_mutex);
+                       mutex_unlock(&module_mutex);
                        return mod;
                }
                symnum -= mod->num_symtab;
        }
-       up(&module_mutex);
+       mutex_unlock(&module_mutex);
        return NULL;
 }
 
@@ -2169,7 +2169,7 @@ static void *m_start(struct seq_file *m, loff_t *pos)
        struct list_head *i;
        loff_t n = 0;
 
-       down(&module_mutex);
+       mutex_lock(&module_mutex);
        list_for_each(i, &modules) {
                if (n++ == *pos)
                        break;
@@ -2190,7 +2190,7 @@ static void *m_next(struct seq_file *m, void *p, loff_t *pos)
 
 static void m_stop(struct seq_file *m, void *p)
 {
-       up(&module_mutex);
+       mutex_unlock(&module_mutex);
 }
 
 static int m_show(struct seq_file *m, void *p)