[PATCH] USB: convert a bunch of USB semaphores to mutexes

the patch below converts a bunch of semaphores-used-as-mutex in the USB
code to mutexes

Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 8 insertions, 7 deletions

diff --git a/drivers/usb/core/notify.c b/drivers/usb/core/notify.c
index fbbebab52fbd..4b55285de9a0 100644
--- a/drivers/usb/core/notify.c
+++ b/drivers/usb/core/notify.c
@@ -13,16 +13,17 @@
 #include <linux/kernel.h>
 #include <linux/notifier.h>
 #include <linux/usb.h>
+#include <linux/mutex.h>
 #include "usb.h"
 
 
 static struct notifier_block *usb_notifier_list;
-static DECLARE_MUTEX(usb_notifier_lock);
+static DEFINE_MUTEX(usb_notifier_lock);
 
 static void usb_notifier_chain_register(struct notifier_block **list,
                                         struct notifier_block *n)
 {
-        down(&usb_notifier_lock);
+        mutex_lock(&usb_notifier_lock);
         while (*list) {
                 if (n->priority > (*list)->priority)
                         break;
@@ -30,13 +31,13 @@ static void usb_notifier_chain_register(struct notifier_block **list,
         }
         n->next = *list;
         *list = n;
-        up(&usb_notifier_lock);
+        mutex_unlock(&usb_notifier_lock);
 }
 
 static void usb_notifier_chain_unregister(struct notifier_block **nl,
                                    struct notifier_block *n)
 {
-        down(&usb_notifier_lock);
+        mutex_lock(&usb_notifier_lock);
         while ((*nl)!=NULL) {
                 if ((*nl)==n) {
                         *nl = n->next;
@@ -45,7 +46,7 @@ static void usb_notifier_chain_unregister(struct notifier_block **nl,
                 nl=&((*nl)->next);
         }
 exit:
-        up(&usb_notifier_lock);
+        mutex_unlock(&usb_notifier_lock);
 }
 
 static int usb_notifier_call_chain(struct notifier_block **n,
@@ -54,7 +55,7 @@ static int usb_notifier_call_chain(struct notifier_block **n,
         int ret=NOTIFY_DONE;
         struct notifier_block *nb = *n;
 
-        down(&usb_notifier_lock);
+        mutex_lock(&usb_notifier_lock);
         while (nb) {
                 ret = nb->notifier_call(nb,val,v);
                 if (ret&NOTIFY_STOP_MASK) {
@@ -63,7 +64,7 @@ static int usb_notifier_call_chain(struct notifier_block **n,
                 nb = nb->next;
         }
 exit:
-        up(&usb_notifier_lock);
+        mutex_unlock(&usb_notifier_lock);
         return ret;
 }