[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, 10 insertions, 9 deletions

diff --git a/drivers/usb/mon/mon_main.c b/drivers/usb/mon/mon_main.c
index c34944c75047..b03e346e33f1 100644
--- a/drivers/usb/mon/mon_main.c
+++ b/drivers/usb/mon/mon_main.c
@@ -12,6 +12,7 @@
 #include <linux/debugfs.h>
 #include <linux/smp_lock.h>
 #include <linux/notifier.h>
+#include <linux/mutex.h>
 
 #include "usb_mon.h"
 #include "../core/hcd.h"
@@ -23,7 +24,7 @@ static void mon_dissolve(struct mon_bus *mbus, struct usb_bus *ubus);
 static void mon_bus_drop(struct kref *r);
 static void mon_bus_init(struct dentry *mondir, struct usb_bus *ubus);
 
-DECLARE_MUTEX(mon_lock);
+DEFINE_MUTEX(mon_lock);
 
 static struct dentry *mon_dir;          /* /dbg/usbmon */
 static LIST_HEAD(mon_buses);            /* All buses we know: struct mon_bus */
@@ -196,14 +197,14 @@ static void mon_bus_remove(struct usb_bus *ubus)
 {
         struct mon_bus *mbus = ubus->mon_bus;
 
-        down(&mon_lock);
+        mutex_lock(&mon_lock);
         list_del(&mbus->bus_link);
         debugfs_remove(mbus->dent_t);
         debugfs_remove(mbus->dent_s);
 
         mon_dissolve(mbus, ubus);
         kref_put(&mbus->ref, mon_bus_drop);
-        up(&mon_lock);
+        mutex_unlock(&mon_lock);
 }
 
 static int mon_notify(struct notifier_block *self, unsigned long action,
@@ -307,9 +308,9 @@ static void mon_bus_init(struct dentry *mondir, struct usb_bus *ubus)
                 goto err_create_s;
         mbus->dent_s = d;
 
-        down(&mon_lock);
+        mutex_lock(&mon_lock);
         list_add_tail(&mbus->bus_link, &mon_buses);
-        up(&mon_lock);
+        mutex_unlock(&mon_lock);
         return;
 
 err_create_s:
@@ -347,11 +348,11 @@ static int __init mon_init(void)
 
         usb_register_notify(&mon_nb);
 
-        down(&usb_bus_list_lock);
+        mutex_lock(&usb_bus_list_lock);
         list_for_each_entry (ubus, &usb_bus_list, bus_list) {
                 mon_bus_init(mondir, ubus);
         }
-        up(&usb_bus_list_lock);
+        mutex_unlock(&usb_bus_list_lock);
         return 0;
 }
 
@@ -363,7 +364,7 @@ static void __exit mon_exit(void)
         usb_unregister_notify(&mon_nb);
         usb_mon_deregister();
 
-        down(&mon_lock);
+        mutex_lock(&mon_lock);
         while (!list_empty(&mon_buses)) {
                 p = mon_buses.next;
                 mbus = list_entry(p, struct mon_bus, bus_link);
@@ -387,7 +388,7 @@ static void __exit mon_exit(void)
                 mon_dissolve(mbus, mbus->u_bus);
                 kref_put(&mbus->ref, mon_bus_drop);
         }
-        up(&mon_lock);
+        mutex_unlock(&mon_lock);
 
         debugfs_remove(mon_dir);
 }