[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, 6 insertions, 5 deletions

diff --git a/drivers/usb/misc/ldusb.c b/drivers/usb/misc/ldusb.c
index f6bdaf08a80..966acb474f6 100644
--- a/drivers/usb/misc/ldusb.c
+++ b/drivers/usb/misc/ldusb.c
@@ -33,6 +33,7 @@
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/module.h>
+#include <linux/mutex.h>
 
 #include <asm/uaccess.h>
 #include <linux/input.h>
@@ -172,7 +173,7 @@ struct ld_usb {
 };
 
 /* prevent races between open() and disconnect() */
-static DECLARE_MUTEX(disconnect_sem);
+static DEFINE_MUTEX(disconnect_mutex);
 
 static struct usb_driver ld_usb_driver;
 
@@ -293,7 +294,7 @@ static int ld_usb_open(struct inode *inode, struct file *file)
         nonseekable_open(inode, file);
         subminor = iminor(inode);
 
-        down(&disconnect_sem);
+        mutex_lock(&disconnect_mutex);
 
         interface = usb_find_interface(&ld_usb_driver, subminor);
 
@@ -355,7 +356,7 @@ unlock_exit:
         up(&dev->sem);
 
 unlock_disconnect_exit:
-        up(&disconnect_sem);
+        mutex_unlock(&disconnect_mutex);
 
         return retval;
 }
@@ -740,7 +741,7 @@ static void ld_usb_disconnect(struct usb_interface *intf)
         struct ld_usb *dev;
         int minor;
 
-        down(&disconnect_sem);
+        mutex_lock(&disconnect_mutex);
 
         dev = usb_get_intfdata(intf);
         usb_set_intfdata(intf, NULL);
@@ -761,7 +762,7 @@ static void ld_usb_disconnect(struct usb_interface *intf)
                 up(&dev->sem);
         }
 
-        up(&disconnect_sem);
+        mutex_unlock(&disconnect_mutex);
 
         dev_info(&intf->dev, "LD USB Device #%d now disconnected\n",
                  (minor - USB_LD_MINOR_BASE));