USB: libusual: locking cleanup

I converted the usu_init_notify semaphore to normal mutex usage, and it
should still prevent the request_module before the init routine is
complete.  Before it acted more like a complete, now the mutex protects two
distinct section from running at the same time.

Signed-off-by: Daniel Walker <dwalker@mvista.com>
Cc: Pete Zaitcev <zaitcev@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 6 insertions, 8 deletions

diff --git a/drivers/usb/storage/libusual.c b/drivers/usb/storage/libusual.c
index 55b952084f0c..a28d49122e7a 100644
--- a/drivers/usb/storage/libusual.c
+++ b/drivers/usb/storage/libusual.c
@@ -9,6 +9,7 @@
 #include <linux/usb_usual.h>
 #include <linux/vmalloc.h>
 #include <linux/kthread.h>
+#include <linux/mutex.h>
 
 /*
  */
@@ -30,7 +31,7 @@ static atomic_t usu_bias = ATOMIC_INIT(USB_US_DEFAULT_BIAS);
 #define BIAS_NAME_SIZE  (sizeof("usb-storage"))
 static const char *bias_names[3] = { "none", "usb-storage", "ub" };
 
-static struct semaphore usu_init_notify;
+static DEFINE_MUTEX(usu_probe_mutex);
 static DECLARE_COMPLETION(usu_end_notify);
 static atomic_t total_threads = ATOMIC_INIT(0);
 
@@ -178,10 +179,7 @@ static int usu_probe_thread(void *arg)
         int rc;
         unsigned long flags;
 
-        /* A completion does not work here because it's counted. */
-        down(&usu_init_notify);
-        up(&usu_init_notify);
-
+        mutex_lock(&usu_probe_mutex);
         rc = request_module(bias_names[type]);
         spin_lock_irqsave(&usu_lock, flags);
         if (rc == 0 && (st->fls & USU_MOD_FL_PRESENT) == 0) {
@@ -194,6 +192,7 @@ static int usu_probe_thread(void *arg)
         }
         st->fls &= ~USU_MOD_FL_THREAD;
         spin_unlock_irqrestore(&usu_lock, flags);
+        mutex_unlock(&usu_probe_mutex);
 
         complete_and_exit(&usu_end_notify, 0);
 }
@@ -204,10 +203,9 @@ static int __init usb_usual_init(void)
 {
         int rc;
 
-        sema_init(&usu_init_notify, 0);
-
+        mutex_lock(&usu_probe_mutex);
         rc = usb_register(&usu_driver);
-        up(&usu_init_notify);
+        mutex_unlock(&usu_probe_mutex);
         return rc;
 }