9p: use struct mutex instead of struct semaphore

Replace semaphores protecting use flags with a mutex.

Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
Acked-by: Eric Van Hensbergen <ericvh@gmail.com>

1 files changed, 9 insertions, 9 deletions

diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index 0bab1f23590e..d23ed60483c3 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -49,7 +49,7 @@
 #define VIRTQUEUE_NUM   128
 
 /* a single mutex to manage channel initialization and attachment */
-static DECLARE_MUTEX(virtio_9p_lock);
+static DEFINE_MUTEX(virtio_9p_lock);
 /* global which tracks highest initialized channel */
 static int chan_index;
 
@@ -211,9 +211,9 @@ static void p9_virtio_close(struct p9_trans *trans)
         chan->max_tag = 0;
         spin_unlock_irqrestore(&chan->lock, flags);
 
-        down(&virtio_9p_lock);
+        mutex_lock(&virtio_9p_lock);
         chan->inuse = false;
-        up(&virtio_9p_lock);
+        mutex_unlock(&virtio_9p_lock);
 
         kfree(trans);
 }
@@ -381,10 +381,10 @@ static int p9_virtio_probe(struct virtio_device *vdev)
         struct virtio_chan *chan;
         int index;
 
-        down(&virtio_9p_lock);
+        mutex_lock(&virtio_9p_lock);
         index = chan_index++;
         chan = &channels[index];
-        up(&virtio_9p_lock);
+        mutex_unlock(&virtio_9p_lock);
 
         if (chan_index > MAX_9P_CHAN) {
                 printk(KERN_ERR "9p: virtio: Maximum channels exceeded\n");
@@ -413,9 +413,9 @@ static int p9_virtio_probe(struct virtio_device *vdev)
 out_free_vq:
         vdev->config->del_vq(chan->vq);
 fail:
-        down(&virtio_9p_lock);
+        mutex_lock(&virtio_9p_lock);
         chan_index--;
-        up(&virtio_9p_lock);
+        mutex_unlock(&virtio_9p_lock);
         return err;
 }
 
@@ -449,7 +449,7 @@ p9_virtio_create(const char *devname, char *args, int msize,
         struct virtio_chan *chan = channels;
         int index = 0;
 
-        down(&virtio_9p_lock);
+        mutex_lock(&virtio_9p_lock);
         while (index < MAX_9P_CHAN) {
                 if (chan->initialized && !chan->inuse) {
                         chan->inuse = true;
@@ -459,7 +459,7 @@ p9_virtio_create(const char *devname, char *args, int msize,
                         chan = &channels[index];
                 }
         }
-        up(&virtio_9p_lock);
+        mutex_unlock(&virtio_9p_lock);
 
         if (index >= MAX_9P_CHAN) {
                 printk(KERN_ERR "9p: no channels available\n");