Driver core: use mutex instead of semaphore in DMA pool handler

the DMA pool handler uses a semaphore as mutex. use the mutex API
instead of the (binary) semaphore

Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 7 insertions, 7 deletions

diff --git a/drivers/base/dmapool.c b/drivers/base/dmapool.c
index cd467c9f33b3..9406259754ad 100644
--- a/drivers/base/dmapool.c
+++ b/drivers/base/dmapool.c
@@ -37,7 +37,7 @@ struct dma_page {	/* cacheable header for 'allocation' bytes */
 
 #define POOL_TIMEOUT_JIFFIES    ((100 /* msec */ * HZ) / 1000)
 
-static DECLARE_MUTEX (pools_lock);
+static DEFINE_MUTEX (pools_lock);
 
 static ssize_t
 show_pools (struct device *dev, struct device_attribute *attr, char *buf)
@@ -55,7 +55,7 @@ show_pools (struct device *dev, struct device_attribute *attr, char *buf)
         size -= temp;
         next += temp;
 
-        down (&pools_lock);
+        mutex_lock(&pools_lock);
         list_for_each_entry(pool, &dev->dma_pools, pools) {
                 unsigned pages = 0;
                 unsigned blocks = 0;
@@ -73,7 +73,7 @@ show_pools (struct device *dev, struct device_attribute *attr, char *buf)
                 size -= temp;
                 next += temp;
         }
-        up (&pools_lock);
+        mutex_unlock(&pools_lock);
 
         return PAGE_SIZE - size;
 }
@@ -143,7 +143,7 @@ dma_pool_create (const char *name, struct device *dev,
         if (dev) {
                 int ret;
 
-                down (&pools_lock);
+                mutex_lock(&pools_lock);
                 if (list_empty (&dev->dma_pools))
                         ret = device_create_file (dev, &dev_attr_pools);
                 else
@@ -155,7 +155,7 @@ dma_pool_create (const char *name, struct device *dev,
                         kfree(retval);
                         retval = NULL;
                 }
-                up (&pools_lock);
+                mutex_unlock(&pools_lock);
         } else
                 INIT_LIST_HEAD (&retval->pools);
 
@@ -231,11 +231,11 @@ pool_free_page (struct dma_pool *pool, struct dma_page *page)
 void
 dma_pool_destroy (struct dma_pool *pool)
 {
-        down (&pools_lock);
+        mutex_lock(&pools_lock);
         list_del (&pool->pools);
         if (pool->dev && list_empty (&pool->dev->dma_pools))
                 device_remove_file (pool->dev, &dev_attr_pools);
-        up (&pools_lock);
+        mutex_unlock(&pools_lock);
 
         while (!list_empty (&pool->page_list)) {
                 struct dma_page         *page;