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>

diff --git a/drivers/base/dmapool.c b/drivers/base/dmapool.c
index cd467c9..9406259 100644 (file)
--- 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;