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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>
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4f6e1945fe
commit
b2366d68d9
1 changed files with 7 additions and 7 deletions
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@ -37,7 +37,7 @@ struct dma_page { /* cacheable header for 'allocation' bytes */
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#define POOL_TIMEOUT_JIFFIES ((100 /* msec */ * HZ) / 1000)
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static DECLARE_MUTEX (pools_lock);
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static DEFINE_MUTEX (pools_lock);
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static ssize_t
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show_pools (struct device *dev, struct device_attribute *attr, char *buf)
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@ -55,7 +55,7 @@ show_pools (struct device *dev, struct device_attribute *attr, char *buf)
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size -= temp;
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next += temp;
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down (&pools_lock);
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mutex_lock(&pools_lock);
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list_for_each_entry(pool, &dev->dma_pools, pools) {
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unsigned pages = 0;
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unsigned blocks = 0;
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@ -73,7 +73,7 @@ show_pools (struct device *dev, struct device_attribute *attr, char *buf)
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size -= temp;
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next += temp;
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}
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up (&pools_lock);
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mutex_unlock(&pools_lock);
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return PAGE_SIZE - size;
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}
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@ -143,7 +143,7 @@ dma_pool_create (const char *name, struct device *dev,
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if (dev) {
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int ret;
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down (&pools_lock);
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mutex_lock(&pools_lock);
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if (list_empty (&dev->dma_pools))
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ret = device_create_file (dev, &dev_attr_pools);
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else
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@ -155,7 +155,7 @@ dma_pool_create (const char *name, struct device *dev,
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kfree(retval);
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retval = NULL;
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}
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up (&pools_lock);
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mutex_unlock(&pools_lock);
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} else
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INIT_LIST_HEAD (&retval->pools);
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@ -231,11 +231,11 @@ pool_free_page (struct dma_pool *pool, struct dma_page *page)
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void
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dma_pool_destroy (struct dma_pool *pool)
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{
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down (&pools_lock);
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mutex_lock(&pools_lock);
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list_del (&pool->pools);
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if (pool->dev && list_empty (&pool->dev->dma_pools))
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device_remove_file (pool->dev, &dev_attr_pools);
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up (&pools_lock);
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mutex_unlock(&pools_lock);
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while (!list_empty (&pool->page_list)) {
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struct dma_page *page;
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