Commit adc064cd authored by Matthew Wilcox's avatar Matthew Wilcox Committed by Vinod Koul

dmaengine: Convert ID allocation to an IDA

dmaengine currently uses an IDR to allocate DMA IDs, but it only needs
to know whether IDs are in use or not; the ID to pointer functionality
of the IDR is unused.  That means it can use the more space-efficient IDA.
Signed-off-by: default avatarMatthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent 0c744ea4
......@@ -65,7 +65,7 @@
#include <linux/mempool.h>
static DEFINE_MUTEX(dma_list_mutex);
static DEFINE_IDR(dma_idr);
static DEFINE_IDA(dma_ida);
static LIST_HEAD(dma_device_list);
static long dmaengine_ref_count;
......@@ -162,7 +162,7 @@ static void chan_dev_release(struct device *dev)
chan_dev = container_of(dev, typeof(*chan_dev), device);
if (atomic_dec_and_test(chan_dev->idr_ref)) {
mutex_lock(&dma_list_mutex);
idr_remove(&dma_idr, chan_dev->dev_id);
ida_remove(&dma_ida, chan_dev->dev_id);
mutex_unlock(&dma_list_mutex);
kfree(chan_dev->idr_ref);
}
......@@ -898,14 +898,15 @@ static int get_dma_id(struct dma_device *device)
{
int rc;
mutex_lock(&dma_list_mutex);
rc = idr_alloc(&dma_idr, NULL, 0, 0, GFP_KERNEL);
if (rc >= 0)
device->dev_id = rc;
do {
if (!ida_pre_get(&dma_ida, GFP_KERNEL))
return -ENOMEM;
mutex_lock(&dma_list_mutex);
rc = ida_get_new(&dma_ida, &device->dev_id);
mutex_unlock(&dma_list_mutex);
} while (rc == -EAGAIN);
mutex_unlock(&dma_list_mutex);
return rc < 0 ? rc : 0;
return rc;
}
/**
......@@ -1035,7 +1036,7 @@ int dma_async_device_register(struct dma_device *device)
/* if we never registered a channel just release the idr */
if (atomic_read(idr_ref) == 0) {
mutex_lock(&dma_list_mutex);
idr_remove(&dma_idr, device->dev_id);
ida_remove(&dma_ida, device->dev_id);
mutex_unlock(&dma_list_mutex);
kfree(idr_ref);
return rc;
......
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