[PATCH 16/26] dmaengine: Convert to new IDA API

[Matthew Wilcox]

Simpler and shorter code.

Signed-off-by: Matthew Wilcox <wi...@infradead.org>
---
 drivers/dma/dmaengine.c | 20 +++++---------------
 1 file changed, 5 insertions(+), 15 deletions(-)

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 08ba8473a284..1e9bdadfc312 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -161,9 +161,7 @@ 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);
-               ida_remove(&dma_ida, chan_dev->dev_id);
-               mutex_unlock(&dma_list_mutex);
+               ida_free(&dma_ida, chan_dev->dev_id);
                kfree(chan_dev->idr_ref);
        }
        kfree(chan_dev);
@@ -896,16 +894,10 @@ static bool device_has_all_tx_types(struct dma_device 
*device)
 
 static int get_dma_id(struct dma_device *device)
 {
-       int 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);
+       int rc = ida_alloc(&dma_ida, GFP_KERNEL);
 
+       if (rc >= 0)
+               device->dev_id = rc;
        return rc;
 }
 
@@ -1090,9 +1082,7 @@ int dma_async_device_register(struct dma_device *device)
 err_out:
        /* if we never registered a channel just release the idr */
        if (atomic_read(idr_ref) == 0) {
-               mutex_lock(&dma_list_mutex);
-               ida_remove(&dma_ida, device->dev_id);
-               mutex_unlock(&dma_list_mutex);
+               ida_free(&dma_ida, device->dev_id);
                kfree(idr_ref);
                return rc;
        }
-- 
2.17.1