On 21-06-18, 14:28, Matthew Wilcox wrote:
> Simpler and shorter code.
I couldn't find ida_alloc/ida_free in 4.18-rc1 so I assume this will go
thru tree adding this so:
Acked-by: Vinod Koul <vkoul@xxxxxxxxxx>
>
> Signed-off-by: Matthew Wilcox <willy@xxxxxxxxxxxxx>
> ---
> 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
--
~Vinod
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