linux-kernel - Re: [PATCH 16/26] dmaengine: Convert to new IDA API

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Date:   Sat, 23 Jun 2018 18:00:39 +0530
From:   Vinod <vkoul@...nel.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     linux-kernel@...r.kernel.org,
        Dan Williams <dan.j.williams@...el.com>,
        dmaengine@...r.kernel.org
Subject: Re: [PATCH 16/26] dmaengine: Convert to new IDA API

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@...nel.org>

> 
> Signed-off-by: Matthew Wilcox <willy@...radead.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

-- 
~Vinod