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

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

[Matthew Wilcox]

On Sat, Jun 23, 2018 at 06:00:39PM +0530, Vinod wrote:
> 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@kernel.org>

Yup, you were bcc'd on patch 3/26 which added the new API.  I'll be sending a pull request for this mass conversion, and I'll add your ack.  Thanks!
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[16/26] dmaengine: Convert to new IDA API

[Matthew Wilcox]

On Sun, Jun 24, 2018 at 09:57:45AM +0200, Lars-Peter Clausen wrote:
> > +	int rc = ida_alloc(&dma_ida, GFP_KERNEL);
> >  
> > +	if (rc >= 0)
> > +		device->dev_id = rc;
> >  	return rc;
> 
> This used to return 0 on success, now it returns the ID. That wont work
> considering that it is used like this
> 
>     rc = get_dma_id(device);
>     if (rc != 0) ...

Thanks!  I changed it to this:

static int get_dma_id(struct dma_device *device)
{
        int rc = ida_alloc(&dma_ida, GFP_KERNEL);

        if (rc < 0)
                return rc;
        device->dev_id = rc;
        return 0;
}
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[16/26] dmaengine: Convert to new IDA API

[Lars-Peter Clausen]

On 06/21/2018 11:28 PM, Matthew Wilcox wrote:
> Simpler and shorter code.
> 
> Signed-off-by: Matthew Wilcox <willy@infradead.org>
> ---
[...]>  {
> -	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;

This used to return 0 on success, now it returns the ID. That wont work
considering that it is used like this

    rc = get_dma_id(device);
    if (rc != 0) ...


>  }
>  
> @@ -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;
>  	}
>
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[16/26] dmaengine: Convert to new IDA API

[Vinod Koul]

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@kernel.org>

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

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

[Matthew Wilcox]

Simpler and shorter code.

Signed-off-by: Matthew Wilcox <willy@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;
 	}