linux-kernel - Re: [PATCH v5 04/11] powerpc/pseries/iommu: Add ddw_list_new

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Date:   Mon, 19 Jul 2021 16:14:44 +0200
From:   Frederic Barrat <fbarrat@...ux.ibm.com>
To:     Leonardo Bras <leobras.c@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        David Gibson <david@...son.dropbear.id.au>,
        kernel test robot <lkp@...el.com>,
        Nicolin Chen <nicoleotsuka@...il.com>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 04/11] powerpc/pseries/iommu: Add ddw_list_new_entry()
 helper



On 16/07/2021 10:27, Leonardo Bras wrote:
> There are two functions creating direct_window_list entries in a
> similar way, so create a ddw_list_new_entry() to avoid duplicity and
> simplify those functions.
> 
> Signed-off-by: Leonardo Bras <leobras.c@...il.com>
> Reviewed-by: Alexey Kardashevskiy <aik@...abs.ru>
> ---

LGTM
Reviewed-by: Frederic Barrat <fbarrat@...ux.ibm.com>


>   arch/powerpc/platforms/pseries/iommu.c | 32 +++++++++++++++++---------
>   1 file changed, 21 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
> index 33d82865d6e6..712d1667144a 100644
> --- a/arch/powerpc/platforms/pseries/iommu.c
> +++ b/arch/powerpc/platforms/pseries/iommu.c
> @@ -874,6 +874,21 @@ static u64 find_existing_ddw(struct device_node *pdn, int *window_shift)
>   	return dma_addr;
>   }
>   
> +static struct direct_window *ddw_list_new_entry(struct device_node *pdn,
> +						const struct dynamic_dma_window_prop *dma64)
> +{
> +	struct direct_window *window;
> +
> +	window = kzalloc(sizeof(*window), GFP_KERNEL);
> +	if (!window)
> +		return NULL;
> +
> +	window->device = pdn;
> +	window->prop = dma64;
> +
> +	return window;
> +}
> +
>   static int find_existing_ddw_windows(void)
>   {
>   	int len;
> @@ -886,18 +901,15 @@ static int find_existing_ddw_windows(void)
>   
>   	for_each_node_with_property(pdn, DIRECT64_PROPNAME) {
>   		direct64 = of_get_property(pdn, DIRECT64_PROPNAME, &len);
> -		if (!direct64)
> -			continue;
> -
> -		window = kzalloc(sizeof(*window), GFP_KERNEL);
> -		if (!window || len < sizeof(struct dynamic_dma_window_prop)) {
> -			kfree(window);
> +		if (!direct64 || len < sizeof(*direct64)) {
>   			remove_ddw(pdn, true);
>   			continue;
>   		}
>   
> -		window->device = pdn;
> -		window->prop = direct64;
> +		window = ddw_list_new_entry(pdn, direct64);
> +		if (!window)
> +			break;
> +
>   		spin_lock(&direct_window_list_lock);
>   		list_add(&window->list, &direct_window_list);
>   		spin_unlock(&direct_window_list_lock);
> @@ -1307,7 +1319,7 @@ static u64 enable_ddw(struct pci_dev *dev, struct device_node *pdn)
>   	dev_dbg(&dev->dev, "created tce table LIOBN 0x%x for %pOF\n",
>   		  create.liobn, dn);
>   
> -	window = kzalloc(sizeof(*window), GFP_KERNEL);
> +	window = ddw_list_new_entry(pdn, ddwprop);
>   	if (!window)
>   		goto out_clear_window;
>   
> @@ -1326,8 +1338,6 @@ static u64 enable_ddw(struct pci_dev *dev, struct device_node *pdn)
>   		goto out_free_window;
>   	}
>   
> -	window->device = pdn;
> -	window->prop = ddwprop;
>   	spin_lock(&direct_window_list_lock);
>   	list_add(&window->list, &direct_window_list);
>   	spin_unlock(&direct_window_list_lock);
>