Subject: [PATCH v2] ARM: at91: pm: fix SRAM allocation

From: [email-masked] (Nicolas Ferre)
Date: Tue, 3 Mar 2015 19:21:21 +0100

Le 03/03/2015 08:38, Alexandre Belloni a ?crit :
> On some platforms, there are multiple SRAM nodes defined in the device tree but
> some of them are disabled, leading to allocation failure. Try to find the first
> enabled SRAM node and allocate from it.
> 
> Signed-off-by: Alexandre Belloni <[email-masked]>
> Tested-by: Wenyou Yang <[email-masked]>

Acked-by: Nicolas Ferre <[email-masked]>
and added to at91-4.0-fixes. Thanks.

> ---
> Changes in v2:
>  - initialize pdev to NULL
> 
>  arch/arm/mach-at91/pm.c | 22 ++++++++++------------
>  1 file changed, 10 insertions(+), 12 deletions(-)
> 
> diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
> index 5e34fb143309..aa4116e9452f 100644
> --- a/arch/arm/mach-at91/pm.c
> +++ b/arch/arm/mach-at91/pm.c
> @@ -270,37 +270,35 @@ static void __init at91_pm_sram_init(void)
>  	phys_addr_t sram_pbase;
>  	unsigned long sram_base;
>  	struct device_node *node;
> -	struct platform_device *pdev;
> +	struct platform_device *pdev = NULL;
>  
> -	node = of_find_compatible_node(NULL, NULL, "mmio-sram");
> -	if (!node) {
> -		pr_warn("%s: failed to find sram node!\n", __func__);
> -		return;
> +	for_each_compatible_node(node, NULL, "mmio-sram") {
> +		pdev = of_find_device_by_node(node);
> +		if (pdev) {
> +			of_node_put(node);
> +			break;
> +		}
>  	}
>  
> -	pdev = of_find_device_by_node(node);
>  	if (!pdev) {
>  		pr_warn("%s: failed to find sram device!\n", __func__);
> -		goto put_node;
> +		return;
>  	}
>  
>  	sram_pool = dev_get_gen_pool(&pdev->dev);
>  	if (!sram_pool) {
>  		pr_warn("%s: sram pool unavailable!\n", __func__);
> -		goto put_node;
> +		return;
>  	}
>  
>  	sram_base = gen_pool_alloc(sram_pool, at91_slow_clock_sz);
>  	if (!sram_base) {
>  		pr_warn("%s: unable to alloc ocram!\n", __func__);
> -		goto put_node;
> +		return;
>  	}
>  
>  	sram_pbase = gen_pool_virt_to_phys(sram_pool, sram_base);
>  	slow_clock = __arm_ioremap_exec(sram_pbase, at91_slow_clock_sz, false);
> -
> -put_node:
> -	of_node_put(node);
>  }
>  #endif
>  
> 

-- 
Nicolas Ferre