linux-kernel - Re: [PATCH] ARM: at91: pm: add missing put_device() call in at91_pm_sram

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Date:   Wed, 24 Jun 2020 16:46:44 +0800
From:   "yukuai (C)" <yukuai3@...wei.com>
To:     <linux@...linux.org.uk>, <nicolas.ferre@...rochip.com>,
        <alexandre.belloni@...tlin.com>, <ludovic.desroches@...rochip.com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <yi.zhang@...wei.com>
Subject: Re: [PATCH] ARM: at91: pm: add missing put_device() call in
 at91_pm_sram_init()

ping?

On 2020/6/4 20:33, yu kuai wrote:
> if of_find_device_by_node() succeed, at91_pm_sram_init() doesn't have
> a corresponding put_device(). Thus add a jump target to fix the exception
> handling for this function implementation.
> 
> Fixes: d2e467905596 ("ARM: at91: pm: use the mmio-sram pool to access SRAM")
> Signed-off-by: yu kuai <yukuai3@...wei.com>
> ---
>   arch/arm/mach-at91/pm.c | 11 ++++++++---
>   1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
> index 074bde64064e..2aab043441e8 100644
> --- a/arch/arm/mach-at91/pm.c
> +++ b/arch/arm/mach-at91/pm.c
> @@ -592,13 +592,13 @@ static void __init at91_pm_sram_init(void)
>   	sram_pool = gen_pool_get(&pdev->dev, NULL);
>   	if (!sram_pool) {
>   		pr_warn("%s: sram pool unavailable!\n", __func__);
> -		return;
> +		goto out_put_device;
>   	}
>   
>   	sram_base = gen_pool_alloc(sram_pool, at91_pm_suspend_in_sram_sz);
>   	if (!sram_base) {
>   		pr_warn("%s: unable to alloc sram!\n", __func__);
> -		return;
> +		goto out_put_device;
>   	}
>   
>   	sram_pbase = gen_pool_virt_to_phys(sram_pool, sram_base);
> @@ -606,12 +606,17 @@ static void __init at91_pm_sram_init(void)
>   					at91_pm_suspend_in_sram_sz, false);
>   	if (!at91_suspend_sram_fn) {
>   		pr_warn("SRAM: Could not map\n");
> -		return;
> +		goto out_put_device;
>   	}
>   
>   	/* Copy the pm suspend handler to SRAM */
>   	at91_suspend_sram_fn = fncpy(at91_suspend_sram_fn,
>   			&at91_pm_suspend_in_sram, at91_pm_suspend_in_sram_sz);
> +	return;
> +
> +out_put_device:
> +	put_device(&pdev->dev);
> +	return;
>   }
>   
>   static bool __init at91_is_pm_mode_active(int pm_mode)
>