linux-kernel - Re: [PATCH] EDAC, altera: Add missing of_node

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Message-ID: <64c210a5-41d2-2f62-e3d5-ac9c14841858@linux.intel.com>
Date:   Thu, 14 Feb 2019 10:15:20 -0600
From:   Thor Thayer <thor.thayer@...ux.intel.com>
To:     Huang Zijiang <huang.zijiang@....com.cn>
Cc:     bp@...en8.de, mchehab@...nel.org, linux-edac@...r.kernel.org,
        linux-kernel@...r.kernel.org, wang.yi59@....com.cn
Subject: Re: [PATCH] EDAC, altera: Add missing of_node_put()

Hi,

On 2/14/19 12:39 AM, Huang Zijiang wrote:
> The call to of_parse_phandle returns a node pointer with refcount
> incremented thus it must be explicitly decremented here after the last
> usage.
> 
> Signed-off-by: Huang Zijiang <huang.zijiang@....com.cn>
> ---
>   drivers/edac/altera_edac.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c
> index c89d82a..1bcd778 100644
> --- a/drivers/edac/altera_edac.c
> +++ b/drivers/edac/altera_edac.c
> @@ -1046,14 +1046,17 @@ altr_init_a10_ecc_block(struct device_node *np, u32 irq_mask,
>   			return -ENODEV;
>   		}
>   
> -		if (of_address_to_resource(sysmgr_np, 0, &res))
> +		if (of_address_to_resource(sysmgr_np, 0, &res)) {
> +			of_node_put(sysmgr_np);
>   			return -ENOMEM;
> +		}
>   
>   		/* Need physical address for SMCC call */
>   		base = res.start;
>   
>   		ecc_mgr_map = regmap_init(NULL, NULL, (void *)base,
>   					  &s10_sdram_regmap_cfg);
> +		of_node_put(sysmgr_np);
>   	}
>   	of_node_put(np_eccmgr);
>   	if (IS_ERR(ecc_mgr_map)) {
> 

Yes, I missed the error path. I mistakingly thought 
of_node_put(np_eccmgr) would catch the exit of both branches but I 
declared sysmgr_np instead of re-using np_eccmgr. I'll clean that up in 
a separate patch (actually this code will disappear when my combined 
sysmgr patchset is accepted upstream).

Thanks!

Reviewed-by: Thor Thayer <thor.thayer@...ux.intel.com>