linux-kernel - Re: [PATCH 1/2] of: handle both '/' and ':' in path strings

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Date:	Tue, 17 Mar 2015 21:11:39 +0000
From:	Leif Lindholm <leif.lindholm@...aro.org>
To:	Brian Norris <computersforpeace@...il.com>
Cc:	Rob Herring <robh@...nel.org>,
	Peter Hurley <peter@...leysoftware.com>,
	stable@...r.kernel.org, Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] of: handle both '/' and ':' in path strings

On Tue, Mar 17, 2015 at 12:30:31PM -0700, Brian Norris wrote:
> Commit 106937e8ccdc ("of: fix handling of '/' in options for
> of_find_node_by_path()") caused a regression in OF handling of
> stdout-path. While it fixes some cases which have '/' after the ':', it
> breaks cases where there is more than one '/' *before* the ':'.
> 
> For example, it breaks this boot string
> 
>   stdout-path = "/rdb/serial@...0ab00:115200";
> 
> So rather than doing sequentialized checks (first for '/', then for ':';
> or vice versa), to get the correct behavior we need to check for the
> first occurrence of either one of them.
> 
> It so happens that the handy strcspn() helper can do just that.
> 
> Fixes: 106937e8ccdc ("of: fix handling of '/' in options for of_find_node_by_path()")
> Signed-off-by: Brian Norris <computersforpeace@...il.com>
> Cc: stable@...r.kernel.org
> ---
> This is for -stable only because the regression is marked for stable. Not sure
> the first one deserves to go to -stable, actually...
> 
>  drivers/of/base.c | 7 +------
>  1 file changed, 1 insertion(+), 6 deletions(-)
> 
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index adb8764861c0..966d6fdcf427 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -715,13 +715,8 @@ static struct device_node *__of_find_node_by_path(struct device_node *parent,
>  {
>  	struct device_node *child;
>  	int len;
> -	const char *end;
>  
> -	end = strchr(path, ':');
> -	if (!end)
> -		end = strchrnul(path, '/');
> -
> -	len = end - path;
> +	len = strcspn(path, "/:");
>  	if (!len)
>  		return NULL;
>  
> -- 
> 1.9.1

Yeah, that's neater that the fix I sent out earlier today.

Acked-by: Leif Lindholm <leif.lindholm@...aro.org>
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