linux-kernel - Re: [PATCH] regulator: Ensure unique regulator debugfs directory names

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Message-ID: <20141117210009.GA28122@roeck-us.net>
Date:	Mon, 17 Nov 2014 13:00:09 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Mark Brown <broonie@...nel.org>
Cc:	Liam Girdwood <lgirdwood@...il.com>, linux-kernel@...r.kernel.org,
	Alan Tull <atull@...nsource.altera.com>
Subject: Re: [PATCH] regulator: Ensure unique regulator debugfs directory
 names

On Fri, Oct 17, 2014 at 08:17:03AM -0700, Guenter Roeck wrote:
> If multiple regulator devices of the same type exist in a system,
> the regulator driver assigns generic names for the regulators it
> provides, and debugfs is enabled, the regulator subsystem attempts
> to create multiple entries with the same name in the regulator debugfs
> directory. This fails for all but the first regulator, resulting in
> multiple "Failed to create debugfs directory" log entries.
> 
> To avoid the problem, prepend the debugfs directory name for a regulator
> with its parent device name if available, but only if no explicit
> regulator name was provided.
> 
> Cc: Alan Tull <atull@...nsource.altera.com>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>

Hi Mark,

did you have time to look into this patch ?

Thanks,
Guenter

> ---
>  drivers/regulator/core.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
> index cd87c0c..92f7a53 100644
> --- a/drivers/regulator/core.c
> +++ b/drivers/regulator/core.c
> @@ -3538,7 +3538,18 @@ static int add_regulator_attributes(struct regulator_dev *rdev)
>  
>  static void rdev_init_debugfs(struct regulator_dev *rdev)
>  {
> -	rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
> +	struct device *parent = rdev->dev.parent;
> +	const char *rname = rdev_get_name(rdev);
> +	char name[NAME_MAX];
> +
> +	/* Avoid duplicate debugfs directory names */
> +	if (parent && rname == rdev->desc->name) {
> +		snprintf(name, sizeof(name), "%s-%s", dev_name(parent),
> +			 rname);
> +		rname = name;
> +	}
> +
> +	rdev->debugfs = debugfs_create_dir(rname, debugfs_root);
>  	if (!rdev->debugfs) {
>  		rdev_warn(rdev, "Failed to create debugfs directory\n");
>  		return;
> -- 
> 1.9.1
> 
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