linux-kernel - Re: [PATCH 03/12] staging: lustre: One function call less in class_register

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Date:	Tue, 26 Jul 2016 15:08:14 -0400
From:	Oleg Drokin <oleg.drokin@...el.com>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:	<devel@...verdev.osuosl.org>, <lustre-devel@...ts.lustre.org>,
	"Andreas Dilger" <andreas.dilger@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	<kernel-janitors@...r.kernel.org>,
	Julia Lawall <julia.lawall@...6.fr>,
	Bhumika Goyal <bhumirks@...il.com>
Subject: Re: [PATCH 03/12] staging: lustre: One function call less in class_register_type() after error detection


On Jul 26, 2016, at 3:02 PM, SF Markus Elfring wrote:

> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Tue, 26 Jul 2016 13:40:47 +0200
> 
> The kobject_put() function was called in a few cases by the
> class_register_type() function during error handling even if the passed
> data structure element did not contain a pointer for a valid data item.

But kobject_put() already checks for NULL, right? you just submitted
another batch about that in other area.

> Adjust jump targets according to the Linux coding style convention.

Not that I am totally against this patch, but when we do not need the extra
checks, a single jump target is ok too in my mind (extra benefit - there's
not going to be any chance of a mistake to where to jump to).
And when we have a single jump target, there's no supersmart naming
like free_this_and_that_and_that_other_thing_too.

> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
> drivers/staging/lustre/lustre/obdclass/genops.c | 12 ++++++------
> 1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/staging/lustre/lustre/obdclass/genops.c b/drivers/staging/lustre/lustre/obdclass/genops.c
> index 1b5aa9b..10dd145 100644
> --- a/drivers/staging/lustre/lustre/obdclass/genops.c
> +++ b/drivers/staging/lustre/lustre/obdclass/genops.c
> @@ -164,7 +164,7 @@ int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops,
> 	if (!type->typ_dt_ops ||
> 	    !type->typ_md_ops ||
> 	    !type->typ_name)
> -		goto failed;
> +		goto free_name;
> 
> 	*(type->typ_dt_ops) = *dt_ops;
> 	/* md_ops is optional */
> @@ -180,20 +180,20 @@ int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops,
> 		rc = type->typ_debugfs_entry ? PTR_ERR(type->typ_debugfs_entry)
> 					     : -ENOMEM;
> 		type->typ_debugfs_entry = NULL;
> -		goto failed;
> +		goto free_name;
> 	}
> 
> 	type->typ_kobj = kobject_create_and_add(type->typ_name, lustre_kobj);
> 	if (!type->typ_kobj) {
> 		rc = -ENOMEM;
> -		goto failed;
> +		goto free_name;
> 	}
> 
> 	if (ldt) {
> 		type->typ_lu = ldt;
> 		rc = lu_device_type_init(ldt);
> 		if (rc != 0)
> -			goto failed;
> +			goto put_object;
> 	}
> 
> 	spin_lock(&obd_types_lock);
> @@ -201,9 +201,9 @@ int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops,
> 	spin_unlock(&obd_types_lock);
> 
> 	return 0;
> -
> - failed:
> +put_object:
> 	kobject_put(type->typ_kobj);
> +free_name:
> 	kfree(type->typ_name);
> 	kfree(type->typ_md_ops);
> 	kfree(type->typ_dt_ops);
> -- 
> 2.9.2