linux-kernel - Re: [PATCH 2/2] kobjects: Transmit return value of kobject_uevent

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Date:	Tue, 24 Jun 2008 16:24:48 +0200
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	Wang Chen <wangchen@...fujitsu.com>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] kobjects: Transmit return value of
 kobject_uevent_env() to caller

On Tue, 24 Jun 2008 16:59:06 +0800,
Wang Chen <wangchen@...fujitsu.com> wrote:

> The error signal shouldn't be dropped.
> 
> Signed-off-by: Wang Chen <wangchen@...fujitsu.com>
> ---
> diff --git a/lib/kobject.c b/lib/kobject.c
> index 718e510..e5de71e 100644
> --- a/lib/kobject.c
> +++ b/lib/kobject.c
> @@ -430,7 +430,7 @@ int kobject_rename(struct kobject *kobj, const char *new_name)
>  	 * Some hotplug package track interfaces by their name and
>  	 * therefore want to know when the name is changed by the user. */
>  	if (!error)
> -		kobject_uevent_env(kobj, KOBJ_MOVE, envp);
> +		error = kobject_uevent_env(kobj, KOBJ_MOVE, envp);
> 
>  out:
>  	kfree(devpath_string);
> @@ -482,7 +482,7 @@ int kobject_move(struct kobject *kobj, struct kobject *new_parent)
>  	kobj->parent = new_parent;
>  	new_parent = NULL;
>  	kobject_put(old_parent);
> -	kobject_uevent_env(kobj, KOBJ_MOVE, envp);
> +	error = kobject_uevent_env(kobj, KOBJ_MOVE, envp);
>  out:
>  	kobject_put(new_parent);
>  	kobject_put(kobj);
> 
> 
> 

This looks wrong. If everything went right except sending the uevent,
you'll make the caller believe that the whole operation failed, while
in reality the sysfs operation succeeded. Either just drop the error
again (or print a warning), or undo the previous operations on error
(which may fail).
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