linux-kernel - Re: Subject: [PATCH] kobject: fix the race between kobject_del and get_device

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Date:	Tue, 4 Nov 2014 22:29:43 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Yijing Wang <wangyijing@...wei.com>
Cc:	Weng Meiling <wengmeiling.weng@...wei.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Frans Klaver <fransklaver@...il.com>,
	Jens Axboe <axboe@...nel.dk>, akpm@...ux-foundation.org,
	adilger.kernel@...ger.ca, Jan Kara <jack@...e.cz>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Xiang Rui <rui.xiang@...wei.com>,
	Li Zefan <lizefan@...wei.com>,
	Huang Qiang <h.huangqiang@...wei.com>,
	Zhao Hongjiang <zhaohongjiang@...wei.com>
Subject: Re: Subject: [PATCH] kobject: fix the race between kobject_del and
 get_device_parent

Hello,

On Wed, Nov 05, 2014 at 11:27:39AM +0800, Yijing Wang wrote:
> Keep the parent directory looks good to me,  we could only add kobject_get(&parent)
> after the parent dir be created.
> 
> ....
> 		/* or create a new class-directory at the parent device */
> 		k = class_dir_create_and_add(dev->class, parent_kobj);
> 		/* do not emit an uevent for this simple "glue" directory */
> 		kobject_get(k);  <--------add parent ref count for first child device.

The created directory would already have the base ref.  I don't think
you need the above.  Just never put the parent once created.

Greg, how does this sound to you?

Thanks.

-- 
tejun
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