linux-kernel - Re: [PATCH] net-sysfs: call dev_hold if kobject_init_and

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Date:   Tue, 19 Mar 2019 13:46:45 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     yuehaibing@...wei.com
Cc:     idosch@...lanox.com, alexander.h.duyck@...el.com,
        tyhicks@...onical.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH] net-sysfs: call dev_hold if kobject_init_and_add
 success

From: Yue Haibing <yuehaibing@...wei.com>
Date: Tue, 19 Mar 2019 10:16:53 +0800

> From: YueHaibing <yuehaibing@...wei.com>
> 
> In netdev_queue_add_kobject and rx_queue_add_kobject,
> if sysfs_create_group failed, kobject_put will call
> netdev_queue_release to decrease dev refcont, however
> dev_hold has not be called. So we will see this while
> unregistering dev:
> 
> unregister_netdevice: waiting for bcsh0 to become free. Usage count = -1
> 
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Fixes: d0d668371679 ("net: don't decrement kobj reference count on init failure")
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>

Applied and queued up for -stable.