linux-kernel - Re: [PATCH] mm/memory_hotplug: Do not unlock when fails to take the device_hotplug

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Date:   Mon, 8 Apr 2019 12:10:37 +0800
From:   zhong jiang <zhongjiang@...wei.com>
To:     <akpm@...ux-foundation.org>, <rafael@...nel.org>,
        <david@...hat.com>, <rafael.j.wysocki@...el.com>,
        <mhocko@...e.com>, <osalvador@...e.de>
CC:     <vbabka@...e.cz>, <iamjoonsoo.kim@....com>,
        <bsingharora@...il.com>, <gregkh@...uxfoundation.org>,
        <yangyingliang@...wei.com>, <linux-kernel@...r.kernel.org>,
        <linux-mm@...ck.org>
Subject: Re: [PATCH] mm/memory_hotplug: Do not unlock when fails to take the
 device_hotplug_lock

I am sorry,  It is incorrect.  please ignore the patch.  I will resent it.

Thanks,
zhong jiang
On 2019/4/8 12:00, zhong jiang wrote:
> When adding the memory by probing memory block in sysfs interface, there is an
> obvious issue that we will unlock the device_hotplug_lock when fails to takes it.
>
> That issue was introduced in Commit 8df1d0e4a265
> ("mm/memory_hotplug: make add_memory() take the device_hotplug_lock")
>
> We should drop out in time when fails to take the device_hotplug_lock.
>
> Fixes: 8df1d0e4a265 ("mm/memory_hotplug: make add_memory() take the device_hotplug_lock")
> Reported-by: Yang yingliang <yangyingliang@...wei.com>
> Signed-off-by: zhong jiang <zhongjiang@...wei.com>
> ---
>  drivers/base/memory.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/base/memory.c b/drivers/base/memory.c
> index d9ebb89..8b0cec7 100644
> --- a/drivers/base/memory.c
> +++ b/drivers/base/memory.c
> @@ -507,7 +507,7 @@ static ssize_t probe_store(struct device *dev, struct device_attribute *attr,
>  
>  	ret = lock_device_hotplug_sysfs();
>  	if (ret)
> -		goto out;
> +		goto ret;
>  
>  	nid = memory_add_physaddr_to_nid(phys_addr);
>  	ret = __add_memory(nid, phys_addr,