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

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Message-ID: <20190408054238.GB18103@dhcp22.suse.cz>
Date:   Mon, 8 Apr 2019 07:42:38 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     zhong jiang <zhongjiang@...wei.com>
Cc:     akpm@...ux-foundation.org, rafael@...nel.org, david@...hat.com,
        rafael.j.wysocki@...el.com, osalvador@...e.de, 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: [RESENT PATCH] mm/memory_hotplug: Do not unlock when fails to
 take the device_hotplug_lock

On Mon 08-04-19 12:07:17, 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>

Acked-by: Michal Hocko <mhocko@...e.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..0c9e22f 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;
> +		return ret;
>  
>  	nid = memory_add_physaddr_to_nid(phys_addr);
>  	ret = __add_memory(nid, phys_addr,
> -- 
> 1.7.12.4
> 

-- 
Michal Hocko
SUSE Labs