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

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Date:   Mon, 8 Apr 2019 12:00:12 +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: [PATCH] mm/memory_hotplug: Do not unlock when fails to take the device_hotplug_lock

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,
-- 
1.7.12.4