linux-kernel - [PATCH 1/2] Drivers: base: core: Export functions to lock/unlock device hotplug lock

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Message-Id: <1417826498-21172-1-git-send-email-kys@microsoft.com>
Date:	Fri,  5 Dec 2014 16:41:37 -0800
From:	"K. Y. Srinivasan" <kys@...rosoft.com>
To:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
	linux-mm@...ck.org, isimatu.yasuaki@...fujitsu.com
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH 1/2] Drivers: base: core: Export functions to lock/unlock device hotplug lock

The Hyper-V balloon driver does memory hot-add. The device_hotplug_lock
is designed to address AB BA deadlock issues between the hot-add path
and the sysfs path. Export the APIs to acquire and release the
device_hotplug_lock for use by loadable modules that want to
hot-add memory or CPU.

Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
---
 drivers/base/core.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 97e2baf..b3073af 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -55,11 +55,13 @@ void lock_device_hotplug(void)
 {
 	mutex_lock(&device_hotplug_lock);
 }
+EXPORT_SYMBOL_GPL(lock_device_hotplug);
 
 void unlock_device_hotplug(void)
 {
 	mutex_unlock(&device_hotplug_lock);
 }
+EXPORT_SYMBOL_GPL(unlock_device_hotplug);
 
 int lock_device_hotplug_sysfs(void)
 {
-- 
1.7.4.1

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