[PATCH 1/3] driver core: export lock_device_hotplug/unlock_device_hotplug

Vitaly Kuznetsov
2015-02-11T15:44:49Z

add_memory() is supposed to be run with device_hotplug_lock grabbed, otherwise
it can race with e.g. device_online(). Allow external modules (hv_balloon for
now) to lock device hotplug.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
drivers/base/core.c | 2 ++
1 file changed, 2 insertions(+)

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)
{
--
1.9.3