From: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Well require to call add_memory()/add_memory_resource() with
device_hotplug_lock held, to avoid a lock inversion. Allow external modules
(e.g. hv_balloon) that make use of add_memory()/add_memory_resource() to
lock device hotplug.
Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
[modify patch description]
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
---
drivers/base/core.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 04bbcd779e11..9010b9e942b5 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -700,11 +700,13 @@ 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)
{
--
2.17.1
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