Drivers: hv: vmbus: Fix a bug in vmbus_establish_gpadl()

Correctly compute the local (gpadl) handle.
I would like to thank Michael Brown <mcb30@ipxe.org> for seeing this bug.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reported-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 433f72a1c006..c76ffbe59f65 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -366,8 +366,8 @@ int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer,
         unsigned long flags;
         int ret = 0;
 
-        next_gpadl_handle = atomic_read(&vmbus_connection.next_gpadl_handle);
-        atomic_inc(&vmbus_connection.next_gpadl_handle);
+        next_gpadl_handle =
+                (atomic_inc_return(&vmbus_connection.next_gpadl_handle) - 1);
 
         ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount);
         if (ret)