[PATCH] Drivers: hv: vmbus: Fix harmless building warnings without CONFIG_PM

[Dexuan Cui]

If CONFIG_PM is not set, we can comment out these functions to avoid the
below warnings:

drivers/hv/vmbus_drv.c:2208:12: warning: âvmbus_bus_resumeâ defined but not used [-Wunused-function]
drivers/hv/vmbus_drv.c:2128:12: warning: âvmbus_bus_suspendâ defined but not used [-Wunused-function]
drivers/hv/vmbus_drv.c:937:12: warning: âvmbus_resumeâ defined but not used [-Wunused-function]
drivers/hv/vmbus_drv.c:918:12: warning: âvmbus_suspendâ defined but not used [-Wunused-function]

Fixes: 271b2224d42f ("Drivers: hv: vmbus: Implement suspend/resume for VSC drivers for hibernation")
Fixes: f53335e3289f ("Drivers: hv: vmbus: Suspend/resume the vmbus itself for hibernation")
Reported-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Dexuan Cui <decui@xxxxxxxxxxxxx>
---
 drivers/hv/vmbus_drv.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 391f0b225c9a..8bfb36695413 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -912,6 +912,7 @@ static void vmbus_shutdown(struct device *child_device)
 		drv->shutdown(dev);
 }
 
+#ifdef CONFIG_PM
 /*
  * vmbus_suspend - Suspend a vmbus device
  */
@@ -949,6 +950,7 @@ static int vmbus_resume(struct device *child_device)
 
 	return drv->resume(dev);
 }
+#endif /* CONFIG_PM */
 
 /*
  * vmbus_device_release - Final callback release of the vmbus child device
@@ -1070,6 +1072,7 @@ void vmbus_on_msg_dpc(unsigned long data)
 	vmbus_signal_eom(msg, message_type);
 }
 
+#ifdef CONFIG_PM
 /*
  * Fake RESCIND_CHANNEL messages to clean up hv_sock channels by force for
  * hibernation, because hv_sock connections can not persist across hibernation.
@@ -1105,6 +1108,7 @@ static void vmbus_force_channel_rescinded(struct vmbus_channel *channel)
 		      vmbus_connection.work_queue,
 		      &ctx->work);
 }
+#endif /* CONFIG_PM */
 
 /*
  * Direct callback for channels using other deferred processing
@@ -2125,6 +2129,7 @@ static int vmbus_acpi_add(struct acpi_device *device)
 	return ret_val;
 }
 
+#ifdef CONFIG_PM
 static int vmbus_bus_suspend(struct device *dev)
 {
 	struct vmbus_channel *channel, *sc;
@@ -2247,6 +2252,7 @@ static int vmbus_bus_resume(struct device *dev)
 
 	return 0;
 }
+#endif /* CONFIG_PM */
 
 static const struct acpi_device_id vmbus_acpi_device_ids[] = {
 	{"VMBUS", 0},
-- 
2.19.1