Commit 84672369 authored Jun 14, 2013 by Fernando Soto Committed by Greg Kroah-Hartman Jul 16, 2013

Drivers: hv: vmbus: incorrect device name is printed when child device is unregistered



Whenever a device is unregistered in vmbus_device_unregister (drivers/hv/vmbus_drv.c), the device name in the log message may contain garbage as the memory has already been freed by the time pr_info is called. Log example:
 [ 3149.170475] hv_vmbus: child device àõsèè0_5 unregistered

By logging the message just before calling device_unregister, the correct device name is printed:
[ 3145.034652] hv_vmbus: child device vmbus_0_5 unregistered

Also changing register & unregister messages to debug to avoid unnecessarily cluttering the kernel log.

Signed-off-by: Fernando M Soto <fsoto@bluecatnetworks.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent ad81f054

drivers/hv/vmbus_drv.c

+4 −4

Original line number	Diff line number	Diff line
		@@ -690,7 +690,7 @@ int vmbus_device_register(struct hv_device *child_device_obj)
		if (ret)
		pr_err("Unable to register child device\n");
		else
		pr_info("child device %s registered\n",
		pr_debug("child device %s registered\n",
		dev_name(&child_device_obj->device));

		return ret;
		@@ -702,14 +702,14 @@ int vmbus_device_register(struct hv_device *child_device_obj)
		*/
		void vmbus_device_unregister(struct hv_device *device_obj)
		{
		pr_debug("child device %s unregistered\n",
		dev_name(&device_obj->device));

		/*
		* Kick off the process of unregistering the device.
		* This will call vmbus_remove() and eventually vmbus_device_release()
		*/
		device_unregister(&device_obj->device);

		pr_info("child device %s unregistered\n",
		dev_name(&device_obj->device));
		}