Re: [PATCH] ax88179_178a: don't send commands to detached device

On Wed, 14 May 2014, Emil Goode wrote:

The .stop and .unbind callbacks of struct driver_info are
called even after a DETACH hot-plug event. In the case of
the ax88179_178a minidriver we need to make sure we are not
trying to send commands to a device that has been detached.
This leads to failure messages like below.

ax88179_178a 1-1.3:1.0 (unregistered net_device):
	Failed to write reg index 0x0001: -19

Most driver don't bother to do this.  A few error messages in the log 
when a device gets unplugged are harmless.  Besides, this won't help 
with errors that occur between the time the device is unplugged and the 
time when the unbind callback runs.

Alan Stern