From aa8e22128b40590b291cd13512098bf258a7e6c5 Mon Sep 17 00:00:00 2001
From: Jeremiah Mahler <jmmahler@gmail.com>
Date: Sun, 11 Jan 2015 05:42:06 -0800
Subject: [PATCH] usb: serial: silence all non-critical read errors

If a USB serial device is unplugged while there is an active program
using the device it may spam the logs with -EPROTO (71) messages as it
attempts to retry.

Most serial usb drivers (metro-usb, pl2303, mos7840, ...) only output
these messages for debugging.  The generic driver treats these as
errors.

Change the default output for the generic serial driver from error to
debug to silence these non-critical errors.

Signed-off-by: Jeremiah Mahler <jmmahler@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
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