From 045d2da9950528ec72f06fbb1cb2b981c2541ba0 Mon Sep 17 00:00:00 2001
From: Gerhard Uttenthaler <uttenthaler@ems-wuensche.com>
Date: Tue, 22 Dec 2015 17:29:16 +0100
Subject: [PATCH] can: ems_usb: Fix possible tx overflow

commit 90cfde46586d2286488d8ed636929e936c0c9ab2 upstream.

This patch fixes the problem that more CAN messages could be sent to the
interface as could be send on the CAN bus. This was more likely for slow baud
rates. The sleeping _start_xmit was woken up in the _write_bulk_callback. Under
heavy TX load this produced another bulk transfer without checking the
free_slots variable and hence caused the overflow in the interface.

Signed-off-by: Gerhard Uttenthaler <uttenthaler@ems-wuensche.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
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