From: Thomas Gleixner <tglx@linutronix.de>
Date: Tue, 18 Mar 2014 17:19:09 +0000 (+0000)
Subject: can: c_can: Make it SMP safe
X-Git-Tag: v3.15-rc1~113^2~2^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=640916db2bf7de7c5ac13a1f470fa959459ccf6d;p=pandora-kernel.git

can: c_can: Make it SMP safe

The hardware has two message control interfaces, but the code only uses the
first one. So on SMP the following can be observed:

CPU0 	       	CPU1
rx_poll()
  write IF1	xmit()
		write IF1
  write IF1

That results in corrupted message object configurations. The TX/RX is not
globally serialized it's only serialized on a core.

Simple solution: Let RX use IF1 and TX use IF2 and all is good.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---

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