can: c_can: Make it SMP safe

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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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Thomas Gleixner 2014-03-18 17:19:09 +00:00 • committed by Marc Kleine-Budde

parent 5bb9cbaa62

commit 640916db2b

1 changed files with 21 additions and 15 deletions

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drivers/net/can/c_can/c_can.c

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