From: Oliver Hartkopp <socketcan@hartkopp.net>
Date: Wed, 15 Feb 2012 16:51:56 +0000 (+0100)
Subject: can: sja1000: fix isr hang when hw is unplugged under load
X-Git-Tag: v3.2.9~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9bda01cc81b40639565e63223d7c5413bb15b99a;p=pandora-kernel.git

can: sja1000: fix isr hang when hw is unplugged under load

commit a7762b10c12a70c5dbf2253142764b728ac88c3a upstream.

In the case of hotplug enabled devices (PCMCIA/PCIeC) the removal of the
hardware can cause an infinite loop in the common sja1000 isr.

Use the already retrieved status register to indicate a possible hardware
removal and double check by reading the mode register in sja1000_is_absent.

Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

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