can: kvaser_usb: Fix state handling upon BUS_ERROR events

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commit e638642b08 upstream.

While being in an ERROR_WARNING state, and receiving further
bus error events with error counters still in the ERROR_WARNING
range of 97-127 inclusive, the state handling code erroneously
reverts back to ERROR_ACTIVE.

Per the CAN standard, only revert to ERROR_ACTIVE when the
error counters are less than 96.

Moreover, in certain Kvaser models, the BUS_ERROR flag is
always set along with undefined bits in the M16C status
register. Thus use bitwise operators instead of full equality
for checking that register against bus errors.

Signed-off-by: Ahmed S. Darwish <ahmed.darwish@valeo.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Ahmed S. Darwish 2015-01-26 07:25:43 +02:00 • committed by Greg Kroah-Hartman

parent 163113183b

commit 91ea34506c

1 changed files with 3 additions and 4 deletions

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drivers/net/can/usb/kvaser_usb.c

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