can: sja1000_isa: add locking for indirect register access mode

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When accessing the SJA1000 controller registers in the indirect access mode,
writing the register number and reading/writing the data has to be an atomic
attempt.

As the sja1000_isa driver is an old style driver with a fixed number of
instances the locking variable depends on the same index like all the other
configuration elements given on the module command line.

As a positive side effect dev->dev_id is populated by the instance index,
which was missing in 3e66d0138c ("can: populate netdev::dev_id for udev
discrimination").

Reported-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

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Oliver Hartkopp 2014-04-15 19:30:00 +02:00 • committed by Marc Kleine-Budde

parent 78c181bc8a

commit a9edcdedbd

1 changed files with 13 additions and 3 deletions

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drivers/net/can/sja1000/sja1000_isa.c

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