staging: comedi: addi_apci_2032: interrupt safety change

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Put the hardware into a safe state before enabling the interrupt.  In
the interrupt routine, check the device has been fully configured by
checking `dev->attached`.  In particular, `dev->read_subdev` could be
NULL early on and although the hardware's status register should
indicate no interrupt has occurred (since it's been put into a safe
state), it's better not to rely on it.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Ian Abbott 2012-12-03 18:15:40 +00:00 • committed by Greg Kroah-Hartman

parent d9f5420268

commit 0774c2b5c1

1 changed files with 4 additions and 1 deletions

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drivers/staging/comedi/drivers/addi_apci_2032.c

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