staging: comedi: ni_mio_common: fix interrupt handler for dev->read_subdev

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There may not be a dev->read_subdev, i.e. an analog input subdevice, that
supports async commands. If it doesn't exist the interrupt/dma will never
be enabled.  Fix ni_E_interrupt() so that the analog input subdevice is
only handled if it exists.

This also fixes minor NULL dereference issue in handle_a_interrupt().
If the dev->read_subdev is NULL the comedi_async pointer (s->async) will
not be allocated by the device postconfig so there is no way to get a
valid comedi_cmd (&s->async->cmd).

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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H Hartley Sweeten 2016-04-21 12:04:41 -07:00 • committed by Greg Kroah-Hartman

parent 4b2d73898f

commit ba5c0da886

1 changed files with 9 additions and 13 deletions

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drivers/staging/comedi/drivers/ni_mio_common.c

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