tree a570007ef70aa5065637836bd0cf33f1d302b847
parent 5b7b0eb2b208d3ecdaf946876f6c0f9cf292ddf2
author H Hartley Sweeten <hsweeten@visionengravers.com> 1385509319 -0700
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1386091221 -0800

staging: comedi: dt282x: tidy up the irq support in dt282x_attach()

An irq is only needed by this driver in order to support async commands.
Since it is optional, modify the attach so that if the request_irq() fails
the attach does not fail.

Remove the printk noise about the irq.

Only hookup the async command support if the request_irq() was successful.

Also, only call dt282x_grab_dma() if we have an irq since interrupt support
is needed to support dma.

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>