staging: comedi: usbdux: tidy up usbdux_ai_inttrig()

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Rename the local variable used for the private data pointer to the
comedi "norm".

Remove the unnecessary sanity check of the private data pointer. This
function can only be called is the private data was allocated during
the attach.

Tidy up the exit path using goto to ensure that the semaphore is
released.

Return -EBUSY if an ai command is already running.

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 2013-07-25 16:03:15 -07:00 • committed by Greg Kroah-Hartman

parent 9c922a9076

commit e5cb2f9498

1 changed files with 18 additions and 17 deletions

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drivers/staging/comedi/drivers/usbdux.c

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