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staging: comedi: usbduxsigma: return failure of auto attach 

The function usbduxsigma_getstatusinfo() returns a negative
value in case there has been a communication error with
the board. This should always work and if this communication
fails then there is something seriously wrong with the board.
This is now returned to the caller so that it can
terminte the auto attachement. The return command also prevents
printing out the offset value in case of a fault.

Signed-off-by: Bernd Porr <mail@berndporr.me.uk>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bernd Porr 2014-01-07 21:43:10 +00:00 committed by Greg Kroah-Hartman
parent bcb6232d09
commit 7a45ae6edf
1 changed files with 4 additions and 2 deletions
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6
drivers/staging/comedi/drivers/usbduxsigma.c
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@ -1655,9 +1655,11 @@ static int usbduxsigma_auto_attach(struct comedi_device *dev,
}
offset = usbduxsigma_getstatusinfo(dev, 0);
if (offset < 0)
if (offset < 0) {
dev_err(dev->class_dev,
"Communication to USBDUXSIGMA failed! Check firmware and cabling\n");
"Communication to USBDUXSIGMA failed! Check firmware and cabling.\n");
return offset;
}
dev_info(dev->class_dev, "attached, ADC_zero = %x\n", offset);