From aa6081e5e0989f4df9ca35fa412e3ba8c23e38df Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Wed, 24 Jul 2013 14:17:50 -0700 Subject: [PATCH] staging: comedi: usbdux: tidy up usbdux_ai_cancel() 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. Signed-off-by: H Hartley Sweeten Cc: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/usbdux.c | 22 +++++++--------------- 1 file changed, 7 insertions(+), 15 deletions(-) diff --git a/drivers/staging/comedi/drivers/usbdux.c b/drivers/staging/comedi/drivers/usbdux.c index c195ec6f8fb5..edee14851d70 100644 --- a/drivers/staging/comedi/drivers/usbdux.c +++ b/drivers/staging/comedi/drivers/usbdux.c @@ -283,27 +283,19 @@ static int usbdux_ai_stop(struct comedi_device *dev, int do_unlink) return ret; } -/* - * This will cancel a running acquisition operation. - * This is called by comedi but never from inside the driver. - */ static int usbdux_ai_cancel(struct comedi_device *dev, struct comedi_subdevice *s) { - struct usbdux_private *this_usbduxsub; - int res = 0; - - /* force unlink of all urbs */ - this_usbduxsub = dev->private; - if (!this_usbduxsub) - return -EFAULT; + struct usbdux_private *devpriv = dev->private; + int ret = 0; /* prevent other CPUs from submitting new commands just now */ - down(&this_usbduxsub->sem); + down(&devpriv->sem); /* unlink only if the urb really has been submitted */ - res = usbdux_ai_stop(dev, this_usbduxsub->ai_cmd_running); - up(&this_usbduxsub->sem); - return res; + ret = usbdux_ai_stop(dev, devpriv->ai_cmd_running); + up(&devpriv->sem); + + return ret; } /* analogue IN - interrupt service routine */ -- 2.20.1