From ed2c2e060b6c3cd5fc42993011aa41c765ff1b2f Mon Sep 17 00:00:00 2001 From: Ian Abbott Date: Thu, 23 Jul 2015 16:47:02 +0100 Subject: [PATCH] staging: comedi: usbduxsigma: round down AO scan_begin_arg at step 4. The return value of the `cmdtest` handler for a subdevice checks the prospective new command in various steps and returns the step number at which any problem was detected, or 0 if no problem was detected. It is allowed to modify the command in various ways at each step. Corrections for out-of-range values are generally made at step 3, and minor adjustments such as rounding are generally made at step 4. The `cmdtest` handler for the AO subdevice (`usbduxsigma_ao_cmdtest()`) currently range checks the timings at step 3. Since the running command will round down the timings, add code to round them down at step 4. Signed-off-by: Ian Abbott Reviewed-by: Bernd Porr Reviewed-by: H Hartley Sweeten Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/usbduxsigma.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/staging/comedi/drivers/usbduxsigma.c b/drivers/staging/comedi/drivers/usbduxsigma.c index 9f43e01b58c5..649cf47184a4 100644 --- a/drivers/staging/comedi/drivers/usbduxsigma.c +++ b/drivers/staging/comedi/drivers/usbduxsigma.c @@ -839,6 +839,7 @@ static int usbduxsigma_ao_cmdtest(struct comedi_device *dev, struct comedi_cmd *cmd) { struct usbduxsigma_private *devpriv = dev->private; + unsigned int tmp; int err = 0; /* Step 1 : check if triggers are trivially valid */ @@ -890,6 +891,14 @@ static int usbduxsigma_ao_cmdtest(struct comedi_device *dev, if (err) return 3; + /* Step 4: fix up any arguments */ + + tmp = rounddown(cmd->scan_begin_arg, 1000000); + err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, tmp); + + if (err) + return 4; + return 0; } -- 2.45.2