On 18/11/2019 17:21, Bernd Porr wrote:
'get_cmd_generic_timed' fills the cmd structure with an informed
guess and then calls 'usbduxfast_ai_cmdtest' repeatedly while
'usbduxfast_ai_cmdtest' is modifying the cmd struct until it
no longer changes. However, because of rounding errors this never
converged because 'steps = (cmd->convert_arg * 30) / 1000' and then
back to 'cmd->convert_arg = (steps * 1000) / 30' won't be the same
because of rounding errors. 'Steps' should only be converted back to
the 'convert_arg' if 'steps' has actually been modified. In addion
the case of steps being 0 wasn't checked which is also now done.
Signed-off-by: Bernd Porr <mail@xxxxxxxxxxxxxxx>
The patch subject needs changing as it refers to usbduxsigma, and this
patch is for usbduxfast.
While we're at it, there is a typo in the patch description "addion" =>
"addition".
Also, make it clear that 'get_cmd_generic_timed' is the user-space
comedilib function 'comedi_get_cmd_generic_timed()'.
---
drivers/staging/comedi/drivers/usbduxfast.c | 21 ++++++++++++++-------
1 file changed, 14 insertions(+), 7 deletions(-)
diff --git a/drivers/staging/comedi/drivers/usbduxfast.c b/drivers/staging/comedi/drivers/usbduxfast.c
index 04bc488385e6..4af012968cb6 100644
--- a/drivers/staging/comedi/drivers/usbduxfast.c
+++ b/drivers/staging/comedi/drivers/usbduxfast.c
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0+
/*
- * Copyright (C) 2004-2014 Bernd Porr, mail@xxxxxxxxxxxxxxx
+ * Copyright (C) 2004-2019 Bernd Porr, mail@xxxxxxxxxxxxxxx
*/
/*
@@ -8,7 +8,7 @@
* Description: University of Stirling USB DAQ & INCITE Technology Limited
* Devices: [ITL] USB-DUX-FAST (usbduxfast)
* Author: Bernd Porr <mail@xxxxxxxxxxxxxxx>
- * Updated: 10 Oct 2014
+ * Updated: 16 Nov 2019
* Status: stable
*/
@@ -22,6 +22,7 @@
*
*
* Revision history:
+ * 1.0: Fixed a rounding error in usbduxfast_ai_cmdtest
* 0.9: Dropping the first data packet which seems to be from the last transfer.
* Buffer overflows in the FX2 are handed over to comedi.
* 0.92: Dropping now 4 packets. The quad buffer has to be emptied.
@@ -350,6 +351,7 @@ static int usbduxfast_ai_cmdtest(struct comedi_device *dev,
struct comedi_cmd *cmd)
{
int err = 0;
+ int err2 = 0;
unsigned int steps;
unsigned int arg;
@@ -399,11 +401,16 @@ static int usbduxfast_ai_cmdtest(struct comedi_device *dev,
*/
steps = (cmd->convert_arg * 30) / 1000;
if (cmd->chanlist_len != 1)
- err |= comedi_check_trigger_arg_min(&steps,
- MIN_SAMPLING_PERIOD);
- err |= comedi_check_trigger_arg_max(&steps, MAX_SAMPLING_PERIOD);
- arg = (steps * 1000) / 30;
- err |= comedi_check_trigger_arg_is(&cmd->convert_arg, arg);
+ err2 |= comedi_check_trigger_arg_min(&steps,
+ MIN_SAMPLING_PERIOD);
+ else
+ err2 |= comedi_check_trigger_arg_min(&steps, 1);
+ err2 |= comedi_check_trigger_arg_max(&steps, MAX_SAMPLING_PERIOD);
+ if (err2) {
+ err |= err2;
+ arg = (steps * 1000) / 30;
+ err |= comedi_check_trigger_arg_is(&cmd->convert_arg, arg);
+ }
if (cmd->stop_src == TRIG_COUNT)
err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1);
The actual patch looks good. A 'Cc:' line for "stable" kernel versions
4.4 and later could be added:
Cc: <stable@xxxxxxxxxxxxxxx> # 4.4+
Please mark the updated patch as '[PATCH v2]' in the subject. Thanks.
--
-=( Ian Abbott <abbotti@xxxxxxxxx> || Web: www.mev.co.uk )=-
-=( MEV Ltd. is a company registered in England & Wales. )=-
-=( Registered number: 02862268. Registered address: )=-
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