This is a note to let you know that I've just added the patch titled
staging: comedi: usbduxfast: usbduxfast_ai_cmdtest rounding error
to my staging git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
in the staging-testing branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will be merged to the staging-next branch sometime soon,
after it passes testing, and the merge window is open.
If you have any questions about this process, please let me know.
>From c83b03628f0a1c0e652c9424fed2e903cca1c3b7 Mon Sep 17 00:00:00 2001
From: Bernd Porr <mail@xxxxxxxxxxxxxxx>
Date: Mon, 18 Nov 2019 23:07:59 +0000
Subject: staging: comedi: usbduxfast: usbduxfast_ai_cmdtest rounding error
The userspace comedilib function 'get_cmd_generic_timed' fills
the cmd structure with an informed guess and then calls the
function 'usbduxfast_ai_cmdtest' in this driver 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 addition
the case of steps being 0 wasn't checked which is also now done.
Signed-off-by: Bernd Porr <mail@xxxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # 4.4+
Reviewed-by: Ian Abbott <abbotti@xxxxxxxxx>
Link: https://lore.kernel.org/r/20191118230759.1727-1-mail@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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);
--
2.24.0
