@@ -554,27 +554,6 @@ static int usbduxsigma_ai_cmdtest(struct comedi_device *dev,
if (err)
return 3;
- /* Step 4: fix up any arguments */
-
- if (high_speed) {
- /*
- * every 2 channels get a time window of 125us. Thus, if we
- * sample all 16 channels we need 1ms. If we sample only one
- * channel we need only 125us
- */
- devpriv->ai_interval = interval;
- devpriv->ai_timer = cmd->scan_begin_arg / (125000 * interval);
- } else {
- /* interval always 1ms */
- devpriv->ai_interval = 1;
- devpriv->ai_timer = cmd->scan_begin_arg / 1000000;
- }
- if (devpriv->ai_timer < 1)
- err |= -EINVAL;
-
- if (err)
- return 4;
-
return 0;
}
@@ -672,6 +651,22 @@ static int usbduxsigma_ai_cmd(struct comedi_device *dev,
down(&devpriv->sem);
+ if (devpriv->high_speed) {
+ /*
+ * every 2 channels get a time window of 125us. Thus, if we
+ * sample all 16 channels we need 1ms. If we sample only one
+ * channel we need only 125us
+ */
+ unsigned int interval = usbduxsigma_chans_to_interval(len);
+
+ devpriv->ai_interval = interval;
+ devpriv->ai_timer = cmd->scan_begin_arg / (125000 * interval);
+ } else {
+ /* interval always 1ms */
+ devpriv->ai_interval = 1;
+ devpriv->ai_timer = cmd->scan_begin_arg / 1000000;
+ }
+
for (i = 0; i < len; i++) {
unsigned int chan = CR_CHAN(cmd->chanlist[i]);
This is a note to let you know that I have just added a patch titled staging: comedi: usbduxsigma: don't clobber ai_timer in command test to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree which can be found at: http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue This patch is scheduled to be released in version 3.19.8-ckt8. If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.19.y-ckt tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Kamal ------ From 4d3d2e1975776362ce71e3bca26a87d82b98f1a1 Mon Sep 17 00:00:00 2001 From: Ian Abbott <abbotti@mev.co.uk> Date: Thu, 23 Jul 2015 16:46:57 +0100 Subject: staging: comedi: usbduxsigma: don't clobber ai_timer in command test commit 423b24c37dd5794a674c74b0ed56392003a69891 upstream. `devpriv->ai_timer` is used while an asynchronous command is running on the AI subdevice. It also gets modified by the subdevice's `cmdtest` handler for checking new asynchronous commands (`usbduxsigma_ai_cmdtest()`), which is not correct as it's allowed to check new commands while an old command is still running. Fix it by moving the code which sets up `devpriv->ai_timer` and `devpriv->ai_interval` into the subdevice's `cmd` handler, `usbduxsigma_ai_cmd()`. Note that the removed code in `usbduxsigma_ai_cmdtest()` checked that `devpriv->ai_timer` did not end up less than than 1, but that could not happen because `cmd->scan_begin_arg` had already been checked to be at least the minimum required value (at least when `cmd->scan_begin_src == TRIG_TIMER`, which had also been checked to be the case). Fixes: b986be8527c7 ("staging: comedi: usbduxsigma: tidy up analog input command support) Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Reviewed-by: Bernd Porr <mail@berndporr.me.uk> Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- drivers/staging/comedi/drivers/usbduxsigma.c | 37 ++++++++++++---------------- 1 file changed, 16 insertions(+), 21 deletions(-) -- 1.9.1