1. 24 Jul, 2015 3 commits
    • Ian Abbott's avatar
      staging: comedi: usbduxsigma: remove AI scan_begin_src == TRIG_FOLLOW · 12e1e696
      Ian Abbott authored
      The AI subdevice `cmdtest` handler `usbduxsigma_ai_cmdtest()` ensures
      that `cmd->scan_begin_src == TRIG_TIMER` by the end of step 2 of the
      command checking code, so assume that this is the case for step 3
      onwards and remove the redundant code.
      Signed-off-by: default avatarIan Abbott <abbotti@mev.co.uk>
      Reviewed-by: default avatarBernd Porr <mail@berndporr.me.uk>
      Reviewed-by: default avatarH Hartley Sweeten <hsweeten@visionengravers.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      12e1e696
    • Ian Abbott's avatar
      staging: comedi: usbduxsigma: don't clobber ao_timer in command test · c04a1f17
      Ian Abbott authored
      `devpriv->ao_timer` is used while an asynchronous command is running on
      the AO subdevice.  It also gets modified by the subdevice's `cmdtest`
      handler for checking new asynchronous commands,
      `usbduxsigma_ao_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->ao_timer` into the subdevice's
      `cmd` handler, `usbduxsigma_ao_cmd()`.
      
      Note that the removed code in `usbduxsigma_ao_cmdtest()` checked that
      `devpriv->ao_timer` did not end up less that 1, but that could not
      happen due because `cmd->scan_begin_arg` or `cmd->convert_arg` had
      already been range-checked.
      
      Also note that we tested the `high_speed` variable in the old code, but
      that is currently always 0 and means that we always use "scan" timing
      (`cmd->scan_begin_src == TRIG_TIMER` and `cmd->convert_src == TRIG_NOW`)
      and never "convert" (individual sample) timing (`cmd->scan_begin_src ==
      TRIG_FOLLOW` and `cmd->convert_src == TRIG_TIMER`).  The moved code
      tests `cmd->convert_src` instead to decide whether "scan" or "convert"
      timing is being used, although currently only "scan" timing is
      supported.
      
      Fixes: fb1ef622 ("staging: comedi: usbduxsigma: tidy up analog output command support")
      Signed-off-by: default avatarIan Abbott <abbotti@mev.co.uk>
      Reviewed-by: default avatarBernd Porr <mail@berndporr.me.uk>
      Reviewed-by: default avatarH Hartley Sweeten <hsweeten@visionengravers.com>
      Cc: <stable@vger.kernel.org> # 3.19 onwards
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      c04a1f17
    • Ian Abbott's avatar
      staging: comedi: usbduxsigma: don't clobber ai_timer in command test · 423b24c3
      Ian Abbott authored
      `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: b986be85 ("staging: comedi: usbduxsigma: tidy up analog input command support)
      Signed-off-by: default avatarIan Abbott <abbotti@mev.co.uk>
      Reviewed-by: default avatarBernd Porr <mail@berndporr.me.uk>
      Reviewed-by: default avatarH Hartley Sweeten <hsweeten@visionengravers.com>
      Cc: <stable@vger.kernel.org> # 3.19 onwards
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      423b24c3
  2. 23 Jul, 2015 37 commits