linux-kernel - RE: [PATCH 0/6] staging: comedi: usbduxsigma: fix some problems in command handling

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Date:	Fri, 24 Jul 2015 17:02:44 +0000
From:	Hartley Sweeten <HartleyS@...ionengravers.com>
To:	Ian Abbott <abbotti@....co.uk>,
	"driverdev-devel@...uxdriverproject.org" 
	<driverdev-devel@...uxdriverproject.org>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Bernd Porr <mail@...ndporr.me.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 0/6] staging: comedi: usbduxsigma: fix some problems in
 command handling

On Thursday, July 23, 2015 8:47 AM, Ian Abbott wrote:
>
> Fix some minor problems in the testing of asynchronous commands for the AI
> and AO subdevices and remove some redundant code.
>
> The main problem is that the testing of a new command can affect the
> operation of an already running command, which it isn't supposed to do.  (In
> practice, applications don't tend to test new commands while a command is
> running on the same subdevice, so the bug can be classed as minor.)  This is
> corrected by the patches 1 and 2, for the AI and AO subdevices,
> respectively.
>
> 1) staging: comedi: usbduxsigma: don't clobber ai_timer in command test
> 2) staging: comedi: usbduxsigma: don't clobber ao_timer in command test
> 3) staging: comedi: usbduxsigma: remove AI scan_begin_src == TRIG_FOLLOW
> 4) staging: comedi: usbduxsigma: round down AI scan_begin_arg at step 4.
> 5) staging: comedi: usbduxsigma: remove unused "convert" timing for AO
> 6) staging: comedi: usbduxsigma: round down AO scan_begin_arg at step 4.
>
>  drivers/staging/comedi/drivers/usbduxsigma.c | 139 +++++++++++----------------
>  1 file changed, 54 insertions(+), 85 deletions(-)

Reviewed-by: H Hartley Sweeten <hsweeten@...ionengravers.com>

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