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

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Date:	Thu, 23 Jul 2015 16:46:56 +0100
From:	Ian Abbott <abbotti@....co.uk>
To:	<driverdev-devel@...uxdriverproject.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ian Abbott <abbotti@....co.uk>,
	H Hartley Sweeten <hsweeten@...ionengravers.com>,
	Bernd Porr <mail@...ndporr.me.uk>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH 0/6] staging: comedi: usbduxsigma: fix some problems in command handling

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(-)
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