linux-kernel - RE: [PATCH v4] Staging: comedi: convert while loop to timeout in ni_mio

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Date:	Wed, 15 Jan 2014 18:29:21 +0000
From:	Hartley Sweeten <HartleyS@...ionengravers.com>
To:	Greg KH <gregkh@...uxfoundation.org>,
	Chase Southwood <chase.southwood@...oo.com>
CC:	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"abbotti@....co.uk" <abbotti@....co.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v4] Staging: comedi: convert while loop to timeout in
 ni_mio_common.c

On Tuesday, January 14, 2014 8:59 PM, Greg KH wrote:
> Sleep for at least 10, as I think that's the smallest time delay you can
> sleep for anyway (meaning it will be that long no matter what number you
> put there less than 10, depending on the hardware used of course.)

A bit off topic here but I have a somewhat related question about timeouts.

There are a number of comedi drivers that do a "wait for end-of-conversion"
as part of the (*insn_read) for an analog input subdevice or (*insn_write) for
an analog output subdevice. These functions return an errno if a timeout occurs.

Currently either -ETIME or -ETIMEDOUT is returned. This errno ends up getting
returned to the user as the result of the unlocked_ioctl file operation. What is
the more appropriate errno? Or is there is better one that should be used?

Regards,
Hartley
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