linux-kernel - RE: [PATCH 0/6] staging: comedi: fix some minor issues with file poll op

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Message-ID: <BN3PR0101MB10575013B005DE1B802EDF6DD0340@BN3PR0101MB1057.prod.exchangelabs.com>
Date:	Fri, 9 Oct 2015 17:27:33 +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>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 0/6] staging: comedi: fix some minor issues with file poll
 op

On Friday, October 09, 2015 4:27 AM, Ian Abbott wrote:
> A few changes for the "poll" file operation to avoid poll-waiting on the
> same subdevice for both read and write (patch 1), avoid allocating write
> buffer space unnecessarily and possibly inappropriately (patch 4),
> consider whether any active commands belong to the current file object
> (patch 5), and avoid using the main mutex (for performance reasons)
> (patch 6).
>
> 1) staging: comedi: don't poll_wait on same subdevice twice
> 2) staging: comedi: rename comedi_buf_write_n_available
> 3) staging: comedi: add new comedi_buf_write_n_available()
> 4) staging: comedi: don't allocate buffer space when polling for write
> 5) staging: comedi: check command started by file being polled
> 6) staging: comedi: don't use mutex when polling file
>
>  drivers/staging/comedi/comedi_buf.c      | 19 +++++++++++++------
>  drivers/staging/comedi/comedi_fops.c     | 17 +++++++++--------
>  drivers/staging/comedi/comedi_internal.h |  1 +
>  3 files changed, 23 insertions(+), 14 deletions(-)

Thanks!

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

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