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From: "Henrik Rydberg" <rydberg@euromail.se>
To: Daniel Kurtz <djkurtz@chromium.org>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>,
	Joonyoung Shim <jy0922.shim@samsung.com>,
	Nick Dyer <nick.dyer@itdev.co.uk>,
	linux-input@vger.kernel.org, linux-kernel@vger.kernel.org,
	Benson Leung <bleung@chromium.org>,
	Yufeng Shen <miletus@chromium.org>
Subject: Re: [PATCH 11/16 v2] Input: atmel_mxt_ts - refactor reading object table
Date: Fri, 13 Apr 2012 13:09:04 +0200	[thread overview]
Message-ID: <20120413110904.GA4842@polaris.bitmath.org> (raw)
In-Reply-To: <CAGS+omCMWqWsALjBd=r5HbKMQ+ZJKayuUEQuL7LXwkbr+xmy1g@mail.gmail.com>

> > I am talking about the data that is being read here and written in
> > mxt_check_reg_init(). By matching the struct with that data, all the
> > copies you make would go away.
> 
> The data read here is a table of object descriptors.  The data written
> in mxt_check_reg_init() is configuration data for each of the objects
> described by the descriptors.  What copies are you talking about?

In this patch, the object descriptors are read into a buffer, then
copied over to the object struct that you hold. That is the copy that
obviously goes away if the data is copied directly into the suggested
struct. In patch 9, you copy an unknown amount of data over to a
stack-allocated buffer before sending it via ic2. That is the main
technichal concern, and it was the first question you got, some days
ago.

> The config array in platform_data is a single big long array that has
> to be manually created in a platform file.  It just has blobs of data
> for each of the 'writable' objects for a given device, all
> concatenated together.

Ok, so no need for the second suggested struct or anything of that
kind. Just sort out the maximum blob size and, if necessary, avoid the
stack allocation in mxt_check_reg_init(), and it should be fine.

Henrik

  reply	other threads:[~2012-04-13 11:06 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-03-29 16:49 [PATCH 00/16 v2] cleanup atmel_mxt_ts Daniel Kurtz
2012-03-29 16:49 ` [PATCH 01/16 v2] Input: atmel_mxt_ts - use CONFIG_PM_SLEEP Daniel Kurtz
2012-03-29 16:49 ` [PATCH 02/16 v2] Input: atmel_mxt_ts - only allow root to update firmware Daniel Kurtz
2012-03-29 16:49 ` [PATCH 03/16 v2] Input: atmel_mxt_ts - refactor mxt_read/write_reg to take a length Daniel Kurtz
2012-04-11  9:05   ` Henrik Rydberg
2012-04-14  4:12     ` Daniel Kurtz
2012-03-29 16:49 ` [PATCH 04/16 v2] Input: atmel_mxt_ts - store actual size and instance Daniel Kurtz
2012-03-29 16:49 ` [PATCH 05/16 v2] Input: atmel_mxt_ts - verify object size in mxt_write_object Daniel Kurtz
2012-03-29 16:49 ` [PATCH 06/16 v2] Input: atmel_mxt_ts - do not read extra (checksum) byte Daniel Kurtz
2012-03-29 16:49 ` [PATCH 07/16 v2] Input: atmel_mxt_ts - dump each message on just 1 line Daniel Kurtz
2012-03-29 16:49 ` [PATCH 08/16 v2] Input: atmel_mxt_ts - refactor mxt_object_show Daniel Kurtz
2012-04-11 16:25   ` Henrik Rydberg
2012-03-29 16:49 ` [PATCH 09/16 v2] Input: atmel_mxt_ts - optimize writing of object table entries Daniel Kurtz
2012-04-13  9:13   ` Henrik Rydberg
2012-03-29 16:49 ` [PATCH 10/16 v2] Input: atmel_mxt_ts - refactor get info Daniel Kurtz
2012-03-29 16:49 ` [PATCH 11/16 v2] Input: atmel_mxt_ts - refactor reading object table Daniel Kurtz
2012-04-13  9:11   ` Henrik Rydberg
2012-04-13  9:21     ` Daniel Kurtz
2012-04-13  9:34       ` Henrik Rydberg
2012-04-13 10:10         ` Daniel Kurtz
2012-04-13 11:09           ` Henrik Rydberg [this message]
2012-03-29 16:49 ` [PATCH 12/16 v2] Input: atmel_mxt_ts - simplify event reporting Daniel Kurtz
2012-03-29 16:49 ` [PATCH 13/16 v2] Input: atmel_mxt_ts - cache T9 reportid range when reading object table Daniel Kurtz
2012-03-29 16:49 ` [PATCH 14/16 v2] Input: atmel_mxt_ts - parse vector field of data packets Daniel Kurtz
2012-03-29 16:49 ` [PATCH 15/16 v2] Input: atmel_mxt_ts - send all MT-B slots in one input report Daniel Kurtz
2012-04-13  9:20   ` Henrik Rydberg
2012-03-29 16:49 ` [PATCH 16/16 v2] Input: atmel_mxt_ts - parse T6 reports Daniel Kurtz
2012-04-09 13:14 ` [PATCH 00/16 v2] cleanup atmel_mxt_ts Daniel Kurtz

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