linux-kernel - Re: [PATCH 1/1] MMC: core/core.c: mmc_rescan detects card change in one run

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Message-ID: <20090410183955.011c4d65@mjolnir.ossman.eu>
Date:	Fri, 10 Apr 2009 18:39:55 +0200
From:	Pierre Ossman <drzeus-mmc@...eus.cx>
To:	Jorg Schummer <ext-jorg.2.schummer@...ia.com>
Cc:	linux-kernel@...r.kernel.org,
	Jorg Schummer <ext-jorg.2.schummer@...ia.com>
Subject: Re: [PATCH 1/1] MMC: core/core.c: mmc_rescan detects card change in
 one run

On Tue, 31 Mar 2009 17:51:21 +0300
Jorg Schummer <ext-jorg.2.schummer@...ia.com> wrote:

> With this patch, mmc_rescan can detect the removal of an mmc card and
> the insertion of (possibly another) card in the same run. This means
> that a card change can be detected without having to call
> mmc_detect_change multiple times.
> 
> This change generalises the core such that it can be easily used by
> hosts which provide a mechanism to detect only the presence of a card
> reader cover, which has to be taken off in order to insert a card. Other
> hosts ("card detect" or "MMC_CAP_NEEDS_POLL") each receive an event when
> a card is removed and when a card is inserted, so it is sufficient for
> them if mmc_rescan handles only one event at a time. "Cover detect"
> hosts, however, only receive events about the cover status. This means
> that between 2 subsequent events, both a card removal and a card
> insertion can occur. In this case, the pre-patch version of mmc_rescan
> would only detect the removal of the previous card but not the insertion
> of the new card.
> 
> Signed-off-by: Jorg Schummer <ext-jorg.2.schummer@...ia.com>
> ---

Queued, thanks.

Rgds
-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  rdesktop, core developer          http://www.rdesktop.org
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