linux-kernel - Re: [PATCH] tmio_mmc: Make ack_mmc

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Message-ID: <4C6E9B75.8030004@arndnet.de>
Date:	Fri, 20 Aug 2010 17:12:53 +0200
From:	Arnd Hannemann <arnd@...dnet.de>
To:	Yusuke Goda <yusuke.goda.sx@...esas.com>
CC:	ian@...menth.co.uk, damm@...nsource.se, sameo@...ux.intel.com,
	Paul Mundt <lethal@...ux-sh.org>, g.liakhovetski@....de,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] tmio_mmc: Make ack_mmc_irqs() write-only

Am 20.07.2010 09:51, schrieb Yusuke Goda:
> This patch updates ack_mmc_irqs() to acknowledge using write instead
> of read-modify-write. Without this fix the old read-modify-write
> implementation may acknowledge interrupt sources by mistake. The
> driver may if so lock-up waiting forever for an interrupt that will
> never come. Observed with the TMIO_STAT_RXRDY bit together with
> CMD53 on AR6002 and BCM4318 SDIO cards in polled mode.
>
> Signed-off-by: Yusuke Goda <yusuke.goda.sx@...esas.com>

Tested on AP4EVB (sh7372) with SDHC and MMC cards - no regression.

Tested-by: Arnd Hannemann <arnd@...dnet.de>
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