linux-kernel - [PATCH] tmio_mmc: Make ack_mmc

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Message-id: <4C455597.2020200@renesas.com>
Date:	Tue, 20 Jul 2010 16:51:51 +0900
From:	Yusuke Goda <yusuke.goda.sx@...esas.com>
To:	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
Cc:	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] tmio_mmc: Make ack_mmc_irqs() write-only

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>
---
 drivers/mmc/host/tmio_mmc.h |    5 +----
 1 files changed, 1 insertions(+), 4 deletions(-)

diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
index 64f7d5d..7944604 100644
--- a/drivers/mmc/host/tmio_mmc.h
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -82,10 +82,7 @@

 #define ack_mmc_irqs(host, i) \
 	do { \
-		u32 mask;\
-		mask  = sd_ctrl_read32((host), CTL_STATUS); \
-		mask &= ~((i) & TMIO_MASK_IRQ); \
-		sd_ctrl_write32((host), CTL_STATUS, mask); \
+		sd_ctrl_write32((host), CTL_STATUS, ~(i)); \
 	} while (0)


-- 
1.7.0



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