linux-kernel - [PATCH] [MMC] mvsdio: fix handling of partial word at the end of PIO transfer

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Date:	Sat, 18 Jul 2009 20:34:37 -0400 (EDT)
From:	Nicolas Pitre <nico@....org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH] [MMC] mvsdio: fix handling of partial word at the end of PIO
 transfer

Standard data flow for MMC/SD/SDIO cards requires that the mvsdio
controller be set for big endian operation.  This is causing problems
with buffers which length is not a multiple of 4 bytes as the last
partial word doesn't get shifted all the way and stored properly in
memory.  Let's compensate for this.

Signed-off-by: Nicolas Pitre <nico@...vell.com>
CC: stable@...nel.org
---

Since Pierre is (quite unfortunately) stepping down from MMC 
maintenance, I'm resending this to you in the hope this will reach 
mainline in a timely manner.  Some SDIO devices are broken without this.

diff --git a/drivers/mmc/host/mvsdio.c b/drivers/mmc/host/mvsdio.c
index b56d72f..34e2348 100644
--- a/drivers/mmc/host/mvsdio.c
+++ b/drivers/mmc/host/mvsdio.c
@@ -384,7 +384,7 @@ static irqreturn_t mvsd_irq(int irq, void *dev)
 				u16 val[2] = {0, 0};
 				val[0] = mvsd_read(MVSD_FIFO);
 				val[1] = mvsd_read(MVSD_FIFO);
-				memcpy(p, &val, s);
+				memcpy(p, ((void *)&val) + 4 - s, s);
 				s = 0;
 				intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
 			}
@@ -423,7 +423,7 @@ static irqreturn_t mvsd_irq(int irq, void *dev)
 		if (s < 4) {
 			if (s && (intr_status & MVSD_NOR_TX_AVAIL)) {
 				u16 val[2] = {0, 0};
-				memcpy(&val, p, s);
+				memcpy(((void *)&val) + 4 - s, p, s);
 				mvsd_write(MVSD_FIFO, val[0]);
 				mvsd_write(MVSD_FIFO, val[1]);
 				s = 0;
--
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