linux-kernel - [25/45] mmc: mxcmmc: fix falling back to PIO

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Message-Id: <20111216194210.870950422@clark.kroah.org>
Date:	Fri, 16 Dec 2011 11:40:32 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Sascha Hauer <s.hauer@...gutronix.de>,
	Chris Ball <cjb@...top.org>
Subject: [25/45] mmc: mxcmmc: fix falling back to PIO

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sascha Hauer <s.hauer@...gutronix.de>

commit e58f516ff4730c4047c3f104b061f7a03e9a263c upstream.

When we can't configure the dma channel we want to fall
back to PIO. We do this by setting host->do_dma to zero.
This does not work as do_dma is used to see whether dma
can be used for the current transfer. Instead, we have
to set host->dma to NULL.

Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
Signed-off-by: Chris Ball <cjb@...top.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/mmc/host/mxcmmc.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/mmc/host/mxcmmc.c
+++ b/drivers/mmc/host/mxcmmc.c
@@ -731,6 +731,7 @@ static void mxcmci_set_ios(struct mmc_ho
 				"failed to config DMA channel. Falling back to PIO\n");
 			dma_release_channel(host->dma);
 			host->do_dma = 0;
+			host->dma = NULL;
 		}
 	}
 


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