linux-kernel - [ 27/95] mmc: atmel-mci: dont use dma features when using DMA with no chan available

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Message-Id: <20120309190204.521164189@linuxfoundation.org>
Date:	Fri, 09 Mar 2012 11:02:29 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Chris Ball <cjb@...top.org>
Subject: [ 27/95] mmc: atmel-mci: dont use dma features when using DMA with no chan available

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

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

From: Ludovic Desroches <ludovic.desroches@...el.com>

commit ef8781989a1bcd05aa47e853917c37df44917194 upstream.

Some callbacks are set too early -- i.e. we can have dma capabilities but
we can't get a dma channel. So wait to get the dma channel before setting
callbacks and change logs consequently.

Signed-off-by: Ludovic Desroches <ludovic.desroches@...el.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
Signed-off-by: Chris Ball <cjb@...top.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mmc/host/atmel-mci.c |   21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -1944,12 +1944,12 @@ static bool atmci_filter(struct dma_chan
 	}
 }
 
-static void atmci_configure_dma(struct atmel_mci *host)
+static bool atmci_configure_dma(struct atmel_mci *host)
 {
 	struct mci_platform_data	*pdata;
 
 	if (host == NULL)
-		return;
+		return false;
 
 	pdata = host->pdev->dev.platform_data;
 
@@ -1966,12 +1966,15 @@ static void atmci_configure_dma(struct a
 		host->dma.chan =
 			dma_request_channel(mask, atmci_filter, pdata->dma_slave);
 	}
-	if (!host->dma.chan)
-		dev_notice(&host->pdev->dev, "DMA not available, using PIO\n");
-	else
+	if (!host->dma.chan) {
+		dev_warn(&host->pdev->dev, "no DMA channel available\n");
+		return false;
+	} else {
 		dev_info(&host->pdev->dev,
 					"Using %s for DMA transfers\n",
 					dma_chan_name(host->dma.chan));
+		return true;
+	}
 }
 
 static inline unsigned int atmci_get_version(struct atmel_mci *host)
@@ -2081,8 +2084,7 @@ static int __init atmci_probe(struct pla
 
 	/* Get MCI capabilities and set operations according to it */
 	atmci_get_cap(host);
-	if (host->caps.has_dma) {
-		dev_info(&pdev->dev, "using DMA\n");
+	if (host->caps.has_dma && atmci_configure_dma(host)) {
 		host->prepare_data = &atmci_prepare_data_dma;
 		host->submit_data = &atmci_submit_data_dma;
 		host->stop_transfer = &atmci_stop_transfer_dma;
@@ -2092,15 +2094,12 @@ static int __init atmci_probe(struct pla
 		host->submit_data = &atmci_submit_data_pdc;
 		host->stop_transfer = &atmci_stop_transfer_pdc;
 	} else {
-		dev_info(&pdev->dev, "no DMA, no PDC\n");
+		dev_info(&pdev->dev, "using PIO\n");
 		host->prepare_data = &atmci_prepare_data;
 		host->submit_data = &atmci_submit_data;
 		host->stop_transfer = &atmci_stop_transfer;
 	}
 
-	if (host->caps.has_dma)
-		atmci_configure_dma(host);
-
 	platform_set_drvdata(pdev, host);
 
 	/* We need at least one slot to succeed */


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