mmc: atmel-mci: don't use dma features when using DMA with no chan available

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@atmel.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
[Should be applied to 3.2-stable.]
Cc: <stable@vger.kernel.org>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 10 insertions, 11 deletions

diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 6985cdb0bb26..e4449a54ae8f 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -1948,12 +1948,12 @@ static bool atmci_filter(struct dma_chan *chan, void *slave)
         }
 }
 
-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;
 
@@ -1970,12 +1970,15 @@ static void atmci_configure_dma(struct atmel_mci *host)
                 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)
@@ -2085,8 +2088,7 @@ static int __init atmci_probe(struct platform_device *pdev)
 
         /* 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;
@@ -2096,15 +2098,12 @@ static int __init atmci_probe(struct platform_device *pdev)
                 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 */