mmc: atmel-mci: Check pdata for NULL before dereferencing it at DMA config

Using an at91sam9g20ek development board with DTS configuration may trigger
a kernel panic because of a NULL pointer dereference exception, while
configuring DMA. Let's fix this by adding a check for pdata before
dereferencing it.

Signed-off-by: Brent Taylor <motobud@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 7f9d3de9f870..9268c41a8561 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -2438,7 +2438,7 @@ static int atmci_configure_dma(struct atmel_mci *host)
                 struct mci_platform_data *pdata = host->pdev->dev.platform_data;
                 dma_cap_mask_t mask;
 
-                if (!pdata->dma_filter)
+                if (!pdata || !pdata->dma_filter)
                         return -ENODEV;
 
                 dma_cap_zero(mask);