mmc: dw_mmc: prevent NULL dereference for dma_ops

Now, dma_ops is assumed that use the IDMAC.  But if dma_ops is assigned
the pdata->dma_ops, we didn't ensure that callback function is defined.

If the callback isn't defined, then we should run in PIO mode.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index f3b0fcd002df..ab3fc4617107 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -1881,7 +1881,8 @@ static void dw_mci_init_dma(struct dw_mci *host)
         if (!host->dma_ops)
                 goto no_dma;
 
-        if (host->dma_ops->init) {
+        if (host->dma_ops->init && host->dma_ops->start &&
+            host->dma_ops->stop && host->dma_ops->cleanup) {
                 if (host->dma_ops->init(host)) {
                         dev_err(&host->dev, "%s: Unable to initialize "
                                 "DMA Controller.\n", __func__);