From e1631f989e0c6c8d9b43a2dbdd1097f70da603a5 Mon Sep 17 00:00:00 2001
From: Jaehoon Chung <jh80.chung@samsung.com>
Date: Wed, 18 Apr 2012 15:42:31 +0900
Subject: [PATCH] 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>
---
drivers/mmc/host/dw_mmc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index f3b0fcd002df8..ab3fc46171079 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__);
--
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