mtd: OneNAND: Fix loop hang when DMA error at Samsung SoCs

When DMA error occurs. it's loop hang since it can't exit the loop.
and it's the right DMA handling code as Spec.

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

diff --git a/drivers/mtd/onenand/samsung.c b/drivers/mtd/onenand/samsung.c
index 094dfcb..a460f1b 100644 (file)
--- a/drivers/mtd/onenand/samsung.c
+++ b/drivers/mtd/onenand/samsung.c
@@ -554,14 +554,13 @@ static int s5pc110_dma_ops(void *dst, void *src, size_t count, int direction)
 
        do {
                status = readl(base + S5PC110_DMA_TRANS_STATUS);
+               if (status & S5PC110_DMA_TRANS_STATUS_TE) {
+                       writel(S5PC110_DMA_TRANS_CMD_TEC,
+                                       base + S5PC110_DMA_TRANS_CMD);
+                       return -EIO;
+               }
        } while (!(status & S5PC110_DMA_TRANS_STATUS_TD));
 
-       if (status & S5PC110_DMA_TRANS_STATUS_TE) {
-               writel(S5PC110_DMA_TRANS_CMD_TEC, base + S5PC110_DMA_TRANS_CMD);
-               writel(S5PC110_DMA_TRANS_CMD_TDC, base + S5PC110_DMA_TRANS_CMD);
-               return -EIO;
-       }
-
        writel(S5PC110_DMA_TRANS_CMD_TDC, base + S5PC110_DMA_TRANS_CMD);
 
        return 0;