ARM: S3C24XX: DMA: Use valid index when accessing array

The DMA_CH_VALID bit used in the channel index should be masked out before
using it to access the channel array.

Signed-off-by: Ramax Lo <ramaxlo@gmail.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/arch/arm/plat-s3c24xx/dma.c b/arch/arm/plat-s3c24xx/dma.c
index f65192d5b1d7..f0ea7943ac5a 100644
--- a/arch/arm/plat-s3c24xx/dma.c
+++ b/arch/arm/plat-s3c24xx/dma.c
@@ -1403,11 +1403,13 @@ static struct s3c2410_dma_chan *s3c2410_dma_map_channel(int channel)
                 ord = &dma_order->channels[channel];
 
                 for (ch = 0; ch < dma_channels; ch++) {
+                        int tmp;
                         if (!is_channel_valid(ord->list[ch]))
                                 continue;
 
-                        if (s3c2410_chans[ord->list[ch]].in_use == 0) {
-                                ch = ord->list[ch] & ~DMA_CH_VALID;
+                        tmp = ord->list[ch] & ~DMA_CH_VALID;
+                        if (s3c2410_chans[tmp].in_use == 0) {
+                                ch = tmp;
                                 goto found;
                         }
                 }