dmaengine: fsl-edma: fix dmamux index calculating error

Signed-off-by: Jingchang Lu <jingchang.lu@freescale.com>
Tested-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/dma/fsl-edma.c b/drivers/dma/fsl-edma.c
index b396a7fb53ab..24ab3d371954 100644
--- a/drivers/dma/fsl-edma.c
+++ b/drivers/dma/fsl-edma.c
@@ -248,11 +248,12 @@ static void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
                         unsigned int slot, bool enable)
 {
         u32 ch = fsl_chan->vchan.chan.chan_id;
-        void __iomem *muxaddr = fsl_chan->edma->muxbase[ch / DMAMUX_NR];
+        void __iomem *muxaddr;
         unsigned chans_per_mux, ch_off;
 
         chans_per_mux = fsl_chan->edma->n_chans / DMAMUX_NR;
         ch_off = fsl_chan->vchan.chan.chan_id % chans_per_mux;
+        muxaddr = fsl_chan->edma->muxbase[ch / chans_per_mux];
 
         if (enable)
                 edma_writeb(fsl_chan->edma,
@@ -724,6 +725,7 @@ static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
 {
         struct fsl_edma_engine *fsl_edma = ofdma->of_dma_data;
         struct dma_chan *chan, *_chan;
+        unsigned long chans_per_mux = fsl_edma->n_chans / DMAMUX_NR;
 
         if (dma_spec->args_count != 2)
                 return NULL;
@@ -732,7 +734,7 @@ static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
         list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels, device_node) {
                 if (chan->client_count)
                         continue;
-                if ((chan->chan_id / DMAMUX_NR) == dma_spec->args[0]) {
+                if ((chan->chan_id / chans_per_mux) == dma_spec->args[0]) {
                         chan = dma_get_slave_channel(chan);
                         if (chan) {
                                 chan->device->privatecnt++;