1 files changed, 15 insertions, 2 deletions

diff --git a/drivers/dma/sh/shdma-base.c b/drivers/dma/sh/shdma-base.c
index 94b6bde6c86a..e427a03a0e8b 100644
--- a/drivers/dma/sh/shdma-base.c
+++ b/drivers/dma/sh/shdma-base.c
@@ -672,11 +672,12 @@ static struct dma_async_tx_descriptor *shdma_prep_dma_cyclic(
 {
         struct shdma_chan *schan = to_shdma_chan(chan);
         struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device);
+        struct dma_async_tx_descriptor *desc;
         const struct shdma_ops *ops = sdev->ops;
         unsigned int sg_len = buf_len / period_len;
         int slave_id = schan->slave_id;
         dma_addr_t slave_addr;
-        struct scatterlist sgl[SHDMA_MAX_SG_LEN];
+        struct scatterlist *sgl;
         int i;
 
         if (!chan)
@@ -700,7 +701,16 @@ static struct dma_async_tx_descriptor *shdma_prep_dma_cyclic(
 
         slave_addr = ops->slave_addr(schan);
 
+        /*
+         * Allocate the sg list dynamically as it would consumer too much stack
+         * space.
+         */
+        sgl = kcalloc(sg_len, sizeof(*sgl), GFP_KERNEL);
+        if (!sgl)
+                return NULL;
+
         sg_init_table(sgl, sg_len);
+
         for (i = 0; i < sg_len; i++) {
                 dma_addr_t src = buf_addr + (period_len * i);
 
@@ -710,8 +720,11 @@ static struct dma_async_tx_descriptor *shdma_prep_dma_cyclic(
                 sg_dma_len(&sgl[i]) = period_len;
         }
 
-        return shdma_prep_sg(schan, sgl, sg_len, &slave_addr,
+        desc = shdma_prep_sg(schan, sgl, sg_len, &slave_addr,
                              direction, flags, true);
+
+        kfree(sgl);
+        return desc;
 }
 
 static int shdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,