1 files changed, 36 insertions, 28 deletions

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 6abe1ec1f2ce..00eee59e8b33 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -82,7 +82,7 @@ struct dma_pl330_dmac {
         spinlock_t pool_lock;
 
         /* Peripheral channels connected to this DMAC */
-        struct dma_pl330_chan peripherals[0]; /* keep at end */
+        struct dma_pl330_chan *peripherals; /* keep at end */
 };
 
 struct dma_pl330_desc {
@@ -451,8 +451,13 @@ static struct dma_pl330_desc *pl330_get_desc(struct dma_pl330_chan *pch)
         desc->txd.cookie = 0;
         async_tx_ack(&desc->txd);
 
-        desc->req.rqtype = peri->rqtype;
-        desc->req.peri = peri->peri_id;
+        if (peri) {
+                desc->req.rqtype = peri->rqtype;
+                desc->req.peri = peri->peri_id;
+        } else {
+                desc->req.rqtype = MEMTOMEM;
+                desc->req.peri = 0;
+        }
 
         dma_async_tx_descriptor_init(&desc->txd, &pch->chan);
 
@@ -529,10 +534,10 @@ pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst,
         struct pl330_info *pi;
         int burst;
 
-        if (unlikely(!pch || !len || !peri))
+        if (unlikely(!pch || !len))
                 return NULL;
 
-        if (peri->rqtype != MEMTOMEM)
+        if (peri && peri->rqtype != MEMTOMEM)
                 return NULL;
 
         pi = &pch->dmac->pif;
@@ -577,7 +582,7 @@ pl330_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
         int i, burst_size;
         dma_addr_t addr;
 
-        if (unlikely(!pch || !sgl || !sg_len))
+        if (unlikely(!pch || !sgl || !sg_len || !peri))
                 return NULL;
 
         /* Make sure the direction is consistent */
@@ -666,17 +671,12 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
         struct dma_device *pd;
         struct resource *res;
         int i, ret, irq;
+        int num_chan;
 
         pdat = adev->dev.platform_data;
 
-        if (!pdat || !pdat->nr_valid_peri) {
-                dev_err(&adev->dev, "platform data missing\n");
-                return -ENODEV;
-        }
-
         /* Allocate a new DMAC and its Channels */
-        pdmac = kzalloc(pdat->nr_valid_peri * sizeof(*pch)
-                                + sizeof(*pdmac), GFP_KERNEL);
+        pdmac = kzalloc(sizeof(*pdmac), GFP_KERNEL);
         if (!pdmac) {
                 dev_err(&adev->dev, "unable to allocate mem\n");
                 return -ENOMEM;
@@ -685,7 +685,7 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
         pi = &pdmac->pif;
         pi->dev = &adev->dev;
         pi->pl330_data = NULL;
-        pi->mcbufsz = pdat->mcbuf_sz;
+        pi->mcbufsz = pdat ? pdat->mcbuf_sz : 0;
 
         res = &adev->res;
         request_mem_region(res->start, resource_size(res), "dma-pl330");
@@ -717,27 +717,35 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
         INIT_LIST_HEAD(&pd->channels);
 
         /* Initialize channel parameters */
-        for (i = 0; i < pdat->nr_valid_peri; i++) {
-                struct dma_pl330_peri *peri = &pdat->peri[i];
-                pch = &pdmac->peripherals[i];
+        num_chan = max(pdat ? pdat->nr_valid_peri : 0, (u8)pi->pcfg.num_chan);
+        pdmac->peripherals = kzalloc(num_chan * sizeof(*pch), GFP_KERNEL);
 
-                switch (peri->rqtype) {
-                case MEMTOMEM:
+        for (i = 0; i < num_chan; i++) {
+                pch = &pdmac->peripherals[i];
+                if (pdat) {
+                        struct dma_pl330_peri *peri = &pdat->peri[i];
+
+                        switch (peri->rqtype) {
+                        case MEMTOMEM:
+                                dma_cap_set(DMA_MEMCPY, pd->cap_mask);
+                                break;
+                        case MEMTODEV:
+                        case DEVTOMEM:
+                                dma_cap_set(DMA_SLAVE, pd->cap_mask);
+                                break;
+                        default:
+                                dev_err(&adev->dev, "DEVTODEV Not Supported\n");
+                                continue;
+                        }
+                        pch->chan.private = peri;
+                } else {
                         dma_cap_set(DMA_MEMCPY, pd->cap_mask);
-                        break;
-                case MEMTODEV:
-                case DEVTOMEM:
-                        dma_cap_set(DMA_SLAVE, pd->cap_mask);
-                        break;
-                default:
-                        dev_err(&adev->dev, "DEVTODEV Not Supported\n");
-                        continue;
+                        pch->chan.private = NULL;
                 }
 
                 INIT_LIST_HEAD(&pch->work_list);
                 spin_lock_init(&pch->lock);
                 pch->pl330_chid = NULL;
-                pch->chan.private = peri;
                 pch->chan.device = pd;
                 pch->chan.chan_id = i;
                 pch->dmac = pdmac;