dmaengine: omap-dma: Dynamically allocate memory for lch_map

commit 2d1a9a946faebfedd660a1f1c2b90984fff41f91 upstream.

On OMAP1 platforms we do not have 32 channels available. Allocate the
lch_map based on the available channels. This way we are not going to have
more visible channels then it is available on the platform.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 14 insertions, 6 deletions

diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
index cd2bcc10f1e2..9baf8be12e77 100644
--- a/drivers/dma/omap-dma.c
+++ b/drivers/dma/omap-dma.c
@@ -35,7 +35,7 @@ struct omap_dmadev {
         unsigned dma_requests;
         spinlock_t irq_lock;
         uint32_t irq_enable_mask;
-        struct omap_chan *lch_map[OMAP_SDMA_CHANNELS];
+        struct omap_chan **lch_map;
 };
 
 struct omap_chan {
@@ -1223,16 +1223,24 @@ static int omap_dma_probe(struct platform_device *pdev)
         spin_lock_init(&od->lock);
         spin_lock_init(&od->irq_lock);
 
-        od->dma_requests = OMAP_SDMA_REQUESTS;
-        if (pdev->dev.of_node && of_property_read_u32(pdev->dev.of_node,
-                                                      "dma-requests",
-                                                      &od->dma_requests)) {
+        if (!pdev->dev.of_node) {
+                od->dma_requests = od->plat->dma_attr->lch_count;
+                if (unlikely(!od->dma_requests))
+                        od->dma_requests = OMAP_SDMA_REQUESTS;
+        } else if (of_property_read_u32(pdev->dev.of_node, "dma-requests",
+                                        &od->dma_requests)) {
                 dev_info(&pdev->dev,
                          "Missing dma-requests property, using %u.\n",
                          OMAP_SDMA_REQUESTS);
+                od->dma_requests = OMAP_SDMA_REQUESTS;
         }
 
-        for (i = 0; i < OMAP_SDMA_CHANNELS; i++) {
+        od->lch_map = devm_kcalloc(&pdev->dev, od->dma_requests,
+                                   sizeof(*od->lch_map), GFP_KERNEL);
+        if (!od->lch_map)
+                return -ENOMEM;
+
+        for (i = 0; i < od->dma_requests; i++) {
                 rc = omap_dma_chan_init(od);
                 if (rc) {
                         omap_dma_free(od);