ARM/dmaengine: edma: Move of_dma_controller_register to the dmaengine driver
If the of_dma_controller is registered in the non dmaengine driver we could
have race condition:
the of_dma_controller has been registered, but the dmaengine driver is not
yet probed. Drivers requesting DMA channels during this window will fail
since we do not yet have dmaengine drivers registered.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index 19fa49d..fcb4680 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -25,6 +25,7 @@
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/of.h>
+#include <linux/of_dma.h>
#include <linux/platform_data/edma.h>
@@ -987,9 +988,14 @@
INIT_LIST_HEAD(&dma->channels);
}
+static struct of_dma_filter_info edma_filter_info = {
+ .filter_fn = edma_filter_fn,
+};
+
static int edma_probe(struct platform_device *pdev)
{
struct edma_cc *ecc;
+ struct device_node *parent_node = pdev->dev.parent->of_node;
int ret;
ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
@@ -1024,6 +1030,13 @@
platform_set_drvdata(pdev, ecc);
+ if (parent_node) {
+ dma_cap_set(DMA_SLAVE, edma_filter_info.dma_cap);
+ dma_cap_set(DMA_CYCLIC, edma_filter_info.dma_cap);
+ of_dma_controller_register(parent_node, of_dma_simple_xlate,
+ &edma_filter_info);
+ }
+
dev_info(&pdev->dev, "TI EDMA DMA engine driver\n");
return 0;
@@ -1037,7 +1050,10 @@
{
struct device *dev = &pdev->dev;
struct edma_cc *ecc = dev_get_drvdata(dev);
+ struct device_node *parent_node = pdev->dev.parent->of_node;
+ if (parent_node)
+ of_dma_controller_free(parent_node);
dma_async_device_unregister(&ecc->dma_slave);
edma_free_slot(ecc->dummy_slot);