From f17e53388e82ebefc78ff53e33a6d8eebc1ad337 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Wed, 8 Dec 2021 12:42:12 +0100 Subject: [PATCH] dmaengine: xilinx: Handle IRQ mapping errors Handle errors when trying to map the IRQ for the DMA channels. The main motivation here is to be able to handle probe deferral. E.g. when using DT overlays it is possible that the DMA controller is probed before interrupt controller, depending on the order in the DT. In order to support this switch from irq_of_parse_and_map() to of_irq_get(), which internally does the same, but it will return EPROBE_DEFER when the interrupt controller is not yet available. As a result other errors, such as an invalid IRQ specification, or missing IRQ are also properly handled. Signed-off-by: Lars-Peter Clausen Reviewed-by: Radhey Shyam Pandey Link: https://lore.kernel.org/r/20211208114212.234130-1-lars@metafoo.de Signed-off-by: Vinod Koul --- drivers/dma/xilinx/xilinx_dma.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c index 6161814..cd62bbb 100644 --- a/drivers/dma/xilinx/xilinx_dma.c +++ b/drivers/dma/xilinx/xilinx_dma.c @@ -2980,7 +2980,9 @@ static int xilinx_dma_chan_probe(struct xilinx_dma_device *xdev, } /* Request the interrupt */ - chan->irq = irq_of_parse_and_map(node, chan->tdest); + chan->irq = of_irq_get(node, chan->tdest); + if (chan->irq < 0) + return dev_err_probe(xdev->dev, chan->irq, "failed to get irq\n"); err = request_irq(chan->irq, xdev->dma_config->irq_handler, IRQF_SHARED, "xilinx-dma-controller", chan); if (err) { @@ -3054,8 +3056,11 @@ static int xilinx_dma_child_probe(struct xilinx_dma_device *xdev, if (xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA && ret < 0) dev_warn(xdev->dev, "missing dma-channels property\n"); - for (i = 0; i < nr_channels; i++) - xilinx_dma_chan_probe(xdev, node); + for (i = 0; i < nr_channels; i++) { + ret = xilinx_dma_chan_probe(xdev, node); + if (ret) + return ret; + } return 0; } -- 2.7.4