drivers/dma/dma-jz4780: Fix race condition between probe and irq handler
[ Upstream commit 6d6018fc30
]
In probe, IRQ is requested before zchan->id is initialized which can be
read in the irq handler. Hence, shift request irq after other initializations
complete.
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
Reviewed-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20200821034423.12713-1-madhuparnabhowmik10@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
parent
bcdbb7c8c7
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cb54984b79
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@ -885,24 +885,11 @@ static int jz4780_dma_probe(struct platform_device *pdev)
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return -EINVAL;
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}
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ret = platform_get_irq(pdev, 0);
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if (ret < 0)
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return ret;
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jzdma->irq = ret;
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ret = request_irq(jzdma->irq, jz4780_dma_irq_handler, 0, dev_name(dev),
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jzdma);
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if (ret) {
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dev_err(dev, "failed to request IRQ %u!\n", jzdma->irq);
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return ret;
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}
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jzdma->clk = devm_clk_get(dev, NULL);
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if (IS_ERR(jzdma->clk)) {
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dev_err(dev, "failed to get clock\n");
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ret = PTR_ERR(jzdma->clk);
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goto err_free_irq;
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return ret;
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}
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clk_prepare_enable(jzdma->clk);
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@ -955,10 +942,23 @@ static int jz4780_dma_probe(struct platform_device *pdev)
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jzchan->vchan.desc_free = jz4780_dma_desc_free;
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}
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ret = platform_get_irq(pdev, 0);
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if (ret < 0)
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goto err_disable_clk;
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jzdma->irq = ret;
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ret = request_irq(jzdma->irq, jz4780_dma_irq_handler, 0, dev_name(dev),
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jzdma);
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if (ret) {
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dev_err(dev, "failed to request IRQ %u!\n", jzdma->irq);
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goto err_disable_clk;
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}
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ret = dmaenginem_async_device_register(dd);
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if (ret) {
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dev_err(dev, "failed to register device\n");
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goto err_disable_clk;
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goto err_free_irq;
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}
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/* Register with OF DMA helpers. */
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@ -966,17 +966,17 @@ static int jz4780_dma_probe(struct platform_device *pdev)
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jzdma);
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if (ret) {
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dev_err(dev, "failed to register OF DMA controller\n");
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goto err_disable_clk;
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goto err_free_irq;
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}
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dev_info(dev, "JZ4780 DMA controller initialised\n");
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return 0;
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err_disable_clk:
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clk_disable_unprepare(jzdma->clk);
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err_free_irq:
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free_irq(jzdma->irq, jzdma);
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err_disable_clk:
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clk_disable_unprepare(jzdma->clk);
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return ret;
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}
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