From a5f8e3471fc20567df888267885dec3eb340eb37 Mon Sep 17 00:00:00 2001 From: Runyu Xiao Date: Sun, 30 Aug 2026 13:33:08 +0800 Subject: [PATCH] dmaengine: altera-msgdma: initialize state before requesting IRQ msgdma_probe() registers the IRQ before initializing the tasklet, lock, and descriptor lists used by the interrupt handler. A pending interrupt can access incomplete state during probe. Initialize the handler state before requesting the IRQ so the interrupt path observes ready software state. Fixes: a85c6f1b2921 ("dmaengine: Add driver for Altera / Intel mSGDMA IP core") Cc: stable@vger.kernel.org Assisted-by: Codex:GPT-5 Signed-off-by: Runyu Xiao Acked-by: Adrian Ng Ho Yin Reviewed-by: Frank Li Link: https://patch.msgid.link/20260830053308.2190597-1-runyu.xiao@seu.edu.cn Signed-off-by: Vinod Koul --- drivers/dma/altera-msgdma.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/dma/altera-msgdma.c b/drivers/dma/altera-msgdma.c index e23e5b441a24..412f4bce1d4a 100644 --- a/drivers/dma/altera-msgdma.c +++ b/drivers/dma/altera-msgdma.c @@ -847,11 +847,6 @@ static int msgdma_probe(struct platform_device *pdev) if (mdev->irq < 0) return -ENXIO; - ret = devm_request_irq(&pdev->dev, mdev->irq, msgdma_irq_handler, - 0, dev_name(&pdev->dev), mdev); - if (ret) - return ret; - tasklet_setup(&mdev->irq_tasklet, msgdma_tasklet); dma_cookie_init(&mdev->dmachan); @@ -863,6 +858,11 @@ static int msgdma_probe(struct platform_device *pdev) INIT_LIST_HEAD(&mdev->done_list); INIT_LIST_HEAD(&mdev->free_list); + ret = devm_request_irq(&pdev->dev, mdev->irq, msgdma_irq_handler, + 0, dev_name(&pdev->dev), mdev); + if (ret) + return ret; + dma_dev = &mdev->dmadev; /* Set DMA capabilities */