[PATCH v5 10/23] dmaengine: ste_dma40: Fix probe IRQ leak

[Linus Walleij <linusw@kernel.org>]

d40_probe() registers the hardware interrupt before several later probe
steps that can fail. Those error paths jump to destroy_cache without
freeing the IRQ, leaving the handler registered after probe resources have
been released.

Track successful IRQ registration and free the IRQ on later probe failure.

Fixes: 8d318a50b3d7 ("DMAENGINE: Support for ST-Ericssons DMA40 block v3")
Reported-by: sashiko-bot@kernel.org
Closes: https://lore.kernel.org/dmaengine/20260618051539.15E201F000E9@smtp.kernel.org/
Assisted-by: LLM
Signed-off-by: Linus Walleij <linusw@kernel.org>
---
 drivers/dma/ste_dma40.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index d67126e9c2bf..0782becdab11 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -3724,6 +3724,7 @@ static int __init d40_probe(struct platform_device *pdev)
 	struct resource res_lcpa;
 	int num_reserved_chans;
 	bool runtime_pm_enabled = false;
+	bool irq_requested = false;
 	u32 val;
 	int ret;
 
@@ -3847,6 +3848,7 @@ static int __init d40_probe(struct platform_device *pdev)
 		d40_err(dev, "No IRQ defined\n");
 		goto destroy_cache;
 	}
+	irq_requested = true;
 
 	dma_set_max_seg_size(base->dev, STEDMA40_MAX_SEG_SIZE);
 
@@ -3883,6 +3885,8 @@ static int __init d40_probe(struct platform_device *pdev)
 		regulator_disable(base->lcpa_regulator);
 		regulator_put(base->lcpa_regulator);
 	}
+	if (irq_requested)
+		free_irq(base->irq, base);
 	if (runtime_pm_enabled)
 		pm_runtime_disable(base->dev);
 

-- 
2.55.0