[PATCH] dmaengine: qcom-bam-dma: fix autosuspend cleanup during removal

[Guangshuo Li]

bam_dma_probe() calls pm_runtime_use_autosuspend(), but
bam_dma_remove() does not call the matching
pm_runtime_dont_use_autosuspend() when removing the device.

If the autosuspend delay is set to a negative value while autosuspend
is enabled, the runtime PM core increments usage_count to prevent
runtime suspend. Without calling pm_runtime_dont_use_autosuspend()
during teardown, this reference is not dropped and usage_count remains
unbalanced.

Add the missing pm_runtime_dont_use_autosuspend() call before forcing
the device into runtime suspend during removal.

This issue was found by manual code inspection.

Fixes: 7d2545599f5b ("dmaengine: qcom-bam-dma: Add pm_runtime support")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Guangshuo Li <lgs201920130244@xxxxxxxxx>
---
 drivers/dma/qcom/bam_dma.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c
index 1bb26af0405f..05a3b1f9e0c2 100644
--- a/drivers/dma/qcom/bam_dma.c
+++ b/drivers/dma/qcom/bam_dma.c
@@ -1401,6 +1401,7 @@ static void bam_dma_remove(struct platform_device *pdev)
 	struct bam_device *bdev = platform_get_drvdata(pdev);
 	u32 i;
 
+	pm_runtime_dont_use_autosuspend(&pdev->dev);
 	pm_runtime_force_suspend(&pdev->dev);
 
 	of_dma_controller_free(pdev->dev.of_node);
-- 
2.43.0