[PATCH] dmaengine: pl330: fix autosuspend cleanup during removal

[Guangshuo Li]

pl330_probe() calls pm_runtime_use_autosuspend(), but pl330_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 restoring
the runtime PM usage reference in the remove path.

This issue was found by manual code inspection.

Fixes: ae43b3289186 ("ARM: 8202/1: dmaengine: pl330: Add runtime Power Management support v12")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Guangshuo Li <lgs201920130244@xxxxxxxxx>
---
 drivers/dma/pl330.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 25ba84b18704..8baadd104719 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -3204,6 +3204,7 @@ static void pl330_remove(struct amba_device *adev)
 	struct dma_pl330_chan *pch, *_p;
 	int i, irq;
 
+	pm_runtime_dont_use_autosuspend(&adev->dev);
 	pm_runtime_get_noresume(pl330->ddma.dev);
 
 	if (adev->dev.of_node)
-- 
2.43.0