[PATCH] bus: mhi: host: pci_generic: fix usage_count leak when autosuspend_delay is negative

mhi_pci_probe() calls pm_runtime_use_autosuspend() when runtime PM is
supported, but mhi_pci_remove() does not call the matching
pm_runtime_dont_use_autosuspend() during device removal.

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 driver teardown, this reference is not dropped and usage_count
remains unbalanced.

Add the missing pm_runtime_dont_use_autosuspend() call before
forbidding runtime PM.

This issue was found by manual code inspection.

Fixes: d3800c1dce24 ("bus: mhi: pci_generic: Add support for runtime PM")
Cc: [email protected]
Signed-off-by: Guangshuo Li <[email protected]>
---
 drivers/bus/mhi/host/pci_generic.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/bus/mhi/host/pci_generic.c b/drivers/bus/mhi/host/pci_generic.c
index 0d0d9c7ffa4b..8efff3e0a31c 100644
--- a/drivers/bus/mhi/host/pci_generic.c
+++ b/drivers/bus/mhi/host/pci_generic.c
@@ -1479,6 +1479,7 @@ static void mhi_pci_remove(struct pci_dev *pdev)
 	struct mhi_pci_device *mhi_pdev = pci_get_drvdata(pdev);
 	struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl;
 
+	pm_runtime_dont_use_autosuspend(&pdev->dev);
 	pm_runtime_forbid(&pdev->dev);
 	pci_disable_sriov(pdev);
 
-- 
2.43.0