[PATCH v2 02/37] PNPACPI: Fix device ref leaking in acpi_pnp_match

[Yinghai Lu]

During testing pci root bus removal, found some root bus bridge is not freed.

If booting with pnpacpi=off, those hostbridge could be freed without problem.

It turns out that some devices reference are not released during acpi_pnp_match.

That match should not hold one device ref during every calling.

Add put_device calling before returning.

Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
Cc: stable@xxxxxxxxxx
Cc: Len Brown <lenb@xxxxxxxxxx>
Cc: Adam Belay <abelay@xxxxxxx>
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: linux-acpi@xxxxxxxxxxxxxxx
---
 drivers/pnp/pnpacpi/core.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/drivers/pnp/pnpacpi/core.c b/drivers/pnp/pnpacpi/core.c
index b00c176..d21e8f5 100644
--- a/drivers/pnp/pnpacpi/core.c
+++ b/drivers/pnp/pnpacpi/core.c
@@ -321,9 +321,14 @@ static int __init acpi_pnp_match(struct device *dev, void *_pnp)
 {
 	struct acpi_device *acpi = to_acpi_device(dev);
 	struct pnp_dev *pnp = _pnp;
+	struct device *physical_device;
+
+	physical_device = acpi_get_physical_device(acpi->handle);
+	if (physical_device)
+		put_device(physical_device);
 
 	/* true means it matched */
-	return !acpi_get_physical_device(acpi->handle)
+	return !physical_device
 	    && compare_pnp_id(pnp->id, acpi_device_hid(acpi));
 }
 
-- 
1.7.7

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