PNPACPI: Fix device ref leaking in acpi_pnp_match

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 pu_device calling before returning.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/pnp/pnpacpi/core.c b/drivers/pnp/pnpacpi/core.c
index b00c17612a89..d21e8f59c84e 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));
 }