[PATCH 08/23] PNPACPI: Fix device ref leaking in acpi_pnp_match

Yinghai Lu
2012-03-06T07:15:47Z

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@kernel.org>
Cc: stable@kernel.org
Cc: Len Brown <lenb@kernel.org>
Cc: Adam Belay <abelay@mit.edu>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: linux-acpi@vger.kernel.org
---
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