linux-kernel - [PATCH 67/76] PNPACPI: Fix device ref leaking in acpi_pnp

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Message-id: <89e96ada572fb216e582dbe3f64e1a6939a37f74.1333101989.git.len.brown@intel.com>
Date:	Fri, 30 Mar 2012 06:14:10 -0400
From:	Len Brown <lenb@...nel.org>
To:	linux-acpi@...r.kernel.org, linux-pm@...ts.linux-foundation.org
Cc:	linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>,
	stable@...r.kernel.org, Len Brown <len.brown@...el.com>
Subject: [PATCH 67/76] PNPACPI: Fix device ref leaking in acpi_pnp_match

From: Yinghai Lu <yinghai@...nel.org>

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@...nel.org>
Cc: stable@...r.kernel.org
Signed-off-by: Len Brown <len.brown@...el.com>
---
 drivers/pnp/pnpacpi/core.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

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));
 }
 
-- 
1.7.10.rc2.19.gfae9d

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