linux-kernel - [PATCH 081/139] dca: check against empty dca_domains list before unregister provider

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Message-Id: <1362062689-2567-82-git-send-email-luis.henriques@canonical.com>
Date:	Thu, 28 Feb 2013 14:43:51 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Maciej Sosnowski <maciej.sosnowski@...el.com>,
	Dan Williams <djbw@...com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 081/139] dca: check against empty dca_domains list before unregister provider

3.5.7.7 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Maciej Sosnowski <maciej.sosnowski@...el.com>

commit c419fcfd071cf34ba00f9f65282583772d2655e7 upstream.

When providers get blocked unregister_dca_providers() is called ending up
with dca_providers and dca_domain lists emptied. Dca should be prevented from
trying to unregister any provider if dca_domain list is found empty.

Reported-by: Jiang Liu <jiang.liu@...wei.com>
Tested-by: Gaohuai Han <hangaohuai@...wei.com>
Signed-off-by: Maciej Sosnowski <maciej.sosnowski@...el.com>
Signed-off-by: Dan Williams <djbw@...com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/dca/dca-core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/dca/dca-core.c b/drivers/dca/dca-core.c
index bc6f5fa..819dfda 100644
--- a/drivers/dca/dca-core.c
+++ b/drivers/dca/dca-core.c
@@ -420,6 +420,11 @@ void unregister_dca_provider(struct dca_provider *dca, struct device *dev)
 
 	raw_spin_lock_irqsave(&dca_lock, flags);
 
+	if (list_empty(&dca_domains)) {
+		raw_spin_unlock_irqrestore(&dca_lock, flags);
+		return;
+	}
+
 	list_del(&dca->node);
 
 	pci_rc = dca_pci_rc_from_dev(dev);
-- 
1.8.1.2

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