Commit c419fcfd authored May 23, 2012 by Maciej Sosnowski Committed by Vinod Koul Jan 07, 2013

dca: check against empty dca_domains list before unregister provider



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.

Cc: <stable@vger.kernel.org>
Reported-by: Jiang Liu <jiang.liu@huawei.com>
Tested-by: Gaohuai Han <hangaohuai@huawei.com>
Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Dan Williams <djbw@fb.com>

parent 6decffd5

drivers/dca/dca-core.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -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);