dca: check against empty dca_domains list before unregister provider

Message ID 20120523152707.31683.81714.stgit@linux.site
State Not Applicable
Headers show

Commit Message

Sosnowski, Maciej May 23, 2012, 3:27 p.m.
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@huawei.com>
Tested-by: Gaohuai Han <hangaohuai@huawei.com>
Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com>

 drivers/dca/dca-core.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

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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_
 	raw_spin_lock_irqsave(&dca_lock, flags);
+	if (list_empty(&dca_domains)) {
+		raw_spin_unlock_irqrestore(&dca_lock, flags);
+		return;
+	}
 	pci_rc = dca_pci_rc_from_dev(dev);