* [PATCH] dca: check against empty dca_domains list before unregister provider
@ 2012-05-23 15:27 Maciej Sosnowski
0 siblings, 0 replies; only message in thread
From: Maciej Sosnowski @ 2012-05-23 15:27 UTC (permalink / raw)
To: dan.j.williams; +Cc: jiang.liu, chenkeping, linux-kernel, netdev, linux-pci
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(-)
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;
+ }
+
list_del(&dca->node);
pci_rc = dca_pci_rc_from_dev(dev);
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2012-05-23 15:27 [PATCH] dca: check against empty dca_domains list before unregister provider Maciej Sosnowski
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