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dca: check against empty dca_domains list before unregister provider

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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: <[email protected]>
Reported-by: Jiang Liu <[email protected]>
Tested-by: Gaohuai Han <[email protected]>
Signed-off-by: Maciej Sosnowski <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
This commit is contained in:
Maciej Sosnowski 2012-05-23 17:27:07 +02:00 • committed by Vinod Koul
commit c419fcfd07
1 changed files with 5 additions and 0 deletions
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5
drivers/dca/dca-core.c
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@ -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);