| Date | Mon, 04 Mar 2013 03:37:14 +0000 | From | Ben Hutchings <> | Subject | [ 007/153] dca: check against empty dca_domains list before unregister provider |
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3.2-stable review patch. If anyone has any objections, please let me know.
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From: Maciej Sosnowski <maciej.sosnowski@intel.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@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> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- drivers/dca/dca-core.c | 5 +++++ 1 file changed, 5 insertions(+)
--- 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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