When deregistering a DCA device, function unregister_dca_provider() will notify clients by DCA_PROVIDER_REMOVE to stop DCA operations at beginning. Currently DCA operations won't be restarted by unregister_dca_provider() even if there are still DCA devices left. This may cause trouble to systems with multiple DCA devices/IOHs. So restart DCA operations if there are still DCA devices left after removing a DCA device. Signed-off-by: Jiang Liu <liuj97@xxxxxxxxx> --- drivers/dca/dca-core.c | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/drivers/dca/dca-core.c b/drivers/dca/dca-core.c index 075c4bd..f8cfa58 100644 --- a/drivers/dca/dca-core.c +++ b/drivers/dca/dca-core.c @@ -414,6 +414,7 @@ void unregister_dca_provider(struct dca_provider *dca, struct device *dev) unsigned long flags; struct pci_bus *pci_rc; struct dca_domain *domain; + bool restart = false; blocking_notifier_call_chain(&dca_provider_chain, DCA_PROVIDER_REMOVE, NULL); @@ -427,9 +428,20 @@ void unregister_dca_provider(struct dca_provider *dca, struct device *dev) if (list_empty(&domain->dca_providers)) dca_free_domain(domain); + if (!list_empty(&dca_domains)) + restart = true; + raw_spin_unlock_irqrestore(&dca_lock, flags); dca_sysfs_remove_provider(dca); + + /* + * Notify DCA clients to restart DCA operations if there are still + * DCA devices left. + */ + if (restart) + blocking_notifier_call_chain(&dca_provider_chain, + DCA_PROVIDER_ADD, NULL); } EXPORT_SYMBOL_GPL(unregister_dca_provider); -- 1.7.5.4 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
