On 2012/9/13 9:43, Huang Ying wrote: > On Wed, 2012-09-12 at 20:33 +0800, Yijing Wang wrote: >> Since hot plug for pci devices while doing aer inject, some newly created child buses' >> pci_ops will be assigned to pci_ops_aer. Aer_inject does not track these pci_ops_aer(not >> list in pci_bus_ops_list),we should clean all of these when rmmod aer_inject module. >> >> Signed-off-by: Yijing Wang <wangyijing@xxxxxxxxxx> >> --- >> drivers/pci/pcie/aer/aer_inject.c | 32 ++++++++++++++++++++++++++++++++ >> 1 files changed, 32 insertions(+), 0 deletions(-) >> >> diff --git a/drivers/pci/pcie/aer/aer_inject.c b/drivers/pci/pcie/aer/aer_inject.c >> index 0816483..9d195ae 100644 >> --- a/drivers/pci/pcie/aer/aer_inject.c >> +++ b/drivers/pci/pcie/aer/aer_inject.c >> @@ -283,6 +283,28 @@ static void pci_bus_ops_init(struct pci_bus_ops *bus_ops, >> bus_ops->ops = ops; >> } >> >> +static void pci_clean_child_aer_ops(struct pci_bus *bus) >> +{ >> + struct pci_bus *child; >> + >> + list_for_each_entry(child, &bus->children, node) { >> + if (child->ops == &pci_ops_aer) >> + pci_bus_set_ops(child, bus->ops); >> + pci_clean_child_aer_ops(child); >> + } >> +} >> + >> +/* find pci_ops_aer from root bus, and replace it by parent bus's pci_ops. >> + * pci_ops of root bus won't be pci_ops_aer here*/ > > Why scan all pci buses? Is it possible just to check buses in > pci_bus_ops_list. > Hi Huang Ying, Some buses' pci_ops_aer may be not assigned by pci_bus_set_aer_ops() function, As the first patch [PATCH v2 1/4] said. Some newly created buses' pci_ops assigned to pci_ops_aer because their parent just doing aer inject, parent bus's pci_ops was pci_ops_aer. So when we rmmod aer_inject module, these buses' pci_ops_aer will be invalid. 1、Tracked pci_ops_aer will be cleaned and pci_ops will reassign to their original pci_ops saved in pci_bus_ops_list. 2、Un-tracked pci_ops_aer won't be cleaned.so we need to fix it. > Best Regards, > Huang Ying > >> +static void clean_untracked_pci_ops_aer(void) >> +{ >> + struct pci_bus *bus = NULL; >> + >> + while ((bus = pci_find_next_bus(bus)) != NULL) >> + pci_clean_child_aer_ops(bus); >> +} >> + >> + >> static int pci_bus_set_aer_ops(struct pci_bus *bus) >> { >> struct pci_ops *ops; >> @@ -546,6 +568,8 @@ static void __exit aer_inject_exit(void) >> pci_bus_set_ops(bus_ops->bus, bus_ops->ops); >> kfree(bus_ops); >> } >> + >> + clean_untracked_pci_aer_ops(); >> >> spin_lock_irqsave(&inject_lock, flags); >> list_for_each_entry_safe(err, err_next, &einjected, list) { >> @@ -553,6 +577,14 @@ static void __exit aer_inject_exit(void) >> kfree(err); >> } >> spin_unlock_irqrestore(&inject_lock, flags); >> + >> + /* Inject aer errors and hotplug the same pcie device >> + * maybe assign some newly created buses' pci_ops pci_ops_aer. >> + * Since these pci_ops_aer are not tracked in pci_bus_ops_list, >> + * we need to find and clean untracked pci_ops_aer before aer_inject >> + * module exit >> + */ >> + clean_untracked_pci_ops_aer(); >> } >> >> module_init(aer_inject_init); > > > > . > -- Thanks! Yijing -- 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