On Thu, Aug 25, 2022 at 03:47:10PM +0530, Kishon Vijay Abraham I wrote:
> Hi Mani,
>
> On 11/08/22 15:12, Manivannan Sadhasivam wrote:
> > As a part of the transition towards callback mechanism for signalling the
> > events from EPC to EPF, let's use the link_up() callback in the place of
> > the LINK_UP notifier. This also removes the notifier support completely
> > from the PCI endpoint framework.
> >
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
> > ---
> > drivers/pci/endpoint/functions/pci-epf-test.c | 33 ++++++-------------
> > drivers/pci/endpoint/pci-epc-core.c | 8 +++--
> > include/linux/pci-epc.h | 8 -----
> > include/linux/pci-epf.h | 8 ++---
> > 4 files changed, 18 insertions(+), 39 deletions(-)
> >
>
> .
> .
> <snip>
> .
> .
> > diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
> > index 805f3d64f93b..a51ba9f158c3 100644
> > --- a/drivers/pci/endpoint/pci-epc-core.c
> > +++ b/drivers/pci/endpoint/pci-epc-core.c
> > @@ -690,10 +690,15 @@ EXPORT_SYMBOL_GPL(pci_epc_remove_epf);
> > */
> > void pci_epc_linkup(struct pci_epc *epc)
> > {
> > + struct pci_epf *epf;
> > +
> > if (!epc || IS_ERR(epc))
> > return;
> >
> > - atomic_notifier_call_chain(&epc->notifier, LINK_UP, NULL);
> > + list_for_each_entry(epf, &epc->pci_epf, list) {
> > + if (epf->event_ops->link_up)
> > + epf->event_ops->link_up(epf);
> > + }
>
> how do you ensure there is no race while invoking the call back
> functions during add/remove of epf?
>
Good catch! These should be guarded by epf->lock.
Thanks,
Mani
> Thanks,
> Kishon
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