[PATCH v2] PCI: endpoint: Set endpoint controller pointer to null

[Alan Mikhak]

Set endpoint controller pointer to null in pci_epc_remove_epf()
to avoid -EBUSY on subsequent call to pci_epc_add_epf().

Requires checking for null endpoint function pointer.

Signed-off-by: Alan Mikhak <alan.mik...@sifive.com>
---
 drivers/pci/endpoint/pci-epc-core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/endpoint/pci-epc-core.c 
b/drivers/pci/endpoint/pci-epc-core.c
index e4712a0f249c..2091508c1620 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -519,11 +519,12 @@ void pci_epc_remove_epf(struct pci_epc *epc, struct 
pci_epf *epf)
 {
        unsigned long flags;
 
-       if (!epc || IS_ERR(epc))
+       if (!epc || IS_ERR(epc) || !epf)
                return;
 
        spin_lock_irqsave(&epc->lock, flags);
        list_del(&epf->list);
+       epf->epc = NULL;
        spin_unlock_irqrestore(&epc->lock, flags);
 }
 EXPORT_SYMBOL_GPL(pci_epc_remove_epf);
-- 
2.7.4