PCI/AER: Use list_first_entry_or_null() to simplify code

Use list_first_entry_or_null() instead of list_empty() + list_entry() to
simplify the code.

Signed-off-by: Geliang Tang <geliangtang@163.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/drivers/pci/pcie/aer/aer_inject.c b/drivers/pci/pcie/aer/aer_inject.c
index 79a5e11..e2760a3 100644 (file)
--- a/drivers/pci/pcie/aer/aer_inject.c
+++ b/drivers/pci/pcie/aer/aer_inject.c
@@ -124,16 +124,13 @@ static struct pci_ops *__find_pci_bus_ops(struct pci_bus *bus)
 static struct pci_bus_ops *pci_bus_ops_pop(void)
 {
        unsigned long flags;
-       struct pci_bus_ops *bus_ops = NULL;
+       struct pci_bus_ops *bus_ops;
 
        spin_lock_irqsave(&inject_lock, flags);
-       if (list_empty(&pci_bus_ops_list))
-               bus_ops = NULL;
-       else {
-               struct list_head *lh = pci_bus_ops_list.next;
-               list_del(lh);
-               bus_ops = list_entry(lh, struct pci_bus_ops, list);
-       }
+       bus_ops = list_first_entry_or_null(&pci_bus_ops_list,
+                                          struct pci_bus_ops, list);
+       if (bus_ops)
+               list_del(&bus_ops->list);
        spin_unlock_irqrestore(&inject_lock, flags);
        return bus_ops;
 }