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PCI/PME: Restructure pcie_pme_suspend() to prevent compiler warning

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Previously we had this:

  if (wakeup)
    ret = enable_irq_wake(...);
  if (!wakeup || ret)
    ...

"ret" is only evaluated when "wakeup" is true, and it is always initialized
in that case, but gcc isn't smart enough to figure that out and warns:

  drivers/pci/pcie/pme.c:414:14: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized]

Restructure the code slightly to make it easier for gcc (and maybe for
humans as well).

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com
This commit is contained in:
Bjorn Helgaas 2016-02-05 14:57:19 -06:00
parent 4e48fe4148
commit 41ccebaece
1 changed files with 6 additions and 3 deletions
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9
drivers/pci/pcie/pme.c
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@ -396,7 +396,7 @@ static int pcie_pme_suspend(struct pcie_device *srv)
{
struct pcie_pme_service_data *data = get_service_data(srv);
struct pci_dev *port = srv->port;
bool wakeup;
bool wakeup, wake_irq_enabled = false;
int ret;
if (device_may_wakeup(&port->dev)) {
@ -409,9 +409,12 @@ static int pcie_pme_suspend(struct pcie_device *srv)
spin_lock_irq(&data->lock);
if (wakeup) {
ret = enable_irq_wake(srv->irq);
data->suspend_level = PME_SUSPEND_WAKEUP;
if (ret == 0) {
data->suspend_level = PME_SUSPEND_WAKEUP;
wake_irq_enabled = true;
}
}
if (!wakeup || ret) {
if (!wake_irq_enabled) {
pcie_pme_interrupt_enable(port, false);
pcie_clear_root_pme_status(port);
data->suspend_level = PME_SUSPEND_NOIRQ;