@@ -1185,20 +1185,20 @@ module_param_call(policy, pcie_aspm_set_policy, pcie_aspm_get_policy,
/**
* pcie_aspm_enabled - Check if PCIe ASPM has been enabled for a device.
* @pdev: Target device.
+ *
+ * Relies on the upstream bridge's link_state being valid. The link_state
+ * is deallocated only when the last child of the bridge (i.e., @pdev or a
+ * sibling) is removed, and the caller should be holding a reference to
+ * @pdev, so this should be safe.
*/
bool pcie_aspm_enabled(struct pci_dev *pdev)
{
struct pci_dev *bridge = pci_upstream_bridge(pdev);
- bool ret;
if (!bridge)
return false;
- mutex_lock(&aspm_lock);
- ret = bridge->link_state ? !!bridge->link_state->aspm_enabled : false;
- mutex_unlock(&aspm_lock);
-
- return ret;
+ return bridge->link_state ? !!bridge->link_state->aspm_enabled : false;
}
EXPORT_SYMBOL_GPL(pcie_aspm_enabled);