Merge branch 'pxa-devel' into pxa

[pandora-kernel.git] / drivers / pci / pcie / aspm.c

diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index 61fedb2..f824955 100644 (file)
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -506,6 +506,23 @@ static void free_link_state(struct pci_dev *pdev)
        pdev->link_state = NULL;
 }
 
+static int pcie_aspm_sanity_check(struct pci_dev *pdev)
+{
+       struct pci_dev *child_dev;
+       int child_pos;
+
+       /*
+        * Some functions in a slot might not all be PCIE functions, very
+        * strange. Disable ASPM for the whole slot
+        */
+       list_for_each_entry(child_dev, &pdev->subordinate->devices, bus_list) {
+               child_pos = pci_find_capability(child_dev, PCI_CAP_ID_EXP);
+               if (!child_pos)
+                       return -EINVAL;
+       }
+       return 0;
+}
+
 /*
  * pcie_aspm_init_link_state: Initiate PCI express link state.
  * It is called after the pcie and its children devices are scaned.
@@ -526,6 +543,9 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev)
        if (list_empty(&pdev->subordinate->devices))
                goto out;
 
+       if (pcie_aspm_sanity_check(pdev))
+               goto out;
+
        mutex_lock(&aspm_lock);
 
        link_state = kzalloc(sizeof(*link_state), GFP_KERNEL);