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-rw-r--r--drivers/pci/pcie/aspm.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index 61fedb2448b6..f82495583e63 100644
--- 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)
506 pdev->link_state = NULL; 506 pdev->link_state = NULL;
507} 507}
508 508
509static int pcie_aspm_sanity_check(struct pci_dev *pdev)
510{
511 struct pci_dev *child_dev;
512 int child_pos;
513
514 /*
515 * Some functions in a slot might not all be PCIE functions, very
516 * strange. Disable ASPM for the whole slot
517 */
518 list_for_each_entry(child_dev, &pdev->subordinate->devices, bus_list) {
519 child_pos = pci_find_capability(child_dev, PCI_CAP_ID_EXP);
520 if (!child_pos)
521 return -EINVAL;
522 }
523 return 0;
524}
525
509/* 526/*
510 * pcie_aspm_init_link_state: Initiate PCI express link state. 527 * pcie_aspm_init_link_state: Initiate PCI express link state.
511 * It is called after the pcie and its children devices are scaned. 528 * 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)
526 if (list_empty(&pdev->subordinate->devices)) 543 if (list_empty(&pdev->subordinate->devices))
527 goto out; 544 goto out;
528 545
546 if (pcie_aspm_sanity_check(pdev))
547 goto out;
548
529 mutex_lock(&aspm_lock); 549 mutex_lock(&aspm_lock);
530 550
531 link_state = kzalloc(sizeof(*link_state), GFP_KERNEL); 551 link_state = kzalloc(sizeof(*link_state), GFP_KERNEL);