From: Robert Dobrowolski <robert.dobrowol...@linux.intel.com>
On BXT platform Host Controller and Device Controller figure as
same PCI device but with different device function. HCD should
not pass data to Device Controller but only to Host Controllers.
Checking if companion device is Host Controller, otherwise skip.
Cc: <sta...@vger.kernel.org>
Signed-off-by: Robert Dobrowolski <robert.dobrowol...@linux.intel.com>
---
Changes in v3:
- Removed footer from patch, added CC
Changes in v2:
- Changed condition to skip companion if its not known
host controller type
drivers/usb/core/hcd-pci.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c
index f9d42cf..7859d73 100644
--- a/drivers/usb/core/hcd-pci.c
+++ b/drivers/usb/core/hcd-pci.c
@@ -73,6 +73,15 @@ static void for_each_companion(struct pci_dev *pdev, struct
usb_hcd *hcd,
if (companion->bus != pdev->bus ||
PCI_SLOT(companion->devfn) != slot)
continue;
+
+ /*
+ * Companion device should be either UHCI,OHCI or EHCI host
+ * controller, otherwise skip.
+ */
+ if (companion->class != CL_UHCI && companion->class != CL_OHCI
&&
+ companion->class != CL_EHCI)
+ continue;
+
companion_hcd = pci_get_drvdata(companion);
if (!companion_hcd || !companion_hcd->self.root_hub)
continue;
--
1.9.1
--
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