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authorMathias Nyman <mathias.nyman@linux.intel.com>2014-03-03 19:30:17 +0200
committerSarah Sharp <sarah.a.sharp@linux.intel.com>2014-03-06 13:46:55 -0800
commitbcffae7708eb8352f44dc510b326541fe43a02a4 (patch)
tree73fe0025c28060ac45e8f5e2e346894c910ed227
parent14aec589327a6fc4035f5327d90ac5548f501c4c (diff)
xhci: Prevent runtime pm from autosuspending during initialization
xHCI driver has its own pci probe function that will call usb_hcd_pci_probe to register its usb-2 bus, and then continue to manually register the usb-3 bus. usb_hcd_pci_probe does a pm_runtime_put_noidle at the end and might thus trigger a runtime suspend before the usb-3 bus is ready. Prevent the runtime suspend by increasing the usage count in the beginning of xhci_pci_probe, and decrease it once the usb-3 bus is ready. xhci-platform driver is not using usb_hcd_pci_probe to set up busses and should not need to have it's usage count increased during probe. Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Acked-by: Dan Williams <dan.j.williams@intel.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Cc: stable@vger.kernel.org
-rw-r--r--drivers/usb/host/xhci-pci.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index cbf0c5cffc92..47390e369cd4 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -190,6 +190,10 @@ static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
struct usb_hcd *hcd;
driver = (struct hc_driver *)id->driver_data;
+
+ /* Prevent runtime suspending between USB-2 and USB-3 initialization */
+ pm_runtime_get_noresume(&dev->dev);
+
/* Register the USB 2.0 roothub.
* FIXME: USB core must know to register the USB 2.0 roothub first.
* This is sort of silly, because we could just set the HCD driver flags
@@ -199,7 +203,7 @@ static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
retval = usb_hcd_pci_probe(dev, id);
if (retval)
- return retval;
+ goto put_runtime_pm;
/* USB 2.0 roothub is stored in the PCI device now. */
hcd = dev_get_drvdata(&dev->dev);
@@ -225,12 +229,17 @@ static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
xhci->shared_hcd->can_do_streams = 1;
+ /* USB-2 and USB-3 roothubs initialized, allow runtime pm suspend */
+ pm_runtime_put_noidle(&dev->dev);
+
return 0;
put_usb3_hcd:
usb_put_hcd(xhci->shared_hcd);
dealloc_usb2_hcd:
usb_hcd_pci_remove(dev);
+put_runtime_pm:
+ pm_runtime_put_noidle(&dev->dev);
return retval;
}