If plug out device form xhci with runtime suspend enabled. On the one hand, driver will disconnect this device and send disabled slot command to xhci.

On the other hand, without no device connect to xhci, PM core will call xhci suspend function to let xhci go to D3 to save power.

However there is a temporal competition to get xhci lock between disable slot command interrupt and xhci suspend.

If xhci suspend function get xhci lock first, then this function will clear xhci command ring. It will get error command trb when driver to handle disable slot command interrupt. This is a serious error for driver and driver will cleanup xhci. So，any device connect to this xhci port again will not be recognized.

In order to fix this issues, we let disable slot command interrupt ISR to get xhci lock first. So, add a delay in xhci suspend function before to get xhci lock.

Signed-off-by: LeoLiu-oc LeoLiu-oc@zhaoxin.com ---  drivers/usb/host/xhci-pci.c | 2 ++  1 file changed, 2 insertions(+)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c index 583a8e895..83aa8e179 100644 --- a/drivers/usb/host/xhci-pci.c +++ b/drivers/usb/host/xhci-pci.c @@ -272,6 +272,8 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)          xhci->quirks |= XHCI_LPM_SUPPORT;          xhci->quirks |= XHCI_ZHAOXIN_HOST;      } +    if (pdev->vendor == PCI_VENDOR_ID_ZHAOXIN) +        xhci->quirks |= XHCI_SUSPEND_DELAY;

/* See https://bugzilla.kernel.org/show_bug.cgi?id=79511 */      if (pdev->vendor == PCI_VENDOR_ID_VIA &&