On a loaded virtualization host (dozen guests booting at the same time)
it may happen that the ohci controller emulation doesn't manage to do
timely frame processing, with the result that the io watchdog fires and
considers the controller being dead, even though it's only the emulation
being unusual slow due to the load peak.

So, add a quirk for qemu and don't use the watchdog in case we figure we
are running on emulated ohci.  The virtual ohci controller masquerades
as apple ohci controller, but we can identify it by subsystem id.

Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
---
 drivers/usb/host/ohci-hcd.c |  3 ++-
 drivers/usb/host/ohci-pci.c | 16 ++++++++++++++++
 drivers/usb/host/ohci.h     |  1 +
 3 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index b6daf2e..5f81a2b 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -231,7 +231,8 @@ static int ohci_urb_enqueue (
 
                /* Start up the I/O watchdog timer, if it's not running */
                if (!timer_pending(&ohci->io_watchdog) &&
-                               list_empty(&ohci->eds_in_use)) {
+                               list_empty(&ohci->eds_in_use) &&
+                               !(ohci->flags & OHCI_QUIRK_QEMU)) {
                        ohci->prev_frame_no = ohci_frame_no(ohci);
                        mod_timer(&ohci->io_watchdog,
                                        jiffies + IO_WATCHDOG_DELAY);
diff --git a/drivers/usb/host/ohci-pci.c b/drivers/usb/host/ohci-pci.c
index bb15096..a84aebe 100644
--- a/drivers/usb/host/ohci-pci.c
+++ b/drivers/usb/host/ohci-pci.c
@@ -164,6 +164,15 @@ static int ohci_quirk_amd700(struct usb_hcd *hcd)
        return 0;
 }
 
+static int ohci_quirk_qemu(struct usb_hcd *hcd)
+{
+       struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+
+       ohci->flags |= OHCI_QUIRK_QEMU;
+       ohci_dbg(ohci, "enabled qemu quirk\n");
+       return 0;
+}
+
 /* List of quirks for OHCI */
 static const struct pci_device_id ohci_pci_quirks[] = {
        {
@@ -214,6 +223,13 @@ static int ohci_quirk_amd700(struct usb_hcd *hcd)
                PCI_DEVICE(PCI_VENDOR_ID_ATI, 0x4399),
                .driver_data = (unsigned long)ohci_quirk_amd700,
        },
+       {
+               .vendor         = PCI_VENDOR_ID_APPLE,
+               .device         = 0x003f,
+               .subvendor      = PCI_SUBVENDOR_ID_REDHAT_QUMRANET,
+               .subdevice      = PCI_SUBDEVICE_ID_QEMU,
+               .driver_data    = (unsigned long)ohci_quirk_qemu,
+       },
 
        /* FIXME for some of the early AMD 760 southbridges, OHCI
         * won't work at all.  blacklist them.
diff --git a/drivers/usb/host/ohci.h b/drivers/usb/host/ohci.h
index 37f1725..a51b189 100644
--- a/drivers/usb/host/ohci.h
+++ b/drivers/usb/host/ohci.h
@@ -418,6 +418,7 @@ struct ohci_hcd {
 #define        OHCI_QUIRK_AMD_PLL      0x200                   /* AMD PLL 
quirk*/
 #define        OHCI_QUIRK_AMD_PREFETCH 0x400                   /* pre-fetch 
for ISO transfer */
 #define        OHCI_QUIRK_GLOBAL_SUSPEND       0x800           /* must suspend 
ports */
+#define        OHCI_QUIRK_QEMU         0x1000                  /* relax timing 
expectations */
 
        // there are also chip quirks/bugs in init logic
 
-- 
1.8.3.1

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