USB: EHCI: remove PCI assumption

This patch (as1405) fixes a small bug in ehci-hcd's isochronous
scheduler.  Not all EHCI controllers are PCI, and the code shouldn't
assume that they are.  Instead, introduce a special flag for
controllers which need to delay iso scheduling for full-speed devices
beyond the scheduling threshold.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: Sarah Sharp <sarah.a.sharp@linux.intel.com>
CC: David Brownell <david-b@pacbell.net>
CC: stable <stable@kernel.org>
Acked-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index f555e4f..58b72d7 100644 (file)
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -114,6 +114,7 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
                break;
        case PCI_VENDOR_ID_INTEL:
                ehci->need_io_watchdog = 0;
+               ehci->fs_i_thresh = 1;
                if (pdev->device == 0x27cc) {
                        ehci->broken_periodic = 1;
                        ehci_info(ehci, "using broken periodic workaround\n");

diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index d640346..efadced 100644 (file)
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -1399,7 +1399,6 @@ iso_stream_schedule (
        int                     status;
        unsigned                mod = ehci->periodic_size << 3;
        struct ehci_iso_sched   *sched = urb->hcpriv;
-       struct pci_dev          *pdev;
 
        if (sched->span > (mod - SCHEDULE_SLOP)) {
                ehci_dbg (ehci, "iso request %p too long\n", urb);
@@ -1426,15 +1425,14 @@ iso_stream_schedule (
         * slot in the schedule, implicitly assuming URB_ISO_ASAP.
         */
        if (likely (!list_empty (&stream->td_list))) {
-               pdev = to_pci_dev(ehci_to_hcd(ehci)->self.controller);
                start = stream->next_uframe;
 
                /* For high speed devices, allow scheduling within the
-                * isochronous scheduling threshold.  For full speed devices,
-                * don't. (Work around for Intel ICH9 bug.)
+                * isochronous scheduling threshold.  For full speed devices
+                * and Intel PCI-based controllers, don't (work around for
+                * Intel ICH9 bug).
                 */
-               if (!stream->highspeed &&
-                               pdev->vendor == PCI_VENDOR_ID_INTEL)
+               if (!stream->highspeed && ehci->fs_i_thresh)
                        next = now + ehci->i_thresh;
                else
                        next = now;

diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index a4a63ce..2c050ef 100644 (file)
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -130,6 +130,7 @@ struct ehci_hcd {                   /* one per controller */
        unsigned                has_amcc_usb23:1;
        unsigned                need_io_watchdog:1;
        unsigned                broken_periodic:1;
+       unsigned                fs_i_thresh:1;  /* Intel iso scheduling */
 
        /* required for usb32 quirk */
        #define OHCI_CTRL_HCFS          (3 << 6)