Commit 3ae7eb88 authored by Gerd Hoffmann's avatar Gerd Hoffmann
Browse files

ehci: fix overflow in frame timer code 



In case the frame timer doesn't run for a while due to the host being
busy skipped_uframes can become big enough that UFRAME_TIMER_NS *
skipped_uframes overflows.  Which in turn throws off all subsequent
ehci frame timer calculations.

Reported-by: default avatar李林 <8610_28@163.com>
Signed-off-by: default avatarGerd Hoffmann <kraxel@redhat.com>
Reviewed-by: default avatarPhilippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20170515104543.32044-1-kraxel@redhat.com
parent 9964e96d

hw/usb/hcd-ehci.c

+1 −1
Original line number Diff line number Diff line
@@ -2238,7 +2238,7 @@ static void ehci_frame_timer(void *opaque) 
    int need_timer = 0;

    int64_t expire_time, t_now;

    uint64_t ns_elapsed;

    int uframes, skipped_uframes;

    uint64_t uframes, skipped_uframes;

    int i;



    t_now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);