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usb-ehci: Ensure frindex writes leave a valid frindex value

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frindex is a 14 bits counter, so bits 31-14 should always be 0, and
after the commit titled "usb-ehci: frindex always is a 14 bits counter"
we rely on frindex always being a multiple of 8. I've not seen this in
practice, but theoretically a guest can write a value >= 0x4000 or a value
which is not a multiple of 8 value to frindex, this patch ensures that
things will still work when that happens.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Hans de Goede 2012-04-03 14:21:47 +02:00 committed by Gerd Hoffmann
parent 0cc6a0f19e
commit 8a771f77e2
1 changed files with 4 additions and 0 deletions
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4
hw/usb/hcd-ehci.c
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@ -1101,6 +1101,10 @@ static void ehci_mem_writel(void *ptr, target_phys_addr_t addr, uint32_t val)
val &= USBINTR_MASK;
break;
case FRINDEX:
val &= 0x00003ff8; /* frindex is 14bits and always a multiple of 8 */
break;
case CONFIGFLAG:
val &= 0x1;
if (val) {