xhci: fix numintrs sanity checks

Make sure numintrs is a power of two, msi requires this.

https://bugzilla.redhat.com/show_bug.cgi?id=918035

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
index 5aa342bda5a99ff4660198e41d354790b5d0607f..9d06c51f9c598665b9744e223a8f9390700638fb 100644 (file)
--- a/hw/usb/hcd-xhci.c
+++ b/hw/usb/hcd-xhci.c
@@ -3290,6 +3290,9 @@ static int usb_xhci_initfn(struct PCIDevice *dev)
     if (xhci->numintrs > MAXINTRS) {
         xhci->numintrs = MAXINTRS;
     }
+    while (xhci->numintrs & (xhci->numintrs - 1)) {   /* ! power of 2 */
+        xhci->numintrs++;
+    }
     if (xhci->numintrs < 1) {
         xhci->numintrs = 1;
     }