From: Gerd Hoffmann <kraxel@redhat.com>
Date: Tue, 19 Mar 2013 08:18:20 +0000 (+0100)
Subject: xhci: fix numintrs sanity checks
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c94a7c6979cafa7a71f32b35e0ff71ed00c61a89;p=qemu.git

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 5aa342bda5..9d06c51f9c 100644
--- 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;
     }