[Qemu-devel] [PATCH 34/36] xhci: allow disabling interrupters

[Gerd Hoffmann]

For secondary interrupters this is explicitly allowed in the specs.
For the primary interrupter behavior is undefined, lets be friendly
and allow disabling too.

Signed-off-by: Gerd Hoffmann <address@hidden>
---
 hw/usb/hcd-xhci.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
index d8d1226..bd8d4a5 100644
--- a/hw/usb/hcd-xhci.c
+++ b/hw/usb/hcd-xhci.c
@@ -964,6 +964,12 @@ static void xhci_er_reset(XHCIState *xhci, int v)
     XHCIInterrupter *intr = &xhci->intr[v];
     XHCIEvRingSeg seg;
 
+    if (intr->erstsz == 0) {
+        /* disabled */
+        intr->er_start = 0;
+        intr->er_size = 0;
+        return;
+    }
     /* cache the (sole) event ring segment location */
     if (intr->erstsz != 1) {
         fprintf(stderr, "xhci: invalid value for ERSTSZ: %d\n", intr->erstsz);
-- 
1.7.1