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 <kra...@redhat.com>
---
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
