[Qemu-devel] [PATCH 1/2] usb: XHCI shall not halt isochronous endpoints

[Yuri Benditovich]

According to the XHCI spec (4.10.2) the controller
never halts isochronous endpoints. This commit prevent
stop of isochronous streaming when sporadic errors
status received from backends.

Signed-off-by: Yuri Benditovich <address@hidden>
---
 hw/usb/hcd-xhci.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
index 8f1a01a..1a8fd96 100644
--- a/hw/usb/hcd-xhci.c
+++ b/hw/usb/hcd-xhci.c
@@ -1571,6 +1571,11 @@ static void xhci_stall_ep(XHCITransfer *xfer)
     uint32_t err;
     XHCIStreamContext *sctx;
 
+    if (epctx->type == ET_ISO_IN || epctx->type == ET_ISO_OUT) {
+        /* never halt isoch endpoints, 4.10.2 */
+        return;
+    }
+
     if (epctx->nr_pstreams) {
         sctx = xhci_find_stream(epctx, xfer->streamid, &err);
         if (sctx == NULL) {
-- 
2.9.5