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SUSE:SLE-12-SP4:Update
qemu.19799
0057-xen-drain-submit-queue-in-xen-usb-b.patch
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File 0057-xen-drain-submit-queue-in-xen-usb-b.patch of Package qemu.19799
From: Juergen Gross <jgross@suse.com> Date: Wed, 27 Jul 2016 08:17:41 +0200 Subject: xen: drain submit queue in xen-usb before removing device When unplugging a device in the Xen pvusb backend drain the submit queue before deallocation of the control structures. Otherwise there will be bogus memory accesses when I/O contracts are finished. Correlated to this issue is the handling of cancel requests: a packet cancelled will still lead to the call of complete, so add a flag to the request indicating it should be just dropped on complete. Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Bruce Rogers <brogers@suse.com> --- hw/usb/xen-usb.c | 95 +++++++++++++++++++++++++++++++----------------- 1 file changed, 61 insertions(+), 34 deletions(-) diff --git a/hw/usb/xen-usb.c b/hw/usb/xen-usb.c index 664df04181918082f6fc8b579c5c..6f4b99d796c7a019e5094b7e3246 100644 --- a/hw/usb/xen-usb.c +++ b/hw/usb/xen-usb.c @@ -94,6 +94,8 @@ struct usbback_req { void *buffer; void *isoc_buffer; struct libusb_transfer *xfer; + + bool cancelled; }; struct usbback_hotplug { @@ -304,20 +306,23 @@ static void usbback_do_response(struct usbback_req *usbback_req, int32_t status, usbback_req->isoc_buffer = NULL; } - res = RING_GET_RESPONSE(&usbif->urb_ring, usbif->urb_ring.rsp_prod_pvt); - res->id = usbback_req->req.id; - res->status = status; - res->actual_length = actual_length; - res->error_count = error_count; - res->start_frame = 0; - usbif->urb_ring.rsp_prod_pvt++; - RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&usbif->urb_ring, notify); - - if (notify) { - xen_be_send_notify(xendev); + if (usbif->urb_sring) { + res = RING_GET_RESPONSE(&usbif->urb_ring, usbif->urb_ring.rsp_prod_pvt); + res->id = usbback_req->req.id; + res->status = status; + res->actual_length = actual_length; + res->error_count = error_count; + res->start_frame = 0; + usbif->urb_ring.rsp_prod_pvt++; + RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&usbif->urb_ring, notify); + + if (notify) { + xen_be_send_notify(xendev); + } } - usbback_put_req(usbback_req); + if (!usbback_req->cancelled) + usbback_put_req(usbback_req); } static void usbback_do_response_ret(struct usbback_req *usbback_req, @@ -369,15 +374,14 @@ static void usbback_set_address(struct usbback_info *usbif, } } -static bool usbback_cancel_req(struct usbback_req *usbback_req) +static void usbback_cancel_req(struct usbback_req *usbback_req) { - bool ret = false; - if (usb_packet_is_inflight(&usbback_req->packet)) { usb_cancel_packet(&usbback_req->packet); - ret = true; + QTAILQ_REMOVE(&usbback_req->stub->submit_q, usbback_req, q); + usbback_req->cancelled = true; + usbback_do_response_ret(usbback_req, -EPROTO); } - return ret; } static void usbback_process_unlink_req(struct usbback_req *usbback_req) @@ -394,7 +398,7 @@ static void usbback_process_unlink_req(struct usbback_req *usbback_req) devnum = usbif_pipedevice(usbback_req->req.pipe); if (unlikely(devnum == 0)) { usbback_req->stub = usbif->ports + - usbif_pipeportnum(usbback_req->req.pipe); + usbif_pipeportnum(usbback_req->req.pipe) - 1; if (unlikely(!usbback_req->stub)) { ret = -ENODEV; goto fail_response; @@ -409,9 +413,7 @@ static void usbback_process_unlink_req(struct usbback_req *usbback_req) QTAILQ_FOREACH(unlink_req, &usbback_req->stub->submit_q, q) { if (unlink_req->req.id == id) { - if (usbback_cancel_req(unlink_req)) { - usbback_do_response_ret(unlink_req, -EPROTO); - } + usbback_cancel_req(unlink_req); break; } } @@ -684,6 +686,31 @@ static void usbback_hotplug_enq(struct usbback_info *usbif, unsigned port) usbback_hotplug_notify(usbif); } +static void usbback_portid_drain(struct usbback_info *usbif, unsigned port) +{ + struct usbback_req *req, *tmp; + bool sched = false; + + QTAILQ_FOREACH_SAFE(req, &usbif->ports[port - 1].submit_q, q, tmp) { + usbback_cancel_req(req); + sched = true; + } + + if (sched) + qemu_bh_schedule(usbif->bh); +} + +static void usbback_portid_detach(struct usbback_info *usbif, unsigned port) +{ + if (!usbif->ports[port - 1].attached) + return; + + usbif->ports[port - 1].speed = USBIF_SPEED_NONE; + usbif->ports[port - 1].attached = false; + usbback_portid_drain(usbif, port); + usbback_hotplug_enq(usbif, port); +} + static void usbback_portid_remove(struct usbback_info *usbif, unsigned port) { USBPort *p; @@ -697,9 +724,7 @@ static void usbback_portid_remove(struct usbback_info *usbif, unsigned port) object_unparent(OBJECT(usbif->ports[port - 1].dev)); usbif->ports[port - 1].dev = NULL; - usbif->ports[port - 1].speed = USBIF_SPEED_NONE; - usbif->ports[port - 1].attached = false; - usbback_hotplug_enq(usbif, port); + usbback_portid_detach(usbif, port); TR_BUS(&usbif->xendev, "port %d removed\n", port); } @@ -804,7 +829,6 @@ static void usbback_process_port(struct usbback_info *usbif, unsigned port) static void usbback_disconnect(struct XenDevice *xendev) { struct usbback_info *usbif; - struct usbback_req *req, *tmp; unsigned int i; TR_BUS(xendev, "start\n"); @@ -823,12 +847,8 @@ static void usbback_disconnect(struct XenDevice *xendev) } for (i = 0; i < usbif->num_ports; i++) { - if (!usbif->ports[i].dev) { - continue; - } - QTAILQ_FOREACH_SAFE(req, &usbif->ports[i].submit_q, q, tmp) { - usbback_cancel_req(req); - } + if (usbif->ports[i].dev) + usbback_portid_drain(usbif, i + 1); } TR_BUS(xendev, "finished\n"); @@ -947,8 +967,7 @@ static void xen_bus_detach(USBPort *port) usbif = port->opaque; TR_BUS(&usbif->xendev, "\n"); - usbif->ports[port->index].attached = false; - usbback_hotplug_enq(usbif, port->index + 1); + usbback_portid_detach(usbif, port->index + 1); } static void xen_bus_child_detach(USBPort *port, USBDevice *child) @@ -961,9 +980,16 @@ static void xen_bus_child_detach(USBPort *port, USBDevice *child) static void xen_bus_complete(USBPort *port, USBPacket *packet) { + struct usbback_req *usbback_req; struct usbback_info *usbif; - usbif = port->opaque; + usbback_req = container_of(packet, struct usbback_req, packet); + if (usbback_req->cancelled) { + g_free(usbback_req); + return; + } + + usbif = usbback_req->usbif; TR_REQ(&usbif->xendev, "\n"); usbback_packet_complete(packet); } @@ -1040,6 +1066,7 @@ static int usbback_free(struct XenDevice *xendev) } usb_bus_release(&usbif->bus); + object_unparent(OBJECT(&usbif->bus)); TR_BUS(xendev, "finished\n");
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