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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>
Acked-by: Anthony PERARD <anthony.perard@citrix.com>
Message-id: 1470140044-16492-3-git-send-email-jgross@suse.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Juergen Gross 2016-08-02 14:14:04 +02:00 committed by Gerd Hoffmann
parent c8e36e865c
commit 80440ea033
1 changed files with 62 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

94
hw/usb/xen-usb.c
View File

@ -90,6 +90,8 @@ struct usbback_req {
void *buffer;
void *isoc_buffer;
struct libusb_transfer *xfer;
bool cancelled;
};
struct usbback_hotplug {
@ -301,20 +303,23 @@ 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 (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);
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,
@ -366,15 +371,14 @@ 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)
@ -391,7 +395,7 @@ 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;
@ -406,9 +410,7 @@ 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;
}
}
@ -681,6 +683,33 @@ 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;
@ -694,9 +723,7 @@ 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);
}
@ -801,7 +828,6 @@ 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");
@ -820,11 +846,8 @@ 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);
}
}
@ -944,8 +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)
@ -958,9 +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);
}
@ -1037,6 +1066,7 @@ static int usbback_free(struct XenDevice *xendev)
}
usb_bus_release(&usbif->bus);
object_unparent(OBJECT(&usbif->bus));
TR_BUS(xendev, "finished\n");