Input: xen-kbdfront - fix mouse getting stuck after save/restore

commit c36b58e8a9112017c2bcc322cc98e71241814303 upstream.

Mouse gets "stuck" after restore of PV guest but buttons are in working
condition.

If driver has been configured for ABS coordinates at start it will get
XENKBD_TYPE_POS events and then suddenly after restore it'll start getting
XENKBD_TYPE_MOTION events, that will be dropped later and they won't get
into user-space.

Regression was introduced by hunk 5 and 6 of
5ea5254aa0ad269cfbd2875c973ef25ab5b5e9db
("Input: xen-kbdfront - advertise either absolute or relative
coordinates").

Driver on restore should ask xen for request-abs-pointer again if it is
available. So restore parts that did it before 5ea5254.

Acked-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
[v1: Expanded the commit description]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

diff --git a/drivers/input/xen-kbdfront.c b/drivers/input/xen-kbdfront.c
index eb88f4089928609d35dafa68dcec731e5f74c98b..480d5d24273559a0a4d40c8d399cdafa53696286 100644 (file)
--- a/drivers/input/xen-kbdfront.c
+++ b/drivers/input/xen-kbdfront.c
@@ -281,7 +281,7 @@ static void xenkbd_backend_changed(struct xenbus_device *dev,
                                   enum xenbus_state backend_state)
 {
        struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
-       int val;
+       int ret, val;
 
        switch (backend_state) {
        case XenbusStateInitialising:
@@ -292,6 +292,16 @@ static void xenkbd_backend_changed(struct xenbus_device *dev,
 
        case XenbusStateInitWait:
 InitWait:
+               ret = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
+                                  "feature-abs-pointer", "%d", &val);
+               if (ret < 0)
+                       val = 0;
+               if (val) {
+                       ret = xenbus_printf(XBT_NIL, info->xbdev->nodename,
+                                           "request-abs-pointer", "1");
+                       if (ret)
+                               pr_warning("can't request abs-pointer\n");
+               }
                xenbus_switch_state(dev, XenbusStateConnected);
                break;