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authorIgor Mammedov <imammedo@redhat.com>2011-04-18 10:17:17 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2011-05-02 09:19:50 -0700
commit80ac2fd6758b75a1f1db112821635e3411185073 (patch)
treeb4dffa7df7905284fa40b2be1fac186bbeb9ca42
parent9ec3e481f696880fd11e24ff54da6252d3d1a986 (diff)
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>
-rw-r--r--drivers/input/xen-kbdfront.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/input/xen-kbdfront.c b/drivers/input/xen-kbdfront.c
index 53e62732ee96..c35ab940f1f0 100644
--- a/drivers/input/xen-kbdfront.c
+++ b/drivers/input/xen-kbdfront.c
@@ -286,7 +286,7 @@ 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:
@@ -299,6 +299,16 @@ 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;