From 81362c6f159dcb59fadd60927aa00497d715ca80 Mon Sep 17 00:00:00 2001 From: Juergen Gross Date: Mon, 31 Oct 2016 14:58:40 +0100 Subject: [PATCH] xen: make use of xenbus_read_unsigned() in xen-kbdfront Use xenbus_read_unsigned() instead of xenbus_scanf() when possible. This requires to change the type of the reads from int to unsigned, but these cases have been wrong before: negative values are not allowed for the modified cases. Cc: dmitry.torokhov@gmail.com Cc: linux-input@vger.kernel.org Signed-off-by: Juergen Gross Acked-by: David Vrabel --- drivers/input/misc/xen-kbdfront.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/drivers/input/misc/xen-kbdfront.c b/drivers/input/misc/xen-kbdfront.c index 227fbd2dbb71..3900875dec10 100644 --- a/drivers/input/misc/xen-kbdfront.c +++ b/drivers/input/misc/xen-kbdfront.c @@ -108,7 +108,8 @@ static irqreturn_t input_handler(int rq, void *dev_id) static int xenkbd_probe(struct xenbus_device *dev, const struct xenbus_device_id *id) { - int ret, i, abs; + int ret, i; + unsigned int abs; struct xenkbd_info *info; struct input_dev *kbd, *ptr; @@ -127,8 +128,7 @@ static int xenkbd_probe(struct xenbus_device *dev, if (!info->page) goto error_nomem; - if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-abs-pointer", "%d", &abs) < 0) - abs = 0; + abs = xenbus_read_unsigned(dev->otherend, "feature-abs-pointer", 0); if (abs) { ret = xenbus_write(XBT_NIL, dev->nodename, "request-abs-pointer", "1"); @@ -322,11 +322,8 @@ 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) { + if (xenbus_read_unsigned(info->xbdev->otherend, + "feature-abs-pointer", 0)) { ret = xenbus_write(XBT_NIL, info->xbdev->nodename, "request-abs-pointer", "1"); if (ret) -- 2.20.1