4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jan Beulich <JBeulich@xxxxxxxx>
[ Upstream commit 4fed1b125eb6252bde478665fc05d4819f774fa8 ]
A negative return value indicates an error; in fact the function at
present won't ever return zero.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/xen/manage.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/xen/manage.c
+++ b/drivers/xen/manage.c
@@ -275,7 +275,7 @@ static void sysrq_handler(struct xenbus_
err = xenbus_transaction_start(&xbt);
if (err)
return;
- if (!xenbus_scanf(xbt, "control", "sysrq", "%c", &sysrq_key)) {
+ if (xenbus_scanf(xbt, "control", "sysrq", "%c", &sysrq_key) < 0) {
pr_err("Unable to read sysrq code in control/sysrq\n");
xenbus_transaction_end(xbt, 1);
return;