xen: don't print error message in case of missing Xenstore entry

[karo-tx-linux.git] / drivers / xen / manage.c

diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
index c1ec8ee80924837914ecc0fb2f3ca09cfd00bbcc..60cf71f1b2562893e83b223470d0e2e47fab55fb 100644 (file)
--- a/drivers/xen/manage.c
+++ b/drivers/xen/manage.c
@@ -277,8 +277,16 @@ static void sysrq_handler(struct xenbus_watch *watch, const char *path,
        err = xenbus_transaction_start(&xbt);
        if (err)
                return;
-       if (xenbus_scanf(xbt, "control", "sysrq", "%c", &sysrq_key) < 0) {
-               pr_err("Unable to read sysrq code in control/sysrq\n");
+       err = xenbus_scanf(xbt, "control", "sysrq", "%c", &sysrq_key);
+       if (err < 0) {
+               /*
+                * The Xenstore watch fires directly after registering it and
+                * after a suspend/resume cycle. So ENOENT is no error but
+                * might happen in those cases.
+                */
+               if (err != -ENOENT)
+                       pr_err("Error %d reading sysrq code in control/sysrq\n",
+                              err);
                xenbus_transaction_end(xbt, 1);
                return;
        }