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authorJuergen Gross <jgross@suse.com>2017-05-30 21:52:26 +0300
committerJuergen Gross <jgross@suse.com>2017-06-07 10:48:02 +0300
commit4e93b6481c87ea5afde944a32b4908357ec58992 (patch)
tree17863013d8ff01ae30710a19016f2124a1d4588d /drivers/xen/manage.c
parent84a0a967a44b9da6c5effff628aafa7698050574 (diff)
downloadlinux-4e93b6481c87ea5afde944a32b4908357ec58992.tar.xz
xen: don't print error message in case of missing Xenstore entry
When registering for the Xenstore watch of the node control/sysrq the handler will be called at once. Don't issue an error message if the Xenstore node isn't there, as it will be created only when an event is being triggered. Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'drivers/xen/manage.c')
-rw-r--r--drivers/xen/manage.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
index c1ec8ee80924..60cf71f1b256 100644
--- 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;
}