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Commit 4e93b648 authored by Juergen Gross's avatar Juergen Gross
Browse files

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: default avatarJuergen Gross <jgross@suse.com>
Reviewed-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
parent 84a0a967

drivers/xen/manage.c

+10 −2
Original line number Diff line number Diff line
@@ -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;

	}