Author: royger
Date: Thu May 28 08:20:16 2020
New Revision: 361580
URL: https://svnweb.freebsd.org/changeset/base/361580
Log:
xen/control: short circuit xctrl_on_watch_event on spurious event
If there's no data to read from xenstore short-circuit
xctrl_on_watch_event to return early, there's no reason to continue
since the lack of data would prevent matching against any known event
type.
Sponsored by: Citrix Systems R&D
MFC with: r352925
MFC after: 1 week
Modified:
head/sys/dev/xen/control/control.c
Modified: head/sys/dev/xen/control/control.c
==============================================================================
--- head/sys/dev/xen/control/control.c Thu May 28 08:19:13 2020
(r361579)
+++ head/sys/dev/xen/control/control.c Thu May 28 08:20:16 2020
(r361580)
@@ -360,7 +360,7 @@ xctrl_on_watch_event(struct xs_watch *watch, const cha
error = xs_read(XST_NIL, "control", "shutdown",
&result_len, (void **)&result);
- if (error != 0)
+ if (error != 0 || result_len == 0)
return;
/* Acknowledge the request by writing back an empty string. */
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