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commit 22b626e28e9895cc65c1e2023323bda5138716dc
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Author: Gerd Hoffmann <kraxel@redhat.com>
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Date: Fri Sep 2 15:03:28 2011 +0200
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spice: workaround a spice server bug.
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spice server might call the channel_event callback from spice server
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thread context. Detect that and aquire iothread lock if needed,
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diff --git a/ui/spice-core.c b/ui/spice-core.c
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index dba11f0..3cbc721 100644
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--- a/ui/spice-core.c
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+++ b/ui/spice-core.c
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@@ -19,6 +19,7 @@
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#include <spice-experimental.h>
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#include <netdb.h>
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+#include <pthread.h>
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#include "qemu-common.h"
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#include "qemu-spice.h"
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@@ -44,6 +45,8 @@ static char *auth_passwd;
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static time_t auth_expires = TIME_MAX;
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int using_spice = 0;
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+static pthread_t me;
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+
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struct SpiceTimer {
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QEMUTimer *timer;
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QTAILQ_ENTRY(SpiceTimer) next;
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@@ -217,6 +220,20 @@ static void channel_event(int event, SpiceChannelEventInfo *info)
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QDict *server, *client;
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QObject *data;
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+ /*
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+ * Spice server might have called us from spice worker thread
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+ * context (happens on display channel disconnects). Spice should
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+ * not do that. It isn't that easy to fix it in spice and even
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+ * when it is fixed we still should cover the already released
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+ * spice versions. So detect that we've been called from another
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+ * thread and grab the iothread lock if so before calling qemu
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+ * functions.
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+ */
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+ bool need_lock = !pthread_equal(me, pthread_self());
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+ if (need_lock) {
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+ qemu_mutex_lock_iothread();
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+ }
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+
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client = qdict_new();
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add_addr_info(client, &info->paddr, info->plen);
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@@ -236,6 +253,10 @@ static void channel_event(int event, SpiceChannelEventInfo *info)
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QOBJECT(client), QOBJECT(server));
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monitor_protocol_event(qevent[event], data);
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qobject_decref(data);
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+
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+ if (need_lock) {
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+ qemu_mutex_unlock_iothread();
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+ }
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}
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#else /* SPICE_INTERFACE_CORE_MINOR >= 3 */
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@@ -482,7 +503,9 @@ void qemu_spice_init(void)
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spice_image_compression_t compression;
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spice_wan_compression_t wan_compr;
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- if (!opts) {
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+ me = pthread_self();
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+
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+ if (!opts) {
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return;
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}
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port = qemu_opt_get_number(opts, "port", 0);
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