migration/migration.c: Fix hang in ram_save_host_page

Git-commit: 773861274ad75a62c7ecf70ecc8e4ba31ed62190
References: bsc#1185591

migration_rate_limit will erroneously ratelimit a shutdown socket,
which causes the migration thread to hang in ram_save_host_page
if the socket is shutdown.

Fix this by explicitly testing if the socket has errors or was
shutdown in migration_rate_limit.

Signed-off-by: Lukas Straub <lukasstraub2@web.de>
Message-Id: <e79085bbe2d46dfa007dd41820194d5e2d4fcd80.1590007004.git.lukasstraub2@web.de>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
(cherry picked from commit 773861274ad75a62c7ecf70ecc8e4ba31ed62190)
Signed-off-by: Lin Ma <lma@suse.com>

diff --git a/migration/migration.c b/migration/migration.c
index 27500d09a94a8615c935245e23ed979497879205..eecb9b54f90b155d20f007290b4424d65197b8f0 100644 (file)
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -3233,6 +3233,10 @@ bool migration_rate_limit(void)
     bool urgent = false;
     migration_update_counters(s, now);
     if (qemu_file_rate_limit(s->to_dst_file)) {
+
+        if (qemu_file_get_error(s->to_dst_file)) {
+            return false;
+        }
         /*
          * Wait for a delay to do rate limiting OR
          * something urgent to post the semaphore.