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infra: fix silly deadlock on improbable race

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Thomas Schoebel-Theuer 2018-05-09 07:51:21 +02:00
parent fb6db64faa
commit 988457b65b
1 changed files with 2 additions and 3 deletions
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5
kernel/brick_say.c
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@ -451,16 +451,15 @@ struct say_channel *make_channel(const char *name, bool must_exist)
for (ch = channel_list; ch; ch = ch->ch_next) {
if (ch != res && unlikely(!strcmp(ch->ch_name, name))) {
up_write(&say_mutex);
_del_channel(res);
res = ch;
goto race_found;
goto done;
}
}
res->ch_next = channel_list;
channel_list = res;
race_found:
up_write(&say_mutex);
}