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Re: [Ping][PATCH v0] vl: flush all task from rcu queue before exiting
From: |
Paolo Bonzini |
Subject: |
Re: [Ping][PATCH v0] vl: flush all task from rcu queue before exiting |
Date: |
Tue, 9 Nov 2021 18:46:20 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0 |
On 11/9/21 08:23, Denis Plotnikov wrote:
Ping ping!
Looks good, but can you explain why it's okay to call it before
qemu_chr_cleanup() and user_creatable_cleanup()?
I think a better solution to the ordering problem would be:
qemu_chr_cleanup();
user_creatable_cleanup();
flush_rcu();
monitor_cleanup();
with something like this:
diff --git a/chardev/char-fe.c b/chardev/char-fe.c
index 7789f7be9c..f0c3ea5447 100644
--- a/chardev/char-fe.c
+++ b/chardev/char-fe.c
@@ -195,6 +195,7 @@ bool qemu_chr_fe_init(CharBackend *b,
int tag = 0;
if (s) {
+ object_ref(OBJECT(s));
if (CHARDEV_IS_MUX(s)) {
MuxChardev *d = MUX_CHARDEV(s);
@@ -241,6 +242,7 @@ void qemu_chr_fe_deinit(CharBackend *b, bool del)
} else {
object_unref(obj);
}
+ object_unref(obj);
}
b->chr = NULL;
}
to keep the chardev live between qemu_chr_cleanup() and monitor_cleanup().
Paolo