chardev: use per-dev context for io_add_watch_poll
It was only passed in by chr_update_read_handlers(). However when reconnect, we'll lose that context information. So if a chardev was running on another context (rather than the default context, the NULL pointer), it'll switch back to the default context if reconnection happens. But, it should really stick to the old context. Convert all the callers of io_add_watch_poll() to use the internally cached gcontext. Then the context should be able to survive even after reconnections. Signed-off-by: NPeter Xu <peterx@redhat.com> Message-Id: <1505975754-21555-4-git-send-email-peterx@redhat.com> Reviewed-by: NMarc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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