Re: [Qemu-devel] [PATCH] do not call monitor_resume() from migrate_fd_put_buffer() error path

[Jan Kiszka <jan.kiszka@web.de>]

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On 2011-07-19 13:46, Michael Tokarev wrote:
> If we do, it results in double monitor_resume() (second being called
> from migrate_fd_cleanup() anyway) and monitor suspend count becoming
> negative.
> 
> Cc'ing people from `git blame' list for the lines in question: the
> change fixes the problem but I'm not sure what the original intention
> of this code was in this place.  Unfortunately noone replied to two
> my attempts to raise this issue.
> 
> Signed-Off-By: Michael Tokarev <mjt@tls.msk.ru>
> ---
>  migration.c |    3 ---
>  1 files changed, 0 insertions(+), 3 deletions(-)
> 
> diff --git a/migration.c b/migration.c
> index af3a1f2..115588c 100644
> --- a/migration.c
> +++ b/migration.c
> @@ -330,9 +330,6 @@ ssize_t migrate_fd_put_buffer(void *opaque, const void *data, size_t size)
>      if (ret == -EAGAIN) {
>          qemu_set_fd_handler2(s->fd, NULL, NULL, migrate_fd_put_notify, s);
>      } else if (ret < 0) {
> -        if (s->mon) {
> -            monitor_resume(s->mon);
> -        }
>          s->state = MIG_STATE_ERROR;
>          notifier_list_notify(&migration_state_notifiers);
>      }

Looks reasonable to me, but Marcelo should comment on this, specifically
which scenario once required the resume.

Jan


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