Re: [Qemu-devel] [PATCH v9 03/12] migration: Make migrate_fd_error() the owner of the Error

[Peter Xu <peterx@redhat.com>]

On Wed, Oct 04, 2017 at 12:46:27PM +0200, Juan Quintela wrote:
> So far, we had to free the error after each caller, so just do it
> here.  Once there, tls.c was leaking the error.

Ah I see the point of my previous question... I think the tls.c leak
was introduced by previous patch?  Shall we squash that line into this
patch instead?

After that, these two patches both look good to me.  Thanks,

> 
> Signed-off-by: Juan Quintela <quintela@redhat.com>
> ---
>  migration/channel.c   |  1 -
>  migration/migration.c | 10 ++++------
>  migration/migration.h |  4 ++--
>  migration/socket.c    |  1 -
>  4 files changed, 6 insertions(+), 10 deletions(-)
> 
> diff --git a/migration/channel.c b/migration/channel.c
> index 70ec7ea3b7..1dd2ae1530 100644
> --- a/migration/channel.c
> +++ b/migration/channel.c
> @@ -71,7 +71,6 @@ void migration_channel_connect(MigrationState *s,
>          migration_tls_channel_connect(s, ioc, hostname, &local_err);
>          if (local_err) {
>              migrate_fd_error(s, local_err);
> -            error_free(local_err);
>          }
>      } else {
>          QEMUFile *f = qemu_fopen_channel_output(ioc);
> diff --git a/migration/migration.c b/migration/migration.c
> index 468f51cfa7..61b7e7105a 100644
> --- a/migration/migration.c
> +++ b/migration/migration.c
> @@ -1079,16 +1079,14 @@ static void migrate_fd_cleanup(void *opaque)
>      block_cleanup_parameters(s);
>  }
>  
> -void migrate_set_error(MigrationState *s, const Error *error)
> +void migrate_set_error(MigrationState *s, Error *error)
>  {
>      qemu_mutex_lock(&s->error_mutex);
> -    if (!s->error) {
> -        s->error = error_copy(error);
> -    }
> +    error_propagate(&s->error, error);
>      qemu_mutex_unlock(&s->error_mutex);
>  }
>  
> -void migrate_fd_error(MigrationState *s, const Error *error)
> +void migrate_fd_error(MigrationState *s, Error *error)
>  {
>      trace_migrate_fd_error(error_get_pretty(error));
>      assert(s->to_dst_file == NULL);
> @@ -1362,7 +1360,7 @@ void qmp_migrate(const char *uri, bool has_blk, bool blk,
>      }
>  
>      if (local_err) {
> -        migrate_fd_error(s, local_err);
> +        migrate_fd_error(s, error_copy(local_err));
>          error_propagate(errp, local_err);
>          return;
>      }
> diff --git a/migration/migration.h b/migration/migration.h
> index 51c0ac2e71..cc196cc87f 100644
> --- a/migration/migration.h
> +++ b/migration/migration.h
> @@ -163,8 +163,8 @@ bool  migration_has_all_channels(void);
>  
>  uint64_t migrate_max_downtime(void);
>  
> -void migrate_set_error(MigrationState *s, const Error *error);
> -void migrate_fd_error(MigrationState *s, const Error *error);
> +void migrate_set_error(MigrationState *s, Error *error);
> +void migrate_fd_error(MigrationState *s, Error *error);
>  
>  void migrate_fd_connect(MigrationState *s);
>  
> diff --git a/migration/socket.c b/migration/socket.c
> index dee869044a..2d70747a1a 100644
> --- a/migration/socket.c
> +++ b/migration/socket.c
> @@ -80,7 +80,6 @@ static void socket_outgoing_migration(QIOTask *task,
>      if (qio_task_propagate_error(task, &err)) {
>          trace_migration_socket_outgoing_error(error_get_pretty(err));
>          migrate_fd_error(data->s, err);
> -        error_free(err);
>      } else {
>          trace_migration_socket_outgoing_connected(data->hostname);
>          migration_channel_connect(data->s, sioc, data->hostname);
> -- 
> 2.13.5
> 

-- 
Peter Xu