plug: Move fast_ops copy after slave configuration.

The plug plugin copies the fast_ops structure and fast_op_arg from its slave PCM on initialization and after inserting a new plugin. This works unless the slave PCM is also an instance of the plug plugin because plug can change its fast_ops structure during _snd_pcm_hw_params.

Instead of copying fast_ops in snd_pcm_plug_insert_plugins wait until the end of snd_pcm_plug_hw_params when the slave has been fully initialized.

This fixes a crash when two instances of plug are instantiated back to back and the format conversion plugin inserted by the second is skipped by the first because the fast_ops pointer is not properly updated.

---
 src/pcm/pcm_plug.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

index e9d2923..72456d5 100644
@@ -659,8 +659,6 @@ static int snd_pcm_plug_insert_plugins(snd_pcm_t *pcm,
 		}
 		if (err) {
 			plug->gen.slave = new;
-			pcm->fast_ops = new->fast_ops;
-			pcm->fast_op_arg = new->fast_op_arg;
 		}
 		k++;
 	}

@@ -1049,6 +1047,9 @@ static int snd_pcm_plug_hw_params(snd_pcm_t *pcm,

snd_pcm_hw_params_t *params)
}
snd_pcm_unlink_hw_ptr(pcm, plug->req_slave); snd_pcm_unlink_appl_ptr(pcm, plug->req_slave);
+
+ pcm->fast_ops = slave->fast_ops;
+ pcm->fast_op_arg = slave->fast_op_arg;
snd_pcm_link_hw_ptr(pcm, slave); snd_pcm_link_appl_ptr(pcm, slave); return 0;

1.7.3.4