ASoC: topology: fix soc_tplg_fe_link_create() - link->dobj initialization order

The code which checks the return value for snd_soc_add_dai_link() call
in soc_tplg_fe_link_create() moved the snd_soc_add_dai_link() call before
link->dobj members initialization.

While it does not affect the latest kernels, the old soc-core.c code
in the stable kernels is affected. The snd_soc_add_dai_link() function uses
the link->dobj.type member to check, if the link structure is valid.

Reorder the link->dobj initialization to make things work again.
It's harmless for the recent code (and the structure should be properly
initialized before other calls anyway).

The problem is in stable linux-5.4.y since version 5.4.11 when the
upstream commit 76d270364932 was applied.

Fixes: 76d270364932 ("ASoC: topology: Check return value for snd_soc_add_dai_link()")
Cc: Dragos Tarcatu <dragos_tarcatu@mentor.com>
Cc: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Cc: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20200122190752.3081016-1-perex@perex.cz
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c
index 92e4f4d08bfad6b7ff9e9904eac0fac7f98f8bd9..4e1fe623c39086fdc40bce94bf65825b635abe18 100644 (file)
--- a/sound/soc/soc-topology.c
+++ b/sound/soc/soc-topology.c
@@ -1906,6 +1906,10 @@ static int soc_tplg_fe_link_create(struct soc_tplg *tplg,
        link->num_codecs = 1;
        link->num_platforms = 1;
 
+       link->dobj.index = tplg->index;
+       link->dobj.ops = tplg->ops;
+       link->dobj.type = SND_SOC_DOBJ_DAI_LINK;
+
        if (strlen(pcm->pcm_name)) {
                link->name = kstrdup(pcm->pcm_name, GFP_KERNEL);
                link->stream_name = kstrdup(pcm->pcm_name, GFP_KERNEL);
@@ -1942,9 +1946,6 @@ static int soc_tplg_fe_link_create(struct soc_tplg *tplg,
                goto err;
        }
 
-       link->dobj.index = tplg->index;
-       link->dobj.ops = tplg->ops;
-       link->dobj.type = SND_SOC_DOBJ_DAI_LINK;
        list_add(&link->dobj.list, &tplg->comp->dobj_list);
 
        return 0;