ASoC: rsnd: remove NULL check from rsnd_mod_name()/rsnd_mod_id()

Current rsnd driver has rsnd_mod_id() which returns mod ID,
and it returns -1 if mod was NULL.
In the same time, this driver has rsnd_mod_name() which returns mod
name, and it returns "unknown" if mod or mod->ops was NULL.

Basically these "mod" never be NULL, but the reason why rsnd driver
has such behavior is that DMA path finder is assuming memory as
"mod == NULL".
Thus, current DMA path debug code prints like below.
Here "unknown[-1]" means it was memory.

	...
	rcar_sound ec500000.sound:   unknown[-1] from
	rcar_sound ec500000.sound:   src[0] to
	rcar_sound ec500000.sound:   ctu[2]
	rcar_sound ec500000.sound:   mix[0]
	rcar_sound ec500000.sound:   dvc[0]
	rcar_sound ec500000.sound:   ssi[0]
	rcar_sound ec500000.sound: audmac[0] unknown[-1] -> src[0]
	...

1st issue is that it is confusable for user.
2nd issue is rsnd driver has something like below code.

	mask |= 1 << rsnd_mod_id(mod);

Because of this kind of code, some statically code checker will
reports "Shifting by a negative value is undefined behaviour".

But this "mod" never be NULL, thus negative shift never happen.
To avoid these issues, this patch adds new dummy "mem" to
indicate memory, and use it to indicate debug information,
and, remove unneeded "NULL mod" behavior from rsnd_mod_id() and
rsnd_mod_name().

The debug information will be like below by this patch
	...
	rcar_sound ec500000.sound:   mem[0] from
	rcar_sound ec500000.sound:   src[0] to
	rcar_sound ec500000.sound:   ctu[2]
	rcar_sound ec500000.sound:   mix[0]
	rcar_sound ec500000.sound:   dvc[0]
	rcar_sound ec500000.sound:   ssi[0]
	rcar_sound ec500000.sound: audmac[0] mem[0] -> src[0]
	...

Reported-by: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 18 insertions, 6 deletions

diff --git a/sound/soc/sh/rcar/dma.c b/sound/soc/sh/rcar/dma.c
index 17220c9..5bc9ec1 100644
--- a/sound/soc/sh/rcar/dma.c
+++ b/sound/soc/sh/rcar/dma.c
@@ -60,6 +60,14 @@ struct rsnd_dma_ctrl {
 #define rsnd_dma_to_dmaen(dma)	(&(dma)->dma.en)
 #define rsnd_dma_to_dmapp(dma)	(&(dma)->dma.pp)
 
+/* for DEBUG */
+static struct rsnd_mod_ops mem_ops = {
+	.name = "mem",
+};
+
+static struct rsnd_mod mem = {
+};
+
 /*
  *		Audio DMAC
  */
@@ -747,9 +755,10 @@ static void rsnd_dma_of_path(struct rsnd_mod *this,
 		rsnd_mod_name(this), rsnd_mod_id(this));
 	for (i = 0; i <= idx; i++) {
 		dev_dbg(dev, "  %s[%d]%s\n",
-		       rsnd_mod_name(mod[i]), rsnd_mod_id(mod[i]),
-		       (mod[i] == *mod_from) ? " from" :
-		       (mod[i] == *mod_to)   ? " to" : "");
+			rsnd_mod_name(mod[i] ? mod[i] : &mem),
+			rsnd_mod_id  (mod[i] ? mod[i] : &mem),
+			(mod[i] == *mod_from) ? " from" :
+			(mod[i] == *mod_to)   ? " to" : "");
 	}
 }
 
@@ -814,8 +823,10 @@ static int rsnd_dma_alloc(struct rsnd_dai_stream *io, struct rsnd_mod *mod,
 
 	dev_dbg(dev, "%s[%d] %s[%d] -> %s[%d]\n",
 		rsnd_mod_name(*dma_mod), rsnd_mod_id(*dma_mod),
-		rsnd_mod_name(mod_from), rsnd_mod_id(mod_from),
-		rsnd_mod_name(mod_to),   rsnd_mod_id(mod_to));
+		rsnd_mod_name(mod_from ? mod_from : &mem),
+		rsnd_mod_id  (mod_from ? mod_from : &mem),
+		rsnd_mod_name(mod_to   ? mod_to   : &mem),
+		rsnd_mod_id  (mod_to   ? mod_to   : &mem));
 
 	ret = attach(io, dma, mod_from, mod_to);
 	if (ret < 0)
@@ -872,5 +883,6 @@ int rsnd_dma_probe(struct rsnd_priv *priv)
 
 	priv->dma = dmac;
 
-	return 0;
+	/* dummy mem mod for debug */
+	return rsnd_mod_init(NULL, &mem, &mem_ops, NULL, NULL, 0, 0);
 }