[PATCH linux-next v1 1/2] ASoC: rsnd: src: Avoid a potential deadlock

[Jiada Wang]

lockdep warns us that priv->lock and k->k_lock can cause a
deadlock when after acquire of k->k_lock, process is interrupted
by src, while in another routine of src .init, k->k_lock is
acquired with priv->lock held.

This patch avoids a potential deadlock by not calling soc_device_match()
in SRC .init callback, instead it adds new soc fields in priv->flags to
differentiate SoCs.

Fixes: linux-next commit 7674bec4fc09 ("ASoC: rsnd: update BSDSR/BSDISR 
handling")
Signed-off-by: Jiada Wang <jiada_w...@mentor.com>
---
 sound/soc/sh/rcar/core.c | 3 +++
 sound/soc/sh/rcar/rsnd.h | 5 +++++
 sound/soc/sh/rcar/src.c  | 9 +--------
 3 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/sound/soc/sh/rcar/core.c b/sound/soc/sh/rcar/core.c
index 022996d2db13..c2d466fe191f 100644
--- a/sound/soc/sh/rcar/core.c
+++ b/sound/soc/sh/rcar/core.c
@@ -1680,6 +1680,7 @@ static int rsnd_rdai_continuance_probe(struct rsnd_priv 
*priv,
 static int rsnd_probe(struct platform_device *pdev)
 {
        struct rsnd_priv *priv;
+       struct device_node *np = pdev->dev.of_node;
        struct device *dev = &pdev->dev;
        struct rsnd_dai *rdai;
        int (*probe_func[])(struct rsnd_priv *priv) = {
@@ -1706,6 +1707,8 @@ static int rsnd_probe(struct platform_device *pdev)
 
        priv->pdev      = pdev;
        priv->flags     = (unsigned long)of_device_get_match_data(dev);
+       if (of_device_is_compatible(np, "renesas,rcar_sound-r8a77990"))
+               priv->flags |= RSND_SOC_E;
        spin_lock_init(&priv->lock);
 
        /*
diff --git a/sound/soc/sh/rcar/rsnd.h b/sound/soc/sh/rcar/rsnd.h
index 90625c57847b..0e6ef4e18400 100644
--- a/sound/soc/sh/rcar/rsnd.h
+++ b/sound/soc/sh/rcar/rsnd.h
@@ -607,6 +607,8 @@ struct rsnd_priv {
 #define RSND_GEN1      (1 << 0)
 #define RSND_GEN2      (2 << 0)
 #define RSND_GEN3      (3 << 0)
+#define RSND_SOC_MASK  (0xFF << 4)
+#define RSND_SOC_E     (1 << 4) /* E1/E2/E3 */
 
        /*
         * below value will be filled on rsnd_gen_probe()
@@ -679,6 +681,9 @@ struct rsnd_priv {
 #define rsnd_is_gen1(priv)     (((priv)->flags & RSND_GEN_MASK) == RSND_GEN1)
 #define rsnd_is_gen2(priv)     (((priv)->flags & RSND_GEN_MASK) == RSND_GEN2)
 #define rsnd_is_gen3(priv)     (((priv)->flags & RSND_GEN_MASK) == RSND_GEN3)
+#define rsnd_is_e3(priv)       (((priv)->flags & \
+                                       (RSND_GEN_MASK | RSND_SOC_MASK)) == \
+                                       (RSND_GEN3 | RSND_SOC_E))
 
 #define rsnd_flags_has(p, f) ((p)->flags & (f))
 #define rsnd_flags_set(p, f) ((p)->flags |= (f))
diff --git a/sound/soc/sh/rcar/src.c b/sound/soc/sh/rcar/src.c
index db81e066b92e..45096a66c074 100644
--- a/sound/soc/sh/rcar/src.c
+++ b/sound/soc/sh/rcar/src.c
@@ -14,7 +14,6 @@
  */
 
 #include "rsnd.h"
-#include <linux/sys_soc.h>
 
 #define SRC_NAME "src"
 
@@ -189,18 +188,12 @@ const static u32 chan222222[] = {
        0x00000006, /* 1 to 2 */
 };
 
-static const struct soc_device_attribute ov_soc[] = {
-       { .soc_id = "r8a77990" }, /* E3 */
-       { /* sentinel */ }
-};
-
 static void rsnd_src_set_convert_rate(struct rsnd_dai_stream *io,
                                      struct rsnd_mod *mod)
 {
        struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
        struct device *dev = rsnd_priv_to_dev(priv);
        struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
-       const struct soc_device_attribute *soc = soc_device_match(ov_soc);
        int is_play = rsnd_io_is_play(io);
        int use_src = 0;
        u32 fin, fout;
@@ -307,7 +300,7 @@ static void rsnd_src_set_convert_rate(struct 
rsnd_dai_stream *io,
        /*
         * E3 need to overwrite
         */
-       if (soc)
+       if (rsnd_is_e3(priv))
                switch (rsnd_mod_id(mod)) {
                case 0:
                case 4:
-- 
2.19.2