From: Jiada Wang <jiada_wang@mentor.com>
To: <lgirdwood@gmail.com>, <broonie@kernel.org>, <perex@perex.cz>,
<tiwai@suse.com>, <kuninori.morimoto.gx@renesas.com>
Cc: <alsa-devel@alsa-project.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH linux-next v1 1/2] ASoC: rsnd: src: Avoid a potential deadlock
Date: Thu, 7 Mar 2019 11:34:52 +0900 [thread overview]
Message-ID: <20190307023453.25017-2-jiada_wang@mentor.com> (raw)
In-Reply-To: <20190307023453.25017-1-jiada_wang@mentor.com>
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_wang@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
next prev parent reply other threads:[~2019-03-07 2:35 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-07 2:34 [PATCH linux-next v1 0/2] misc fix in src.c Jiada Wang
2019-03-07 2:34 ` Jiada Wang [this message]
2019-03-07 2:47 ` [PATCH linux-next v1 1/2] ASoC: rsnd: src: Avoid a potential deadlock Kuninori Morimoto
2019-03-07 2:34 ` [PATCH linux-next v1 2/2] ASoC: rsnd: src: fix compiler warnings Jiada Wang
2019-03-07 2:48 ` Kuninori Morimoto
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