linux-kernel - [PATCH] sound: soc: uniphier: Handle regmap_write errors in aio_src_set

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Message-ID:
 <SE1P216MB2287F4D575CFBDC9755E896BFD6A2@SE1P216MB2287.KORP216.PROD.OUTLOOK.COM>
Date: Thu, 26 Sep 2024 21:15:18 +0000
From: (학생) 장인규 (컴퓨터공학과)
	<ingyujang25@...st.ac.kr>
To: "perex@...ex.cz" <perex@...ex.cz>, "tiwai@...e.com" <tiwai@...e.com>,
	"hayashi.kunihiko@...ionext.com" <hayashi.kunihiko@...ionext.com>,
	"mhiramat@...nel.org" <mhiramat@...nel.org>
CC: "lgirdwood@...il.com" <lgirdwood@...il.com>, "broonie@...nel.org"
	<broonie@...nel.org>, "alsa-devel@...a-project.org"
	<alsa-devel@...a-project.org>, "linux-sound@...r.kernel.org"
	<linux-sound@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: [PATCH] sound: soc: uniphier: Handle regmap_write errors in
 aio_src_set_param()

From 791716bf359b8540c519810848fd1f8006d7c3c5 Mon Sep 17 00:00:00 2001
From: Ingyu Jang <ingyujang25@...st.ac.kr>
Date: Thu, 26 Sep 2024 19:40:04 +0900
Subject: [PATCH] sound: soc: uniphier: Handle regmap_write errors in
 aio_src_set_param()

The aio_src_set_param() function did not previously check the return
values of regmap_write() and regmap_update_bits().
If these functions fail, it could lead to silent failures when
configuring the sample rate converter (SRC), causing improper behavior
in audio processing without any indication of an error.

This patch modifies aio_src_set_param to check the return values of
regmap_write() and regmap_update_bits().
If either function returns an error, the error code is propagated back
to the caller to ensure proper error handling.
This change aligns with the existing error-handling behavior in
functions like uniphier_aio_prepare(), where a failure in a sub-function
should result in an immediate return of the error.

Signed-off-by: Ingyu Jang <ingyujang25@...st.ac.kr>
---
 sound/soc/uniphier/aio-core.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/sound/soc/uniphier/aio-core.c b/sound/soc/uniphier/aio-core.c
index 0eba60758134..2c4e8b873253 100644
--- a/sound/soc/uniphier/aio-core.c
+++ b/sound/soc/uniphier/aio-core.c
@@ -921,16 +921,19 @@ int aio_src_set_param(struct uniphier_aio_sub *sub,
 {
 	struct regmap *r = sub->aio->chip->regmap;
 	u32 v;
+	int ret;
 
 	if (sub->swm->dir != PORT_DIR_OUTPUT)
 		return 0;
 
-	regmap_write(r, OPORTMXSRC1CTR(sub->swm->oport.map),
+	ret = regmap_write(r, OPORTMXSRC1CTR(sub->swm->oport.map),
 		     OPORTMXSRC1CTR_THMODE_SRC |
 		     OPORTMXSRC1CTR_SRCPATH_CALC |
 		     OPORTMXSRC1CTR_SYNC_ASYNC |
 		     OPORTMXSRC1CTR_FSIIPSEL_INNER |
 		     OPORTMXSRC1CTR_FSISEL_ACLK);
+	if (ret)
+		return ret;
 
 	switch (params_rate(params)) {
 	default:
@@ -951,12 +954,18 @@ int aio_src_set_param(struct uniphier_aio_sub *sub,
 		break;
 	}
 
-	regmap_write(r, OPORTMXRATE_I(sub->swm->oport.map),
+
+	ret = regmap_write(r, OPORTMXRATE_I(sub->swm->oport.map),
 		     v | OPORTMXRATE_I_ACLKSRC_APLL |
 		     OPORTMXRATE_I_LRCKSTP_STOP);
-	regmap_update_bits(r, OPORTMXRATE_I(sub->swm->oport.map),
+	if (ret)
+		return ret;
+
+	ret = regmap_update_bits(r, OPORTMXRATE_I(sub->swm->oport.map),
 			   OPORTMXRATE_I_LRCKSTP_MASK,
 			   OPORTMXRATE_I_LRCKSTP_START);
+	if (ret)
+		return ret;
 
 	return 0;
 }
-- 
2.34.1