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Date: Tue, 11 Jun 2024 14:55:24 +0000
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Message-ID: <20240611145524.1022656-1-joychakr@google.com>
Subject: [PATCH] nvmem: meson-efuse: Fix return value of nvmem callbacks
From: Joy Chakraborty <joychakr@google.com>
To: Jerome Brunet <jbrunet@baylibre.com>, 
	Martin Blumenstingl <martin.blumenstingl@googlemail.com>, 
	Srinivas Kandagatla <srinivas.kandagatla@linaro.org>, 
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Dan Carpenter <dan.carpenter@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, 
	linux-kernel@vger.kernel.org, Joy Chakraborty <joychakr@google.com>, stable@vger.kernel.org
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Read/write callbacks registered with nvmem core expect 0 to be returned
on success and a negative value to be returned on failure.

meson_efuse_read() and meson_efuse_write() call into
meson_sm_call_read() and meson_sm_call_write() respectively which return
the number of bytes read or written on success as per their api
description.

Fix to return error if meson_sm_call_read()/meson_sm_call_write()
returns an error else return 0.

Fixes: a29a63bdaf6f ("nvmem: meson-efuse: simplify read callback")
Cc: stable@vger.kernel.org
Signed-off-by: Joy Chakraborty <joychakr@google.com>
---
 drivers/nvmem/meson-efuse.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/nvmem/meson-efuse.c b/drivers/nvmem/meson-efuse.c
index 52ed9a62ca5b..d7f9ac99a212 100644
--- a/drivers/nvmem/meson-efuse.c
+++ b/drivers/nvmem/meson-efuse.c
@@ -18,18 +18,24 @@ static int meson_efuse_read(void *context, unsigned int offset,
 			    void *val, size_t bytes)
 {
 	struct meson_sm_firmware *fw = context;
+	int ret;
 
-	return meson_sm_call_read(fw, (u8 *)val, bytes, SM_EFUSE_READ, offset,
-				  bytes, 0, 0, 0);
+	ret = meson_sm_call_read(fw, (u8 *)val, bytes, SM_EFUSE_READ, offset,
+				 bytes, 0, 0, 0);
+
+	return ret < 0 ? ret : 0;
 }
 
 static int meson_efuse_write(void *context, unsigned int offset,
 			     void *val, size_t bytes)
 {
 	struct meson_sm_firmware *fw = context;
+	int ret;
+
+	ret = meson_sm_call_write(fw, (u8 *)val, bytes, SM_EFUSE_WRITE, offset,
+				  bytes, 0, 0, 0);
 
-	return meson_sm_call_write(fw, (u8 *)val, bytes, SM_EFUSE_WRITE, offset,
-				   bytes, 0, 0, 0);
+	return ret < 0 ? ret : 0;
 }
 
 static const struct of_device_id meson_efuse_match[] = {
-- 
2.45.2.505.gda0bf45e8d-goog