linux-kernel - [PATCH v4 2/3] soc: qcom: fix QMI encoding/decoding for basic elements

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Message-ID: <20250922061549.11407-3-alexander.wilhelm@westermo.com>
Date: Mon, 22 Sep 2025 08:15:45 +0200
From: Alexander Wilhelm <alexander.wilhelm@...termo.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 2/3] soc: qcom: fix QMI encoding/decoding for basic elements

Extend the QMI byte encoding and decoding logic to support multiple basic
data type sizes (u8, u16, u32, u64) using existing macros. Ensure correct
handling of data sizes and proper byte order conversion on big-endian
platforms by consistently applying these macros during encoding and
decoding of basic elements.

Signed-off-by: Alexander Wilhelm <alexander.wilhelm@...termo.com>
---
 drivers/soc/qcom/qmi_encdec.c | 46 +++++++++++++++++++++++------------
 1 file changed, 30 insertions(+), 16 deletions(-)

diff --git a/drivers/soc/qcom/qmi_encdec.c b/drivers/soc/qcom/qmi_encdec.c
index 1f9091458d72..90a48fa7ecf4 100644
--- a/drivers/soc/qcom/qmi_encdec.c
+++ b/drivers/soc/qcom/qmi_encdec.c
@@ -23,13 +23,6 @@
 	*p_length |= ((u8)*p_src) << 8; \
 } while (0)
 
-#define QMI_ENCDEC_ENCODE_N_BYTES(p_dst, p_src, size) \
-do { \
-	memcpy(p_dst, p_src, size); \
-	p_dst = (u8 *)p_dst + size; \
-	p_src = (u8 *)p_src + size; \
-} while (0)
-
 #define QMI_ENCDEC_ENCODE_U8(p_dst, p_src) \
 do { \
 	memcpy(p_dst, p_src, sizeof(u8)); \
@@ -58,13 +51,6 @@ do { \
 	p_src = (u8 *)p_src + sizeof(u64); \
 } while (0)
 
-#define QMI_ENCDEC_DECODE_N_BYTES(p_dst, p_src, size) \
-do { \
-	memcpy(p_dst, p_src, size); \
-	p_dst = (u8 *)p_dst + size; \
-	p_src = (u8 *)p_src + size; \
-} while (0)
-
 #define QMI_ENCDEC_DECODE_U8(p_dst, p_src) \
 do { \
 	memcpy(p_dst, p_src, sizeof(u8)); \
@@ -225,7 +211,21 @@ static int qmi_encode_basic_elem(void *buf_dst, const void *buf_src,
 	u32 i, rc = 0;
 
 	for (i = 0; i < elem_len; i++) {
-		QMI_ENCDEC_ENCODE_N_BYTES(buf_dst, buf_src, elem_size);
+		switch (elem_size) {
+		case sizeof(u8):
+			QMI_ENCDEC_ENCODE_U8(buf_dst, buf_src);
+			break;
+		case sizeof(u16):
+			QMI_ENCDEC_ENCODE_U16(buf_dst, buf_src);
+			break;
+		case sizeof(u32):
+			QMI_ENCDEC_ENCODE_U32(buf_dst, buf_src);
+			break;
+		case sizeof(u64):
+			QMI_ENCDEC_ENCODE_U64(buf_dst, buf_src);
+			break;
+		}
+
 		rc += elem_size;
 	}
 
@@ -508,7 +508,21 @@ static int qmi_decode_basic_elem(void *buf_dst, const void *buf_src,
 	u32 i, rc = 0;
 
 	for (i = 0; i < elem_len; i++) {
-		QMI_ENCDEC_DECODE_N_BYTES(buf_dst, buf_src, elem_size);
+		switch (elem_size) {
+		case sizeof(u8):
+			QMI_ENCDEC_DECODE_U8(buf_dst, buf_src);
+			break;
+		case sizeof(u16):
+			QMI_ENCDEC_DECODE_U16(buf_dst, buf_src);
+			break;
+		case sizeof(u32):
+			QMI_ENCDEC_DECODE_U32(buf_dst, buf_src);
+			break;
+		case sizeof(u64):
+			QMI_ENCDEC_DECODE_U64(buf_dst, buf_src);
+			break;
+		}
+
 		rc += elem_size;
 	}
 
-- 
2.43.0