Subject: [PATCH v4] mwifiex: Reduce endian conversion for REG Host Commands

From: Prasun Maiti <[email-masked]>
Date: Mon, 27 Jun 2016 15:43:22 +0530

For multiple REG Host Commands (e.g HostCmd_CMD_802_11_EEPROM_ACCESS,
HostCmd_CMD_MAC_REG_ACCESS etc.) "cpu_to_leX"-converted values are
saved to driver. So, "leX_to_cpu" conversion is required too many
times afterwards in driver.

This patch reduces the endian: conversion without saving "cpu_to_leX"
converted values in driver. This will convert endianness in prepare
command and command response path.

Signed-off-by: Prasun Maiti <[email-masked]>
---
Changes in v3:
	- Fixed the following warnings:
	* sta_ioctl.c:1339:34: warning: comparison of distinct pointer types lacks a cast [enabled by default]
	* sta_cmdresp.c:821:6: warning: comparison of distinct pointer types lacks a cast [enabled by default]

Changes in v4:
	- Fixed the sparse compilation warnings:
	* warning: cast from restricted __le32
	* warning: cast from restricted __le16

 drivers/net/wireless/marvell/mwifiex/ioctl.h       | 10 +++---
 drivers/net/wireless/marvell/mwifiex/sta_cmd.c     | 28 +++++++---------
 drivers/net/wireless/marvell/mwifiex/sta_cmdresp.c | 37 +++++++++++-----------
 drivers/net/wireless/marvell/mwifiex/sta_ioctl.c   | 21 ++++++------
 4 files changed, 46 insertions(+), 50 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/ioctl.h b/drivers/net/wireless/marvell/mwifiex/ioctl.h
index a5a48c1..4ce9330 100644
--- a/drivers/net/wireless/marvell/mwifiex/ioctl.h
+++ b/drivers/net/wireless/marvell/mwifiex/ioctl.h
@@ -341,16 +341,16 @@ enum {
 };

 struct mwifiex_ds_reg_rw {
-	__le32 type;
-	__le32 offset;
-	__le32 value;
+	u32 type;
+	u32 offset;
+	u32 value;
 };

 #define MAX_EEPROM_DATA 256

 struct mwifiex_ds_read_eeprom {
-	__le16 offset;
-	__le16 byte_count;
+	u16 offset;
+	u16 byte_count;
 	u8 value[MAX_EEPROM_DATA];
 };

diff --git a/drivers/net/wireless/marvell/mwifiex/sta_cmd.c b/drivers/net/wireless/marvell/mwifiex/sta_cmd.c
index e436574..9df02ba 100644
--- a/drivers/net/wireless/marvell/mwifiex/sta_cmd.c
+++ b/drivers/net/wireless/marvell/mwifiex/sta_cmd.c
@@ -1130,9 +1130,8 @@ static int mwifiex_cmd_reg_access(struct host_cmd_ds_command *cmd,
 		cmd->size = cpu_to_le16(sizeof(*mac_reg) + S_DS_GEN);
 		mac_reg = &cmd->params.mac_reg;
 		mac_reg->action = cpu_to_le16(cmd_action);
-		mac_reg->offset =
-			cpu_to_le16((u16) le32_to_cpu(reg_rw->offset));
-		mac_reg->value = reg_rw->value;
+		mac_reg->offset = cpu_to_le16((u16) reg_rw->offset);
+		mac_reg->value = cpu_to_le32(reg_rw->value);
 		break;
 	}
 	case HostCmd_CMD_BBP_REG_ACCESS:
@@ -1142,9 +1141,8 @@ static int mwifiex_cmd_reg_access(struct host_cmd_ds_command *cmd,
 		cmd->size = cpu_to_le16(sizeof(*bbp_reg) + S_DS_GEN);
 		bbp_reg = &cmd->params.bbp_reg;
 		bbp_reg->action = cpu_to_le16(cmd_action);
-		bbp_reg->offset =
-			cpu_to_le16((u16) le32_to_cpu(reg_rw->offset));
-		bbp_reg->value = (u8) le32_to_cpu(reg_rw->value);
+		bbp_reg->offset = cpu_to_le16((u16) reg_rw->offset);
+		bbp_reg->value = (u8) reg_rw->value;
 		break;
 	}
 	case HostCmd_CMD_RF_REG_ACCESS:
@@ -1154,8 +1152,8 @@ static int mwifiex_cmd_reg_access(struct host_cmd_ds_command *cmd,
 		cmd->size = cpu_to_le16(sizeof(*rf_reg) + S_DS_GEN);
 		rf_reg = &cmd->params.rf_reg;
 		rf_reg->action = cpu_to_le16(cmd_action);
-		rf_reg->offset = cpu_to_le16((u16) le32_to_cpu(reg_rw->offset));
-		rf_reg->value = (u8) le32_to_cpu(reg_rw->value);
+		rf_reg->offset = cpu_to_le16((u16) reg_rw->offset);
+		rf_reg->value = (u8) reg_rw->value;
 		break;
 	}
 	case HostCmd_CMD_PMIC_REG_ACCESS:
@@ -1165,9 +1163,8 @@ static int mwifiex_cmd_reg_access(struct host_cmd_ds_command *cmd,
 		cmd->size = cpu_to_le16(sizeof(*pmic_reg) + S_DS_GEN);
 		pmic_reg = &cmd->params.pmic_reg;
 		pmic_reg->action = cpu_to_le16(cmd_action);
-		pmic_reg->offset =
-				cpu_to_le16((u16) le32_to_cpu(reg_rw->offset));
-		pmic_reg->value = (u8) le32_to_cpu(reg_rw->value);
+		pmic_reg->offset = cpu_to_le16((u16) reg_rw->offset);
+		pmic_reg->value = (u8) reg_rw->value;
 		break;
 	}
 	case HostCmd_CMD_CAU_REG_ACCESS:
@@ -1177,9 +1174,8 @@ static int mwifiex_cmd_reg_access(struct host_cmd_ds_command *cmd,
 		cmd->size = cpu_to_le16(sizeof(*cau_reg) + S_DS_GEN);
 		cau_reg = &cmd->params.rf_reg;
 		cau_reg->action = cpu_to_le16(cmd_action);
-		cau_reg->offset =
-				cpu_to_le16((u16) le32_to_cpu(reg_rw->offset));
-		cau_reg->value = (u8) le32_to_cpu(reg_rw->value);
+		cau_reg->offset = cpu_to_le16((u16) reg_rw->offset);
+		cau_reg->value = (u8) reg_rw->value;
 		break;
 	}
 	case HostCmd_CMD_802_11_EEPROM_ACCESS:
@@ -1190,8 +1186,8 @@ static int mwifiex_cmd_reg_access(struct host_cmd_ds_command *cmd,

 		cmd->size = cpu_to_le16(sizeof(*cmd_eeprom) + S_DS_GEN);
 		cmd_eeprom->action = cpu_to_le16(cmd_action);
-		cmd_eeprom->offset = rd_eeprom->offset;
-		cmd_eeprom->byte_count = rd_eeprom->byte_count;
+		cmd_eeprom->offset = cpu_to_le16(rd_eeprom->offset);
+		cmd_eeprom->byte_count = cpu_to_le16(rd_eeprom->byte_count);
 		cmd_eeprom->value = 0;
 		break;
 	}
diff --git a/drivers/net/wireless/marvell/mwifiex/sta_cmdresp.c b/drivers/net/wireless/marvell/mwifiex/sta_cmdresp.c
index d18c797..1832511 100644
--- a/drivers/net/wireless/marvell/mwifiex/sta_cmdresp.c
+++ b/drivers/net/wireless/marvell/mwifiex/sta_cmdresp.c
@@ -781,45 +781,44 @@ static int mwifiex_ret_reg_access(u16 type, struct host_cmd_ds_command *resp,
 	switch (type) {
 	case HostCmd_CMD_MAC_REG_ACCESS:
 		r.mac = &resp->params.mac_reg;
-		reg_rw->offset = cpu_to_le32((u32) le16_to_cpu(r.mac->offset));
-		reg_rw->value = r.mac->value;
+		reg_rw->offset = (u32) le16_to_cpu(r.mac->offset);
+		reg_rw->value = le32_to_cpu(r.mac->value);
 		break;
 	case HostCmd_CMD_BBP_REG_ACCESS:
 		r.bbp = &resp->params.bbp_reg;
-		reg_rw->offset = cpu_to_le32((u32) le16_to_cpu(r.bbp->offset));
-		reg_rw->value = cpu_to_le32((u32) r.bbp->value);
+		reg_rw->offset = (u32) le16_to_cpu(r.bbp->offset);
+		reg_rw->value = (u32) r.bbp->value;
 		break;

 	case HostCmd_CMD_RF_REG_ACCESS:
 		r.rf = &resp->params.rf_reg;
-		reg_rw->offset = cpu_to_le32((u32) le16_to_cpu(r.rf->offset));
-		reg_rw->value = cpu_to_le32((u32) r.bbp->value);
+		reg_rw->offset = (u32) le16_to_cpu(r.rf->offset);
+		reg_rw->value = (u32) r.bbp->value;
 		break;
 	case HostCmd_CMD_PMIC_REG_ACCESS:
 		r.pmic = &resp->params.pmic_reg;
-		reg_rw->offset = cpu_to_le32((u32) le16_to_cpu(r.pmic->offset));
-		reg_rw->value = cpu_to_le32((u32) r.pmic->value);
+		reg_rw->offset = (u32) le16_to_cpu(r.pmic->offset);
+		reg_rw->value = (u32) r.pmic->value;
 		break;
 	case HostCmd_CMD_CAU_REG_ACCESS:
 		r.rf = &resp->params.rf_reg;
-		reg_rw->offset = cpu_to_le32((u32) le16_to_cpu(r.rf->offset));
-		reg_rw->value = cpu_to_le32((u32) r.rf->value);
+		reg_rw->offset = (u32) le16_to_cpu(r.rf->offset);
+		reg_rw->value = (u32) r.rf->value;
 		break;
 	case HostCmd_CMD_802_11_EEPROM_ACCESS:
 		r.eeprom = &resp->params.eeprom;
-		pr_debug("info: EEPROM read len=%x\n", r.eeprom->byte_count);
-		if (le16_to_cpu(eeprom->byte_count) <
-		    le16_to_cpu(r.eeprom->byte_count)) {
-			eeprom->byte_count = cpu_to_le16(0);
+		pr_debug("info: EEPROM read len=%x\n",
+				le16_to_cpu(r.eeprom->byte_count));
+		if (eeprom->byte_count < le16_to_cpu(r.eeprom->byte_count)) {
+			eeprom->byte_count = 0;
 			pr_debug("info: EEPROM read length is too big\n");
 			return -1;
 		}
-		eeprom->offset = r.eeprom->offset;
-		eeprom->byte_count = r.eeprom->byte_count;
-		if (le16_to_cpu(eeprom->byte_count) > 0)
+		eeprom->offset = le16_to_cpu(r.eeprom->offset);
+		eeprom->byte_count = le16_to_cpu(r.eeprom->byte_count);
+		if (eeprom->byte_count > 0)
 			memcpy(&eeprom->value, &r.eeprom->value,
-			       le16_to_cpu(r.eeprom->byte_count));
-
+			       min((u16)MAX_EEPROM_DATA, eeprom->byte_count));
 		break;
 	default:
 		return -1;
diff --git a/drivers/net/wireless/marvell/mwifiex/sta_ioctl.c b/drivers/net/wireless/marvell/mwifiex/sta_ioctl.c
index 8e08626..6dab5ca 100644
--- a/drivers/net/wireless/marvell/mwifiex/sta_ioctl.c
+++ b/drivers/net/wireless/marvell/mwifiex/sta_ioctl.c
@@ -1247,7 +1247,7 @@ static int mwifiex_reg_mem_ioctl_reg_rw(struct mwifiex_private *priv,
 {
 	u16 cmd_no;

-	switch (le32_to_cpu(reg_rw->type)) {
+	switch (reg_rw->type) {
 	case MWIFIEX_REG_MAC:
 		cmd_no = HostCmd_CMD_MAC_REG_ACCESS;
 		break;
@@ -1282,9 +1282,9 @@ mwifiex_reg_write(struct mwifiex_private *priv, u32 reg_type,
 {
 	struct mwifiex_ds_reg_rw reg_rw;

-	reg_rw.type = cpu_to_le32(reg_type);
-	reg_rw.offset = cpu_to_le32(reg_offset);
-	reg_rw.value = cpu_to_le32(reg_value);
+	reg_rw.type = reg_type;
+	reg_rw.offset = reg_offset;
+	reg_rw.value = reg_value;

 	return mwifiex_reg_mem_ioctl_reg_rw(priv, &reg_rw, HostCmd_ACT_GEN_SET);
 }
@@ -1302,14 +1302,14 @@ mwifiex_reg_read(struct mwifiex_private *priv, u32 reg_type,
 	int ret;
 	struct mwifiex_ds_reg_rw reg_rw;

-	reg_rw.type = cpu_to_le32(reg_type);
-	reg_rw.offset = cpu_to_le32(reg_offset);
+	reg_rw.type = reg_type;
+	reg_rw.offset = reg_offset;
 	ret = mwifiex_reg_mem_ioctl_reg_rw(priv, &reg_rw, HostCmd_ACT_GEN_GET);

 	if (ret)
 		goto done;

-	*value = le32_to_cpu(reg_rw.value);
+	*value = reg_rw.value;

 done:
 	return ret;
@@ -1328,15 +1328,16 @@ mwifiex_eeprom_read(struct mwifiex_private *priv, u16 offset, u16 bytes,
 	int ret;
 	struct mwifiex_ds_read_eeprom rd_eeprom;

-	rd_eeprom.offset = cpu_to_le16((u16) offset);
-	rd_eeprom.byte_count = cpu_to_le16((u16) bytes);
+	rd_eeprom.offset =  offset;
+	rd_eeprom.byte_count = bytes;

 	/* Send request to firmware */
 	ret = mwifiex_send_cmd(priv, HostCmd_CMD_802_11_EEPROM_ACCESS,
 			       HostCmd_ACT_GEN_GET, 0, &rd_eeprom, true);

 	if (!ret)
-		memcpy(value, rd_eeprom.value, MAX_EEPROM_DATA);
+		memcpy(value, rd_eeprom.value, min((u16)MAX_EEPROM_DATA,
+		       rd_eeprom.byte_count));
 	return ret;
 }

--
1.9.1