linux-kernel - [PATCH v1 1/1] mfd: bxtwc: remove unnecessary i2c

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Date:   Thu, 30 Mar 2017 16:35:40 -0700
From:   sathyanarayanan.kuppuswamy@...ux.intel.com
To:     lee.jones@...aro.org
Cc:     sathyaosid@...il.com, linux-kernel@...r.kernel.org,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Subject: [PATCH v1 1/1] mfd: bxtwc: remove unnecessary i2c_addr checks in ipc calls

From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>

In the following code block, BXTWC_DEVICE1_ADDR value is
already fixed and hence there no need to check for
if (!i2c_addr) in every ipc read/write calls. Even if this
check is required it can be moved to probe function.

i2c_addr = BXTWC_DEVICE1_ADDR;
if (!i2c_addr) {
	dev_err(pmic->dev, "I2C address not set\n");
	return -EINVAL;
}

This patch remove this extra check and adds some NULL
parameter checks.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
---
 drivers/mfd/intel_soc_pmic_bxtwc.c | 22 ++++++++++------------
 1 file changed, 10 insertions(+), 12 deletions(-)

diff --git a/drivers/mfd/intel_soc_pmic_bxtwc.c b/drivers/mfd/intel_soc_pmic_bxtwc.c
index 699c8c7..583d17d 100644
--- a/drivers/mfd/intel_soc_pmic_bxtwc.c
+++ b/drivers/mfd/intel_soc_pmic_bxtwc.c
@@ -237,15 +237,14 @@ static int regmap_ipc_byte_reg_read(void *context, unsigned int reg,
 	u8 ipc_out[4];
 	struct intel_soc_pmic *pmic = context;
 
+	if (!pmic)
+		return -EINVAL;
+
 	if (reg & REG_ADDR_MASK)
 		i2c_addr = (reg & REG_ADDR_MASK) >> REG_ADDR_SHIFT;
-	else {
+	else
 		i2c_addr = BXTWC_DEVICE1_ADDR;
-		if (!i2c_addr) {
-			dev_err(pmic->dev, "I2C address not set\n");
-			return -EINVAL;
-		}
-	}
+
 	reg &= REG_OFFSET_MASK;
 
 	ipc_in[0] = reg;
@@ -270,15 +269,14 @@ static int regmap_ipc_byte_reg_write(void *context, unsigned int reg,
 	u8 ipc_in[3];
 	struct intel_soc_pmic *pmic = context;
 
+	if (!pmic)
+		return -EINVAL;
+
 	if (reg & REG_ADDR_MASK)
 		i2c_addr = (reg & REG_ADDR_MASK) >> REG_ADDR_SHIFT;
-	else {
+	else
 		i2c_addr = BXTWC_DEVICE1_ADDR;
-		if (!i2c_addr) {
-			dev_err(pmic->dev, "I2C address not set\n");
-			return -EINVAL;
-		}
-	}
+
 	reg &= REG_OFFSET_MASK;
 
 	ipc_in[0] = reg;
-- 
2.7.4