linux-kernel - [PATCH 1/7] i2c: tegra: remove dead code

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Date:   Thu, 23 Jul 2020 17:48:47 +0530
From:   Krishna Yarlagadda <kyarlagadda@...dia.com>
To:     <digetx@...il.com>, <linux-i2c@...r.kernel.org>,
        <thierry.reding@...il.com>
CC:     <jonathanh@...dia.com>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <ldewangan@...dia.com>,
        <smohammed@...dia.com>, <rgumasta@...dia.com>,
        Krishna Yarlagadda <kyarlagadda@...dia.com>
Subject: [PATCH 1/7] i2c: tegra: remove dead code

From: Shardar Shariff Md <smohammed@...dia.com>

When I2C_HEADER_CONT_ON_NAK bit in IO header is set then “No ACK
from slave” error is not reported (NACK is considered as ACK
and transfer is continued). So if I2C_ERR_NO_ACK is set, it would
imply I2C_M_IGNORE_NAK is not set and hence this code will never
execute. When I2C_HEADER_CONT_ON_NAK bit in IO header is set then
“No ACK from slave” error is not reported.
Condition (msg->flags & I2C_M_IGNORE_NAK) will never be hit

Signed-off-by: Shardar Shariff Md <smohammed@...dia.com>
Signed-off-by: Krishna Yarlagadda <kyarlagadda@...dia.com>
---
 drivers/i2c/busses/i2c-tegra.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 1577296..c6c870c 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -1336,11 +1336,8 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
 		return -EAGAIN;
 	}
 
-	if (i2c_dev->msg_err == I2C_ERR_NO_ACK) {
-		if (msg->flags & I2C_M_IGNORE_NAK)
-			return 0;
+	if (i2c_dev->msg_err == I2C_ERR_NO_ACK)
 		return -EREMOTEIO;
-	}
 
 	return -EIO;
 }
-- 
2.7.4