linux-kernel - [PATCH AUTOSEL 4.19 118/209] i2c: tegra: use core to detect 'no zero length' quirk

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Date:   Tue, 12 Nov 2019 20:48:54 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Jon Hunter <jonathanh@...dia.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Sasha Levin <sashal@...nel.org>, linux-i2c@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 118/209] i2c: tegra: use core to detect 'no zero length' quirk

From: Wolfram Sang <wsa+renesas@...g-engineering.com>

[ Upstream commit c96c0f2683804b710531e7b754dcd02b5ded6d4a ]

And don't reimplement in the driver.

Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
Acked-by: Jon Hunter <jonathanh@...dia.com>
Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/i2c/busses/i2c-tegra.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index ef13b6ce9d8de..47d196c026ba6 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -684,9 +684,6 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
 
 	tegra_i2c_flush_fifos(i2c_dev);
 
-	if (msg->len == 0)
-		return -EINVAL;
-
 	i2c_dev->msg_buf = msg->buf;
 	i2c_dev->msg_buf_remaining = msg->len;
 	i2c_dev->msg_err = I2C_ERR_NONE;
@@ -831,6 +828,7 @@ static const struct i2c_algorithm tegra_i2c_algo = {
 
 /* payload size is only 12 bit */
 static const struct i2c_adapter_quirks tegra_i2c_quirks = {
+	.flags = I2C_AQ_NO_ZERO_LEN,
 	.max_read_len = 4096,
 	.max_write_len = 4096 - 12,
 };
-- 
2.20.1