linux-kernel - [PATCH] i2c-hix5hd2: Add I2C_M_STOP flag support for i2c-hix5hd2 driver.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20220930014507.5612-1-taolan@huawei.com>
Date:   Fri, 30 Sep 2022 01:45:07 +0000
From:   Tao Lan <taolan@...wei.com>
To:     <linux-i2c@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     taolan <taolan@...wei.com>
Subject: [PATCH] i2c-hix5hd2:  Add I2C_M_STOP flag support for i2c-hix5hd2 driver.

From: taolan <taolan@...wei.com>

For compatibility, some devices need to work with controller between
messages using a stop.

Signed-off-by: taolan <taolan@...wei.com>
---
 drivers/i2c/busses/i2c-hix5hd2.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-hix5hd2.c b/drivers/i2c/busses/i2c-hix5hd2.c
index 61ae58f57047..e5042e34ecc7 100644
--- a/drivers/i2c/busses/i2c-hix5hd2.c
+++ b/drivers/i2c/busses/i2c-hix5hd2.c
@@ -360,7 +360,11 @@ static int hix5hd2_i2c_xfer(struct i2c_adapter *adap,
 	pm_runtime_get_sync(priv->dev);

 	for (i = 0; i < num; i++, msgs++) {
-		stop = (i == num - 1);
+		if ((i == num - 1) || (msgs->flags & I2C_M_STOP))
+			stop = 1;
+		else
+			stop = 0;
+
 		ret = hix5hd2_i2c_xfer_msg(priv, msgs, stop);
 		if (ret < 0)
 			goto out;
-- 
2.22.0