From: Jean Delvare <khali@linux-fr.org>
Date: Wed, 6 Feb 2008 09:38:41 +0000 (-0800)
Subject: rtc-pcf8583: Don't abuse I2C_M_NOSTART
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=037e291cc77a4beb0379a8c74e3d82e49a476b84;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

rtc-pcf8583: Don't abuse I2C_M_NOSTART

The rtc-pcf8583 driver is using the I2C_M_NOSTART flag but shouldn't.  This
flag is only meant for broken chips and the PCF8583 RTC chip is not one of
these.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/drivers/rtc/rtc-pcf8583.c b/drivers/rtc/rtc-pcf8583.c
index c973ba94c422..8b3997007506 100644
--- a/drivers/rtc/rtc-pcf8583.c
+++ b/drivers/rtc/rtc-pcf8583.c
@@ -163,27 +163,17 @@ static int pcf8583_read_mem(struct i2c_client *client, struct rtc_mem *mem)
 
 static int pcf8583_write_mem(struct i2c_client *client, struct rtc_mem *mem)
 {
-	unsigned char addr[1];
-	struct i2c_msg msgs[2] = {
-		{
-			.addr = client->addr,
-			.flags = 0,
-			.len = 1,
-			.buf = addr,
-		}, {
-			.addr = client->addr,
-			.flags = I2C_M_NOSTART,
-			.len = mem->nr,
-			.buf = mem->data,
-		}
-	};
+	unsigned char buf[9];
+	int ret;
 
-	if (mem->loc < 8)
+	if (mem->loc < 8 || mem->nr > 8)
 		return -EINVAL;
 
-	addr[0] = mem->loc;
+	buf[0] = mem->loc;
+	memcpy(buf + 1, mem->data, mem->nr);
 
-	return i2c_transfer(client->adapter, msgs, 2) == 2 ? 0 : -EIO;
+	ret = i2c_master_send(client, buf, mem->nr + 1);
+	return ret == mem->nr + 1 ? 0 : -EIO;
 }
 
 static int pcf8583_rtc_read_time(struct device *dev, struct rtc_time *tm)