From: Magnus Damm <damm@igel.co.jp>
Date: Thu, 13 Nov 2008 06:28:21 +0000 (+0900)
Subject: i2c: fix i2c-sh_mobile rx underrun
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=bff4056c8b868a4311d5ebd6cbbf09a2c10f4551;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

i2c: fix i2c-sh_mobile rx underrun

Fix receive path underrun in i2c-sh_mobile driver.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
---

diff --git a/drivers/i2c/busses/i2c-sh_mobile.c b/drivers/i2c/busses/i2c-sh_mobile.c
index 640cbb237328..3384a717fec0 100644
--- a/drivers/i2c/busses/i2c-sh_mobile.c
+++ b/drivers/i2c/busses/i2c-sh_mobile.c
@@ -318,7 +318,8 @@ static int sh_mobile_i2c_isr_rx(struct sh_mobile_i2c_data *pd)
 		} else
 			data = i2c_op(pd, OP_RX, 0);
 
-		pd->msg->buf[real_pos] = data;
+		if (real_pos >= 0)
+			pd->msg->buf[real_pos] = data;
 	} while (0);
 
 	pd->pos++;