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 640cbb2..3384a71 100644
--- a/drivers/i2c/busses/i2c-sh_mobile.c
+++ b/drivers/i2c/busses/i2c-sh_mobile.c
@@ -318,7 +318,8 @@
} 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++;