linux-kernel - [PATCH] i2c-eg20t : Fix the issue of Combined R/W transfer mode

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Date:	Thu, 23 Jun 2011 16:17:10 +0900
From:	Tomoya MORINAGA <tomoya-linux@....okisemi.com>
To:	Jean Delvare <khali@...ux-fr.org>, Ben Dooks <ben-linux@...ff.org>,
	Wolfram Sang <w.sang@...gutronix.de>,
	Qi Wang <qi.wang@...el.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	yong.y.wang@...el.com, joel.clark@...el.com,
	kok.howg.ewe@...el.com, toshiharu-linux@....okisemi.com,
	Tomoya MORINAGA <tomoya-linux@....okisemi.com>
Subject: [PATCH] i2c-eg20t : Fix the issue of Combined R/W transfer mode

issue-1
In case combined transfer mode fails halfway, the processing must be stopped halfway.
However currently, the processing is continued.
This patch breaks the processing.

issue-2
Currently, pch_i2c_xfer returns read/write size at that time.
However pch_i2c_xfer must return the number of messages to be read/written.
This patch modifies correctly.

Signed-off-by: Tomoya MORINAGA <tomoya-linux@....okisemi.com>
---
 drivers/i2c/busses/i2c-eg20t.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/i2c-eg20t.c b/drivers/i2c/busses/i2c-eg20t.c
index b2f94dc..4bc272e 100644
--- a/drivers/i2c/busses/i2c-eg20t.c
+++ b/drivers/i2c/busses/i2c-eg20t.c
@@ -672,7 +672,7 @@ static s32 pch_i2c_xfer(struct i2c_adapter *i2c_adap,
 	/* transfer not completed */
 	adap->pch_i2c_xfer_in_progress = true;
 
-	for (i = 0; i < num; i++) {
+	for (i = 0; i < num && ret >= 0; i++) {
 		pmsg = &msgs[i];
 		pmsg->flags |= adap->pch_buff_mode_en;
 		status = pmsg->flags;
@@ -698,7 +698,7 @@ static s32 pch_i2c_xfer(struct i2c_adapter *i2c_adap,
 
 	mutex_unlock(&pch_mutex);
 
-	return ret;
+	return (ret < 0) ? ret : num;
 }
 
 /**
-- 
1.7.4.4

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