linux-kernel - [PATCH 3.16 08/26] i2c: rk3x: fix 0 length write transfers

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Date:	Tue,  7 Oct 2014 16:19:24 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Doug Anderson <dianders@...omium.org>,
	Alexandru M Stan <amstan@...omium.org>,
	Max Schwarz <max.schwarz@...ine.de>,
	Wolfram Sang <wsa@...-dreams.de>
Subject: [PATCH 3.16 08/26] i2c: rk3x: fix 0 length write transfers

3.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alexandru M Stan <amstan@...omium.org>

commit cf27020d2f253bac6457d6833b97141030f0122a upstream.

i2cdetect -q was broken (everything was a false positive, and no transfers were
actually being sent over i2c). The way it works is by sending a 0 length write
request and checking for NACK. This patch fixes the 0 length writes and actually
sends them.

Reported-by: Doug Anderson <dianders@...omium.org>
Signed-off-by: Alexandru M Stan <amstan@...omium.org>
Tested-by: Doug Anderson <dianders@...omium.org>
Tested-by: Max Schwarz <max.schwarz@...ine.de>
Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/i2c/busses/i2c-rk3x.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/i2c/busses/i2c-rk3x.c
+++ b/drivers/i2c/busses/i2c-rk3x.c
@@ -238,7 +238,7 @@ static void rk3x_i2c_fill_transmit_buf(s
 	for (i = 0; i < 8; ++i) {
 		val = 0;
 		for (j = 0; j < 4; ++j) {
-			if (i2c->processed == i2c->msg->len)
+			if ((i2c->processed == i2c->msg->len) && (cnt != 0))
 				break;
 
 			if (i2c->processed == 0 && cnt == 0)


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