linux-kernel - [PATCH 3.19.y-ckt 128/251] i2c: mux: Use __i2c_transfer() instead of calling parent's master

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Message-Id: <1437008972-9140-129-git-send-email-kamal@canonical.com>
Date:	Wed, 15 Jul 2015 18:07:29 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Alexander Sverdlin <alexander.sverdlin@...ia.com>,
	Wolfram Sang <wsa@...-dreams.de>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 128/251] i2c: mux: Use __i2c_transfer() instead of calling parent's master_xfer()

3.19.8-ckt4 -stable review patch.  If anyone has any objections, please let me know.

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

From: Alexander Sverdlin <alexander.sverdlin@...ia.com>

commit e766f338a74200b8104b1165776b19f56e252834 upstream.

Newly introduced quirks infrastructure doesn't work for the devices behind
MUXes because MUX's master_xfer() calls parent's master_xfer() directly
without checking the quirks. Instead of duplicating check code in MUX just
call __i2c_transfer() instead. This has a side effect on tracing (messages
will appear on both MUX bus and parent bus), but maybe that's not bad at
the end.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...ia.com>
Tested-by: Łukasz Gemborowski <lukasz.gemborowski@...ia.com>
Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
Fixes: b7f625840267b1 ("i2c: add quirk checks to core")
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/i2c/i2c-mux.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/i2c-mux.c b/drivers/i2c/i2c-mux.c
index 06cc1ff..98dd5d4 100644
--- a/drivers/i2c/i2c-mux.c
+++ b/drivers/i2c/i2c-mux.c
@@ -51,7 +51,7 @@ static int i2c_mux_master_xfer(struct i2c_adapter *adap,
 
 	ret = priv->select(parent, priv->mux_priv, priv->chan_id);
 	if (ret >= 0)
-		ret = parent->algo->master_xfer(parent, msgs, num);
+		ret = __i2c_transfer(parent, msgs, num);
 	if (priv->deselect)
 		priv->deselect(parent, priv->mux_priv, priv->chan_id);
 
-- 
1.9.1

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