i2c: mux: Use __i2c_transfer() instead of calling parent's master_xfer()

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@nokia.com>
Tested-by: Łukasz Gemborowski <lukasz.gemborowski@nokia.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
Fixes: b7f625840267b1 ("i2c: add quirk checks to core")

diff --git a/drivers/i2c/i2c-mux.c b/drivers/i2c/i2c-mux.c
index f190e75..2ba7c0f 100644 (file)
--- 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);