linux-kernel - [PATCH 4.19 36/73] i2c: mlxcpld: Fix wrong initialization order in probe

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Message-Id: <20190607153853.136918240@linuxfoundation.org>
Date:   Fri,  7 Jun 2019 17:39:23 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Vadim Pasternak <vadimp@...lanox.com>,
        Wolfram Sang <wsa@...-dreams.de>, stable@...nel.org
Subject: [PATCH 4.19 36/73] i2c: mlxcpld: Fix wrong initialization order in probe

From: Vadim Pasternak <vadimp@...lanox.com>

commit 13067ef73f337336e3149f5bb9f3fd05fe7f87a0 upstream.

Fix wrong order in probing routine initialization - field `base_addr'
is used before it's initialized. Move assignment of 'priv->base_addr`
to the beginning, prior the call to mlxcpld_i2c_read_comm().
Wrong order caused the first read of capability register to be executed
at wrong offset 0x0 instead of 0x2000. By chance it was a "good
garbage" at 0x0 offset.

Fixes: 313ce648b5a4 ("i2c: mlxcpld: Add support for extended transaction length for i2c-mlxcpld")
Signed-off-by: Vadim Pasternak <vadimp@...lanox.com>
Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
Cc: stable@...nel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/drivers/i2c/busses/i2c-mlxcpld.c
+++ b/drivers/i2c/busses/i2c-mlxcpld.c
@@ -503,6 +503,7 @@ static int mlxcpld_i2c_probe(struct plat
 	platform_set_drvdata(pdev, priv);
 
 	priv->dev = &pdev->dev;
+	priv->base_addr = MLXPLAT_CPLD_LPC_I2C_BASE_ADDR;
 
 	/* Register with i2c layer */
 	mlxcpld_i2c_adapter.timeout = usecs_to_jiffies(MLXCPLD_I2C_XFER_TO);
@@ -518,7 +519,6 @@ static int mlxcpld_i2c_probe(struct plat
 		mlxcpld_i2c_adapter.nr = pdev->id;
 	priv->adap = mlxcpld_i2c_adapter;
 	priv->adap.dev.parent = &pdev->dev;
-	priv->base_addr = MLXPLAT_CPLD_LPC_I2C_BASE_ADDR;
 	i2c_set_adapdata(&priv->adap, priv);
 
 	err = i2c_add_numbered_adapter(&priv->adap);