can: mcp251x: Check return value of spi_setup()

This patch moves setup of SPI bus a bit earlier and adds check for spi_setup()
result to be sure SPI bus is communicating with the device properly.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Tested-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/mcp251x.c b/drivers/net/can/mcp251x.c
index 28c11f8..356d3da 100644 (file)
--- a/drivers/net/can/mcp251x.c
+++ b/drivers/net/can/mcp251x.c
@@ -1032,8 +1032,8 @@ static int mcp251x_can_probe(struct spi_device *spi)
        struct mcp251x_platform_data *pdata = dev_get_platdata(&spi->dev);
        struct net_device *net;
        struct mcp251x_priv *priv;
-       int freq, ret = -ENODEV;
        struct clk *clk;
+       int freq, ret;
 
        clk = devm_clk_get(&spi->dev, NULL);
        if (IS_ERR(clk)) {
@@ -1076,6 +1076,18 @@ static int mcp251x_can_probe(struct spi_device *spi)
        priv->net = net;
        priv->clk = clk;
 
+       spi_set_drvdata(spi, priv);
+
+       /* Configure the SPI bus */
+       spi->bits_per_word = 8;
+       if (mcp251x_is_2510(spi))
+               spi->max_speed_hz = spi->max_speed_hz ? : 5 * 1000 * 1000;
+       else
+               spi->max_speed_hz = spi->max_speed_hz ? : 10 * 1000 * 1000;
+       ret = spi_setup(spi);
+       if (ret)
+               goto out_clk;
+
        priv->power = devm_regulator_get(&spi->dev, "vdd");
        priv->transceiver = devm_regulator_get(&spi->dev, "xceiver");
        if ((PTR_ERR(priv->power) == -EPROBE_DEFER) ||
@@ -1088,8 +1100,6 @@ static int mcp251x_can_probe(struct spi_device *spi)
        if (ret)
                goto out_clk;
 
-       spi_set_drvdata(spi, priv);
-
        priv->spi = spi;
        mutex_init(&priv->mcp_lock);
 
@@ -1134,15 +1144,6 @@ static int mcp251x_can_probe(struct spi_device *spi)
 
        SET_NETDEV_DEV(net, &spi->dev);
 
-       /* Configure the SPI bus */
-       spi->mode = spi->mode ? : SPI_MODE_0;
-       if (mcp251x_is_2510(spi))
-               spi->max_speed_hz = spi->max_speed_hz ? : 5 * 1000 * 1000;
-       else
-               spi->max_speed_hz = spi->max_speed_hz ? : 10 * 1000 * 1000;
-       spi->bits_per_word = 8;
-       spi_setup(spi);
-
        /* Here is OK to not lock the MCP, no one knows about it yet */
        if (!mcp251x_hw_probe(spi)) {
                ret = -ENODEV;