spi: fix spi_imx probe oopsing

Corrects spi_imx driver oops during initialization/probing: can't use
drv_data before it's allocated.

Signed-off-by: Julien Boibessot <julien.boibessot@armadeus.com>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/spi/spi_imx.c b/drivers/spi/spi_imx.c
index 0b4db0c..269a55e 100644 (file)
--- a/drivers/spi/spi_imx.c
+++ b/drivers/spi/spi_imx.c
@@ -1456,7 +1456,7 @@ static int __init spi_imx_probe(struct platform_device *pdev)
        struct device *dev = &pdev->dev;
        struct spi_imx_master *platform_info;
        struct spi_master *master;
-       struct driver_data *drv_data = NULL;
+       struct driver_data *drv_data;
        struct resource *res;
        int irq, status = 0;
 
@@ -1467,14 +1467,6 @@ static int __init spi_imx_probe(struct platform_device *pdev)
                goto err_no_pdata;
        }
 
-       drv_data->clk = clk_get(&pdev->dev, "perclk2");
-       if (IS_ERR(drv_data->clk)) {
-               dev_err(&pdev->dev, "probe - cannot get get\n");
-               status = PTR_ERR(drv_data->clk);
-               goto err_no_clk;
-       }
-       clk_enable(drv_data->clk);
-
        /* Allocate master with space for drv_data */
        master = spi_alloc_master(dev, sizeof(struct driver_data));
        if (!master) {
@@ -1495,6 +1487,14 @@ static int __init spi_imx_probe(struct platform_device *pdev)
 
        drv_data->dummy_dma_buf = SPI_DUMMY_u32;
 
+       drv_data->clk = clk_get(&pdev->dev, "perclk2");
+       if (IS_ERR(drv_data->clk)) {
+               dev_err(&pdev->dev, "probe - cannot get clock\n");
+               status = PTR_ERR(drv_data->clk);
+               goto err_no_clk;
+       }
+       clk_enable(drv_data->clk);
+
        /* Find and map resources */
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        if (!res) {
@@ -1630,12 +1630,13 @@ err_no_iomap:
        kfree(drv_data->ioarea);
 
 err_no_iores:
-       spi_master_put(master);
-
-err_no_pdata:
        clk_disable(drv_data->clk);
        clk_put(drv_data->clk);
+
 err_no_clk:
+       spi_master_put(master);
+
+err_no_pdata:
 err_no_mem:
        return status;
 }