spi/tegra: Fix device remove function

The call to spi_unregister_master() in the device remove function frees device
memory, and with it any device local data. However, device local data is still
accessed after the call to spi_unregister_master().

Acquire a reference to the SPI master device and release it after cleanup is
complete to solve the problem.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/drivers/spi/spi-tegra.c b/drivers/spi/spi-tegra.c
index ef52c1c..e28445d 100644 (file)
--- a/drivers/spi/spi-tegra.c
+++ b/drivers/spi/spi-tegra.c
@@ -652,7 +652,7 @@ static int __devexit spi_tegra_remove(struct platform_device *pdev)
        struct spi_tegra_data   *tspi;
        struct resource         *r;
 
-       master = dev_get_drvdata(&pdev->dev);
+       master = spi_master_get(dev_get_drvdata(&pdev->dev));
        tspi = spi_master_get_devdata(master);
 
        spi_unregister_master(master);
@@ -668,6 +668,8 @@ static int __devexit spi_tegra_remove(struct platform_device *pdev)
        clk_put(tspi->clk);
        iounmap(tspi->base);
 
+       spi_master_put(master);
+
        r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        release_mem_region(r->start, resource_size(r));