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
--- a/drivers/spi/spi-tegra.c
+++ b/drivers/spi/spi-tegra.c
@@ -652,7 +652,7 @@
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 @@
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));