spi/mpc52xx-psc: Avoid access to freed memory in 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>

drivers/spi/spi-mpc52xx-psc.c

@@ -481,7 +481,7 @@ static int __devinit mpc52xx_psc_spi_of_probe(struct platform_device *op)
 
 static int __devexit mpc52xx_psc_spi_of_remove(struct platform_device *op)
 {
-	struct spi_master *master = dev_get_drvdata(&op->dev);
+	struct spi_master *master = spi_master_get(dev_get_drvdata(&op->dev));
 	struct mpc52xx_psc_spi *mps = spi_master_get_devdata(master);
 
 	flush_workqueue(mps->workqueue);
@@ -490,6 +490,7 @@ static int __devexit mpc52xx_psc_spi_of_remove(struct platform_device *op)
 	free_irq(mps->irq, mps);
 	if (mps->psc)
 		iounmap(mps->psc);
+	spi_master_put(master);
 
 	return 0;
 }