spi: fsl: Kill mpc8xxx_spi_cleanup and convert fsl_espi_setup to use devm_kzalloc

In current code, master->cleanup and master->setup are not set in the same
function. This makes it hard to read and not good for code maintain.
One example is in fsl-spi.c, master->cleanup is overrided in mpc8xxx_spi_probe()
which leads to a memory leak.

This patch removes mpc8xxx_spi_cleanup() and converts fsl_espi_setup to use
devm_kzalloc so we don't need to take care of freeing memory.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

drivers/spi/spi-fsl-espi.c

@@ -458,7 +458,7 @@ static int fsl_espi_setup(struct spi_device *spi)
 		return -EINVAL;
 
 	if (!cs) {
-		cs = kzalloc(sizeof *cs, GFP_KERNEL);
+		cs = devm_kzalloc(&spi->dev, sizeof(*cs), GFP_KERNEL);
 		if (!cs)
 			return -ENOMEM;
 		spi->controller_state = cs;

drivers/spi/spi-fsl-lib.c

@@ -99,11 +99,6 @@ int mpc8xxx_spi_transfer(struct spi_device *spi,
 	return 0;
 }
 
-void mpc8xxx_spi_cleanup(struct spi_device *spi)
-{
-	kfree(spi->controller_state);
-}
-
 const char *mpc8xxx_spi_strmode(unsigned int flags)
 {
 	if (flags & SPI_QE_CPU_MODE) {
@@ -134,7 +129,6 @@ int mpc8xxx_spi_probe(struct device *dev, struct resource *mem,
 			| SPI_LSB_FIRST | SPI_LOOP;
 
 	master->transfer = mpc8xxx_spi_transfer;
-	master->cleanup = mpc8xxx_spi_cleanup;
 	master->dev.of_node = dev->of_node;
 
 	mpc8xxx_spi = spi_master_get_devdata(master);

drivers/spi/spi-fsl-lib.h

@@ -124,7 +124,6 @@ extern struct mpc8xxx_spi_probe_info *to_of_pinfo(
 extern int mpc8xxx_spi_bufs(struct mpc8xxx_spi *mspi,
 		struct spi_transfer *t, unsigned int len);
 extern int mpc8xxx_spi_transfer(struct spi_device *spi, struct spi_message *m);
-extern void mpc8xxx_spi_cleanup(struct spi_device *spi);
 extern const char *mpc8xxx_spi_strmode(unsigned int flags);
 extern int mpc8xxx_spi_probe(struct device *dev, struct resource *mem,
 		unsigned int irq);