SPI driver runtime footprint shrinkage

Shrink the runtime footprint of various SPI drivers:

  - Move the probe() routine into the init section where practical,
    using platform_driver_probe() to make that safe.  This often saves
    around 1KB.  Using platform_driver_probe() can also be a correctness
    fix, if the probe routine is already marked __init but the driver
    struct keeps a dangling pointer to it after init section removal.

  - Likewise move remove() routines into the exit sections.

These changes would be inappropriate iff the platform devices were
actually hotpluggable (e.g. they're found on optional addon cards,
or in an FPGA that's dynamically reprogrammed).  In these cases,
that's not the situation; it's an SOC controller and the only device
is initialized before these drivers.

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>

1 files changed, 4 insertions, 5 deletions

diff --git a/drivers/spi/spi_s3c24xx.c b/drivers/spi/spi_s3c24xx.c
index e9b683f7d7b3..89d6685a5ca4 100644
--- a/drivers/spi/spi_s3c24xx.c
+++ b/drivers/spi/spi_s3c24xx.c
@@ -233,7 +233,7 @@ static irqreturn_t s3c24xx_spi_irq(int irq, void *dev)
         return IRQ_HANDLED;
 }
 
-static int s3c24xx_spi_probe(struct platform_device *pdev)
+static int __init s3c24xx_spi_probe(struct platform_device *pdev)
 {
         struct s3c24xx_spi *hw;
         struct spi_master *master;
@@ -382,7 +382,7 @@ static int s3c24xx_spi_probe(struct platform_device *pdev)
         return err;
 }
 
-static int s3c24xx_spi_remove(struct platform_device *dev)
+static int __exit s3c24xx_spi_remove(struct platform_device *dev)
 {
         struct s3c24xx_spi *hw = platform_get_drvdata(dev);
 
@@ -429,8 +429,7 @@ static int s3c24xx_spi_resume(struct platform_device *pdev)
 
 MODULE_ALIAS("s3c2410_spi");                    /* for platform bus hotplug */
 static struct platform_driver s3c24xx_spidrv = {
-        .probe          = s3c24xx_spi_probe,
-        .remove         = s3c24xx_spi_remove,
+        .remove         = __exit_p(s3c24xx_spi_remove),
         .suspend        = s3c24xx_spi_suspend,
         .resume         = s3c24xx_spi_resume,
         .driver         = {
@@ -441,7 +440,7 @@ static struct platform_driver s3c24xx_spidrv = {
 
 static int __init s3c24xx_spi_init(void)
 {
-        return platform_driver_register(&s3c24xx_spidrv);
+        return platform_driver_probe(&s3c24xx_spidrv, s3c24xx_spi_probe);
 }
 
 static void __exit s3c24xx_spi_exit(void)