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, 7 deletions

diff --git a/drivers/spi/pxa2xx_spi.c b/drivers/spi/pxa2xx_spi.c
index 16bf66b7c94e..e05918e79eae 100644
--- a/drivers/spi/pxa2xx_spi.c
+++ b/drivers/spi/pxa2xx_spi.c
@@ -1229,7 +1229,7 @@ static void cleanup(struct spi_device *spi)
         kfree(chip);
 }
 
-static int init_queue(struct driver_data *drv_data)
+static int __init init_queue(struct driver_data *drv_data)
 {
         INIT_LIST_HEAD(&drv_data->queue);
         spin_lock_init(&drv_data->lock);
@@ -1317,7 +1317,7 @@ static int destroy_queue(struct driver_data *drv_data)
         return 0;
 }
 
-static int pxa2xx_spi_probe(struct platform_device *pdev)
+static int __init pxa2xx_spi_probe(struct platform_device *pdev)
 {
         struct device *dev = &pdev->dev;
         struct pxa2xx_spi_master *platform_info;
@@ -1621,8 +1621,7 @@ static struct platform_driver driver = {
                 .bus = &platform_bus_type,
                 .owner = THIS_MODULE,
         },
-        .probe = pxa2xx_spi_probe,
-        .remove = __devexit_p(pxa2xx_spi_remove),
+        .remove = pxa2xx_spi_remove,
         .shutdown = pxa2xx_spi_shutdown,
         .suspend = pxa2xx_spi_suspend,
         .resume = pxa2xx_spi_resume,
@@ -1630,9 +1629,7 @@ static struct platform_driver driver = {
 
 static int __init pxa2xx_spi_init(void)
 {
-        platform_driver_register(&driver);
-
-        return 0;
+        return platform_driver_probe(&driver, pxa2xx_spi_probe);
 }
 module_init(pxa2xx_spi_init);