VIC dynamic PM

VIC dynamic PM

[Ben Dooks]

Quick patch that works on s3c6410 to change the vic to use kzalloc()
to allocate devices. I think that other architectures should be able
to use this too, but could other people please check about this?

If it is good for all, then comments on getting it merged for 2.6.36?

[PATCH] ARM: VIC: Allocate VIC PM device from slab

[Ben Dooks]

The original assertion about the inability to allocate the VIC device is
wrong, and that we have the ability to allocate memory when registering
the VIC (tested on s3c6400_defconfig with SMDK6410).

Change to allocating the device at init time, putting it on a list
instead of having a static array of vics.

Note, since this is just for the PM, it does not affect the exisiting
VIC operations.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
---
 arch/arm/common/vic.c |   35 ++++++++++++++++-------------------
 1 files changed, 16 insertions(+), 19 deletions(-)

diff --git a/arch/arm/common/vic.c b/arch/arm/common/vic.c
index ba65f6e..b1f1a9e 100644
--- a/arch/arm/common/vic.c
+++ b/arch/arm/common/vic.c
@@ -21,6 +21,7 @@
 
 #include <linux/init.h>
 #include <linux/list.h>
+#include <linux/slab.h>
 #include <linux/io.h>
 #include <linux/sysdev.h>
 #include <linux/device.h>
@@ -44,6 +45,7 @@
  */
 struct vic_device {
 	struct sys_device sysdev;
+	struct list_head list;
 
 	void __iomem	*base;
 	int		irq;
@@ -55,10 +57,7 @@ struct vic_device {
 	u32		protect;
 };
 
-/* we cannot allocate memory when VICs are initially registered */
-static struct vic_device vic_devices[CONFIG_ARM_VIC_NR];
-
-static int vic_id;
+static LIST_HEAD(vic_list);
 
 static inline struct vic_device *to_vic(struct sys_device *sys)
 {
@@ -147,11 +146,11 @@ struct sysdev_class vic_class = {
 */
 static int __init vic_pm_init(void)
 {
-	struct vic_device *dev = vic_devices;
+	struct vic_device *dev;
 	int err;
-	int id;
+	int id = 0;
 
-	if (vic_id == 0)
+	if (list_empty(&vic_list))
 		return 0;
 
 	err = sysdev_class_register(&vic_class);
@@ -160,8 +159,8 @@ static int __init vic_pm_init(void)
 		return err;
 	}
 
-	for (id = 0; id < vic_id; id++, dev++) {
-		dev->sysdev.id = id;
+	list_for_each_entry(dev, &vic_list, list) {
+		dev->sysdev.id = id++;
 		dev->sysdev.cls = &vic_class;
 
 		err = sysdev_register(&dev->sysdev);
@@ -190,15 +189,14 @@ static void __init vic_pm_register(void __iomem *base, unsigned int irq, u32 res
 {
 	struct vic_device *v;
 
-	if (vic_id >= ARRAY_SIZE(vic_devices))
-		printk(KERN_ERR "%s: too few VICs, increase CONFIG_ARM_VIC_NR\n", __func__);
-	else {
-		v = &vic_devices[vic_id];
+	v = kzalloc(sizeof(struct vic_device), GFP_KERNEL);
+	if (v) {
+		list_add_tail(&v->list, &vic_list);
 		v->base = base;
-		v->resume_sources = resume_sources;
 		v->irq = irq;
-		vic_id++;
-	}
+		v->resume_sources = resume_sources;
+	} else
+		printk(KERN_ERR "%s: cannot add vic at %p\n", __func__, base);
 }
 #else
 static inline void vic_pm_register(void __iomem *base, unsigned int irq, u32 arg1) { }
@@ -230,11 +228,10 @@ static void vic_unmask_irq(unsigned int irq)
 #if defined(CONFIG_PM)
 static struct vic_device *vic_from_irq(unsigned int irq)
 {
-        struct vic_device *v = vic_devices;
 	unsigned int base_irq = irq & ~31;
-	int id;
+	struct vic_device *v;
 
-	for (id = 0; id < vic_id; id++, v++) {
+	list_for_each_entry(v, &vic_list, list) {
 		if (v->irq == base_irq)
 			return v;
 	}
-- 
1.6.3.3