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authorMaxim Shchetynin <maxim@de.ibm.com>2008-07-16 05:51:41 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-07-22 10:39:31 +1000
commit9a23409b69440e76d34dc23846cae44f46f60d98 (patch)
tree77b164c7a07f9e2edfd5efc71b79a986ed3071df
parent18ad7a61e1b700dfe177fabf1c350b4f5d4da8ac (diff)
downloadop-kernel-dev-9a23409b69440e76d34dc23846cae44f46f60d98.zip
op-kernel-dev-9a23409b69440e76d34dc23846cae44f46f60d98.tar.gz
powerpc/axonram: Use only one block device major number
Axonram module registers one block device for each DDR2 DIMM found on a system. This means that each DDR2 DIMM becomes its own block device major number. This patch lets axonram module to register the only one block device for all DDR2 DIMMs which also spares kernel resources. Signed-off-by: Maxim Shchetynin <maxim@de.ibm.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
-rw-r--r--arch/powerpc/sysdev/axonram.c23
1 files changed, 15 insertions, 8 deletions
diff --git a/arch/powerpc/sysdev/axonram.c b/arch/powerpc/sysdev/axonram.c
index 7f59188..9b639ed 100644
--- a/arch/powerpc/sysdev/axonram.c
+++ b/arch/powerpc/sysdev/axonram.c
@@ -57,6 +57,8 @@
#define AXON_RAM_SECTOR_SIZE 1 << AXON_RAM_SECTOR_SHIFT
#define AXON_RAM_IRQ_FLAGS IRQF_SHARED | IRQF_TRIGGER_RISING
+static int azfs_major, azfs_minor;
+
struct axon_ram_bank {
struct of_device *device;
struct gendisk *disk;
@@ -227,19 +229,14 @@ axon_ram_probe(struct of_device *device, const struct of_device_id *device_id)
goto failed;
}
- bank->disk->first_minor = 0;
+ bank->disk->major = azfs_major;
+ bank->disk->first_minor = azfs_minor;
bank->disk->fops = &axon_ram_devops;
bank->disk->private_data = bank;
bank->disk->driverfs_dev = &device->dev;
sprintf(bank->disk->disk_name, "%s%d",
AXON_RAM_DEVICE_NAME, axon_ram_bank_id);
- bank->disk->major = register_blkdev(0, bank->disk->disk_name);
- if (bank->disk->major < 0) {
- dev_err(&device->dev, "Cannot register block device\n");
- rc = -EFAULT;
- goto failed;
- }
bank->disk->queue = blk_alloc_queue(GFP_KERNEL);
if (bank->disk->queue == NULL) {
@@ -276,6 +273,8 @@ axon_ram_probe(struct of_device *device, const struct of_device_id *device_id)
goto failed;
}
+ azfs_minor += bank->disk->minors;
+
return 0;
failed:
@@ -310,7 +309,6 @@ axon_ram_remove(struct of_device *device)
device_remove_file(&device->dev, &dev_attr_ecc);
free_irq(bank->irq_id, device);
- unregister_blkdev(bank->disk->major, bank->disk->disk_name);
del_gendisk(bank->disk);
iounmap((void __iomem *) bank->io_addr);
kfree(bank);
@@ -341,6 +339,14 @@ static struct of_platform_driver axon_ram_driver = {
static int __init
axon_ram_init(void)
{
+ azfs_major = register_blkdev(azfs_major, AXON_RAM_DEVICE_NAME);
+ if (azfs_major < 0) {
+ printk(KERN_ERR "%s cannot become block device major number\n",
+ AXON_RAM_MODULE_NAME);
+ return -EFAULT;
+ }
+ azfs_minor = 0;
+
return of_register_platform_driver(&axon_ram_driver);
}
@@ -351,6 +357,7 @@ static void __exit
axon_ram_exit(void)
{
of_unregister_platform_driver(&axon_ram_driver);
+ unregister_blkdev(azfs_major, AXON_RAM_DEVICE_NAME);
}
module_init(axon_ram_init);
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