powerpc: Adopt nvram module for PPC64

Adopt nvram module to reduce code duplication. This means CONFIG_NVRAM
becomes available to PPC64 builds. Previously it was only available to
PPC32 builds because it depended on CONFIG_GENERIC_NVRAM.

The IOC_NVRAM_GET_OFFSET ioctl as implemented on PPC64 validates the
offset returned by pmac_get_partition(). Do the same in the nvram module.

Note that the old PPC32 generic_nvram module lacked this test.
So when CONFIG_PPC32 && CONFIG_PPC_PMAC, the IOC_NVRAM_GET_OFFSET ioctl
would have returned 0 (always). But when CONFIG_PPC64 && CONFIG_PPC_PMAC,
the IOC_NVRAM_GET_OFFSET ioctl would have returned -1 (which is -EPERM)
when the requested partition was not found.

With this patch, the result is now -EINVAL on both PPC32 and PPC64 when
the requested PowerMac NVRAM partition is not found. This is a userspace-
visible change, in the non-existent partition case, which would be in
an error path for an IOC_NVRAM_GET_OFFSET ioctl syscall.

Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 156 deletions

diff --git a/arch/powerpc/kernel/nvram_64.c b/arch/powerpc/kernel/nvram_64.c
index 38b03a330cd2..244d2462e781 100644
--- a/arch/powerpc/kernel/nvram_64.c
+++ b/arch/powerpc/kernel/nvram_64.c
@@ -7,12 +7,6 @@
  *      2 of the License, or (at your option) any later version.
  *
  * /dev/nvram driver for PPC64
- *
- * This perhaps should live in drivers/char
- *
- * TODO: Split the /dev/nvram part (that one can use
- *       drivers/char/generic_nvram.c) from the arch & partition
- *       parsing code.
  */
 
 #include <linux/types.h>
@@ -714,137 +708,6 @@ static void oops_to_nvram(struct kmsg_dumper *dumper,
 	spin_unlock_irqrestore(&lock, flags);
 }
 
-static loff_t dev_nvram_llseek(struct file *file, loff_t offset, int origin)
-{
-	if (ppc_md.nvram_size == NULL)
-		return -ENODEV;
-	return generic_file_llseek_size(file, offset, origin, MAX_LFS_FILESIZE,
-					ppc_md.nvram_size());
-}
-
-
-static ssize_t dev_nvram_read(struct file *file, char __user *buf,
-			  size_t count, loff_t *ppos)
-{
-	ssize_t ret;
-	char *tmp = NULL;
-	ssize_t size;
-
-	if (!ppc_md.nvram_size) {
-		ret = -ENODEV;
-		goto out;
-	}
-
-	size = ppc_md.nvram_size();
-	if (size < 0) {
-		ret = size;
-		goto out;
-	}
-
-	if (*ppos >= size) {
-		ret = 0;
-		goto out;
-	}
-
-	count = min_t(size_t, count, size - *ppos);
-	count = min(count, PAGE_SIZE);
-
-	tmp = kmalloc(count, GFP_KERNEL);
-	if (!tmp) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	ret = ppc_md.nvram_read(tmp, count, ppos);
-	if (ret <= 0)
-		goto out;
-
-	if (copy_to_user(buf, tmp, ret))
-		ret = -EFAULT;
-
-out:
-	kfree(tmp);
-	return ret;
-
-}
-
-static ssize_t dev_nvram_write(struct file *file, const char __user *buf,
-			  size_t count, loff_t *ppos)
-{
-	ssize_t ret;
-	char *tmp = NULL;
-	ssize_t size;
-
-	ret = -ENODEV;
-	if (!ppc_md.nvram_size)
-		goto out;
-
-	ret = 0;
-	size = ppc_md.nvram_size();
-	if (*ppos >= size || size < 0)
-		goto out;
-
-	count = min_t(size_t, count, size - *ppos);
-	count = min(count, PAGE_SIZE);
-
-	tmp = memdup_user(buf, count);
-	if (IS_ERR(tmp)) {
-		ret = PTR_ERR(tmp);
-		goto out;
-	}
-
-	ret = ppc_md.nvram_write(tmp, count, ppos);
-
-	kfree(tmp);
-out:
-	return ret;
-}
-
-static long dev_nvram_ioctl(struct file *file, unsigned int cmd,
-			    unsigned long arg)
-{
-	switch(cmd) {
-#ifdef CONFIG_PPC_PMAC
-	case OBSOLETE_PMAC_NVRAM_GET_OFFSET:
-		printk(KERN_WARNING "nvram: Using obsolete PMAC_NVRAM_GET_OFFSET ioctl\n");
-		/* fall through */
-	case IOC_NVRAM_GET_OFFSET: {
-		int part, offset;
-
-		if (!machine_is(powermac))
-			return -EINVAL;
-		if (copy_from_user(&part, (void __user*)arg, sizeof(part)) != 0)
-			return -EFAULT;
-		if (part < pmac_nvram_OF || part > pmac_nvram_NR)
-			return -EINVAL;
-		offset = pmac_get_partition(part);
-		if (offset < 0)
-			return offset;
-		if (copy_to_user((void __user*)arg, &offset, sizeof(offset)) != 0)
-			return -EFAULT;
-		return 0;
-	}
-#endif /* CONFIG_PPC_PMAC */
-	default:
-		return -EINVAL;
-	}
-}
-
-static const struct file_operations nvram_fops = {
-	.owner		= THIS_MODULE,
-	.llseek		= dev_nvram_llseek,
-	.read		= dev_nvram_read,
-	.write		= dev_nvram_write,
-	.unlocked_ioctl	= dev_nvram_ioctl,
-};
-
-static struct miscdevice nvram_dev = {
-	NVRAM_MINOR,
-	"nvram",
-	&nvram_fops
-};
-
-
 #ifdef DEBUG_NVRAM
 static void __init nvram_print_partitions(char * label)
 {
@@ -992,6 +855,8 @@ loff_t __init nvram_create_partition(const char *name, int sig,
 	long size = 0;
 	int rc;
 
+	BUILD_BUG_ON(NVRAM_BLOCK_LEN != 16);
+
 	/* Convert sizes from bytes to blocks */
 	req_size = _ALIGN_UP(req_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN;
 	min_size = _ALIGN_UP(min_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN;
@@ -1192,22 +1057,3 @@ int __init nvram_scan_partitions(void)
 	kfree(header);
 	return err;
 }
-
-static int __init nvram_init(void)
-{
-	int rc;
-	
-	BUILD_BUG_ON(NVRAM_BLOCK_LEN != 16);
-
-	if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0)
-		return  -ENODEV;
-
-  	rc = misc_register(&nvram_dev);
-	if (rc != 0) {
-		printk(KERN_ERR "nvram_init: failed to register device\n");
-		return rc;
-	}
-  	
-  	return rc;
-}
-device_initcall(nvram_init);