Staging: p9auth: fix up sparse warnings

Everything needs to be static, as sparse complains and you don't want to
polute the global kernel symbol namespace.  So mark everything as such
and move one function around to prevent a forward declaration from being
needed.

Cc: Ashwin Ganti <ashwin.ganti@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/p9auth/p9auth.c

@@ -61,13 +61,10 @@ struct cap_dev {
 	struct cdev cdev;
 };
 
-char *cap_hash(char *plain_text, unsigned int plain_text_size, char *key,
-	       unsigned int key_size);
-
-int cap_major = CAP_MAJOR;
-int cap_minor;
-int cap_nr_devs = CAP_NR_DEVS;
-int cap_node_size = CAP_NODE_SIZE;
+static int cap_major = CAP_MAJOR;
+static int cap_minor;
+static int cap_nr_devs = CAP_NR_DEVS;
+static int cap_node_size = CAP_NODE_SIZE;
 
 module_param(cap_major, int, S_IRUGO);
 module_param(cap_minor, int, S_IRUGO);
@@ -76,16 +73,65 @@ module_param(cap_nr_devs, int, S_IRUGO);
 MODULE_AUTHOR("Ashwin Ganti");
 MODULE_LICENSE("GPL");
 
-struct cap_dev *cap_devices;
+static struct cap_dev *cap_devices;
 
-void hexdump(unsigned char *buf, unsigned int len)
+static void hexdump(unsigned char *buf, unsigned int len)
 {
 	while (len--)
 		printk("%02x", *buf++);
 	printk("\n");
 }
 
-int cap_trim(struct cap_dev *dev)
+static char *cap_hash(char *plain_text, unsigned int plain_text_size,
+		      char *key, unsigned int key_size)
+{
+	struct scatterlist sg;
+	char *result = kmalloc(MAX_DIGEST_SIZE, GFP_KERNEL);
+	struct crypto_hash *tfm;
+	struct hash_desc desc;
+	int ret;
+
+	tfm = crypto_alloc_hash("hmac(sha1)", 0, CRYPTO_ALG_ASYNC);
+	if (IS_ERR(tfm)) {
+		printk(KERN_ERR
+		       "failed to load transform for hmac(sha1): %ld\n",
+		       PTR_ERR(tfm));
+		kfree(result);
+		return NULL;
+	}
+
+	desc.tfm = tfm;
+	desc.flags = 0;
+
+	memset(result, 0, MAX_DIGEST_SIZE);
+	sg_set_buf(&sg, plain_text, plain_text_size);
+
+	ret = crypto_hash_setkey(tfm, key, key_size);
+	if (ret) {
+		printk(KERN_ERR "setkey() failed ret=%d\n", ret);
+		kfree(result);
+		result = NULL;
+		goto out;
+	}
+
+	ret = crypto_hash_digest(&desc, &sg, plain_text_size, result);
+	if (ret) {
+		printk(KERN_ERR "digest () failed ret=%d\n", ret);
+		kfree(result);
+		result = NULL;
+		goto out;
+	}
+
+	printk(KERN_DEBUG "crypto hash digest size %d\n",
+	       crypto_hash_digestsize(tfm));
+	hexdump(result, MAX_DIGEST_SIZE);
+
+out:
+	crypto_free_hash(tfm);
+	return result;
+}
+
+static int cap_trim(struct cap_dev *dev)
 {
 	struct cap_node *tmp;
 	struct list_head *pos, *q;
@@ -99,7 +145,7 @@ int cap_trim(struct cap_dev *dev)
 	return 0;
 }
 
-int cap_open(struct inode *inode, struct file *filp)
+static int cap_open(struct inode *inode, struct file *filp)
 {
 	struct cap_dev *dev;
 	dev = container_of(inode->i_cdev, struct cap_dev, cdev);
@@ -120,13 +166,13 @@ int cap_open(struct inode *inode, struct file *filp)
 	return 0;
 }
 
-int cap_release(struct inode *inode, struct file *filp)
+static int cap_release(struct inode *inode, struct file *filp)
 {
 	return 0;
 }
 
-ssize_t cap_write(struct file *filp, const char __user *buf, size_t count,
-		  loff_t *f_pos)
+static ssize_t cap_write(struct file *filp, const char __user *buf,
+			 size_t count, loff_t *f_pos)
 {
 	struct cap_node *node_ptr, *tmp;
 	struct list_head *pos;
@@ -181,8 +227,7 @@ ssize_t cap_write(struct file *filp, const char __user *buf, size_t count,
 		printk(KERN_ALERT "the source user is %s \n", source_user);
 		printk(KERN_ALERT "the target user is %s \n", target_user);
 
-		result =
-		    cap_hash(hash_str, len, rand_str, strlen(rand_str));
+		result = cap_hash(hash_str, len, rand_str, strlen(rand_str));
 		if (NULL == result) {
 			retval = -EFAULT;
 			goto out;
@@ -266,15 +311,14 @@ out:
 	return retval;
 }
 
-const struct file_operations cap_fops = {
+static const struct file_operations cap_fops = {
 	.owner = THIS_MODULE,
 	.write = cap_write,
 	.open = cap_open,
 	.release = cap_release,
 };
 
-
-void cap_cleanup_module(void)
+static void cap_cleanup_module(void)
 {
 	int i;
 	dev_t devno = MKDEV(cap_major, cap_minor);
@@ -289,7 +333,6 @@ void cap_cleanup_module(void)
 
 }
 
-
 static void cap_setup_cdev(struct cap_dev *dev, int index)
 {
 	int err, devno = MKDEV(cap_major, cap_minor + index);
@@ -301,8 +344,7 @@ static void cap_setup_cdev(struct cap_dev *dev, int index)
 		printk(KERN_NOTICE "Error %d adding cap%d", err, index);
 }
 
-
-int cap_init_module(void)
+static int cap_init_module(void)
 {
 	int result, i;
 	dev_t dev = 0;
@@ -347,51 +389,4 @@ fail:
 module_init(cap_init_module);
 module_exit(cap_cleanup_module);
 
-char *cap_hash(char *plain_text, unsigned int plain_text_size,
-	       char *key, unsigned int key_size)
-{
-	struct scatterlist sg;
-	char *result = kmalloc(MAX_DIGEST_SIZE, GFP_KERNEL);
-	struct crypto_hash *tfm;
-	struct hash_desc desc;
-	int ret;
-
-	tfm = crypto_alloc_hash("hmac(sha1)", 0, CRYPTO_ALG_ASYNC);
-	if (IS_ERR(tfm)) {
-		printk(KERN_ERR
-		       "failed to load transform for hmac(sha1): %ld\n",
-		       PTR_ERR(tfm));
-		kfree(result);
-		return NULL;
-	}
-
-	desc.tfm = tfm;
-	desc.flags = 0;
-
-	memset(result, 0, MAX_DIGEST_SIZE);
-	sg_set_buf(&sg, plain_text, plain_text_size);
-
-	ret = crypto_hash_setkey(tfm, key, key_size);
-	if (ret) {
-		printk(KERN_ERR "setkey() failed ret=%d\n", ret);
-		kfree(result);
-		result = NULL;
-		goto out;
-	}
-
-	ret = crypto_hash_digest(&desc, &sg, plain_text_size, result);
-	if (ret) {
-		printk(KERN_ERR "digest () failed ret=%d\n", ret);
-		kfree(result);
-		result = NULL;
-		goto out;
-	}
-
-	printk(KERN_DEBUG "crypto hash digest size %d\n",
-	       crypto_hash_digestsize(tfm));
-	hexdump(result, MAX_DIGEST_SIZE);
 
-out:
-	crypto_free_hash(tfm);
-	return result;
-}