1 files changed, 12 insertions, 3 deletions

diff --git a/drivers/oprofile/oprofile_files.c b/drivers/oprofile/oprofile_files.c
index bbd7516e086..89f63456646 100644
--- a/drivers/oprofile/oprofile_files.c
+++ b/drivers/oprofile/oprofile_files.c
@@ -59,6 +59,7 @@ static ssize_t timeout_write(struct file *file, char const __user *buf,
 static const struct file_operations timeout_fops = {
 	.read		= timeout_read,
 	.write		= timeout_write,
+	.llseek		= default_llseek,
 };
 
 #endif
@@ -79,21 +80,25 @@ static ssize_t depth_write(struct file *file, char const __user *buf, size_t cou
 	if (*offset)
 		return -EINVAL;
 
+	if (!oprofile_ops.backtrace)
+		return -EINVAL;
+
 	retval = oprofilefs_ulong_from_user(&val, buf, count);
 	if (retval)
 		return retval;
 
-	retval = oprofile_set_backtrace(val);
-
+	retval = oprofile_set_ulong(&oprofile_backtrace_depth, val);
 	if (retval)
 		return retval;
+
 	return count;
 }
 
 
 static const struct file_operations depth_fops = {
 	.read		= depth_read,
-	.write		= depth_write
+	.write		= depth_write,
+	.llseek		= default_llseek,
 };
 
 
@@ -105,6 +110,7 @@ static ssize_t pointer_size_read(struct file *file, char __user *buf, size_t cou
 
 static const struct file_operations pointer_size_fops = {
 	.read		= pointer_size_read,
+	.llseek		= default_llseek,
 };
 
 
@@ -116,6 +122,7 @@ static ssize_t cpu_type_read(struct file *file, char __user *buf, size_t count,
 
 static const struct file_operations cpu_type_fops = {
 	.read		= cpu_type_read,
+	.llseek		= default_llseek,
 };
 
 
@@ -151,6 +158,7 @@ static ssize_t enable_write(struct file *file, char const __user *buf, size_t co
 static const struct file_operations enable_fops = {
 	.read		= enable_read,
 	.write		= enable_write,
+	.llseek		= default_llseek,
 };
 
 
@@ -163,6 +171,7 @@ static ssize_t dump_write(struct file *file, char const __user *buf, size_t coun
 
 static const struct file_operations dump_fops = {
 	.write		= dump_write,
+	.llseek		= noop_llseek,
 };
 
 void oprofile_create_files(struct super_block *sb, struct dentry *root)