--- zzzz-none-000/linux-3.10.107/drivers/scsi/bfa/bfad_debugfs.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/scsi/bfa/bfad_debugfs.c	2021-02-04 17:41:59.000000000 +0000
@@ -173,31 +173,9 @@
 static loff_t
 bfad_debugfs_lseek(struct file *file, loff_t offset, int orig)
 {
-	struct bfad_debug_info *debug;
-	loff_t pos = file->f_pos;
-
-	debug = file->private_data;
-
-	switch (orig) {
-	case 0:
-		file->f_pos = offset;
-		break;
-	case 1:
-		file->f_pos += offset;
-		break;
-	case 2:
-		file->f_pos = debug->buffer_len + offset;
-		break;
-	default:
-		return -EINVAL;
-	}
-
-	if (file->f_pos < 0 || file->f_pos > debug->buffer_len) {
-		file->f_pos = pos;
-		return -EINVAL;
-	}
-
-	return file->f_pos;
+	struct bfad_debug_info *debug = file->private_data;
+	return fixed_size_llseek(file, offset, orig,
+				debug->buffer_len);
 }
 
 static ssize_t
@@ -282,18 +260,9 @@
 	unsigned long flags;
 	void *kern_buf;
 
-	kern_buf = kzalloc(nbytes, GFP_KERNEL);
-
-	if (!kern_buf) {
-		printk(KERN_INFO "bfad[%d]: Failed to allocate buffer\n",
-				bfad->inst_no);
-		return -ENOMEM;
-	}
-
-	if (copy_from_user(kern_buf, (void  __user *)buf, nbytes)) {
-		kfree(kern_buf);
-		return -ENOMEM;
-	}
+	kern_buf = memdup_user(buf, nbytes);
+	if (IS_ERR(kern_buf))
+		return PTR_ERR(kern_buf);
 
 	rc = sscanf(kern_buf, "%x:%x", &addr, &len);
 	if (rc < 2) {
@@ -358,18 +327,9 @@
 	unsigned long flags;
 	void *kern_buf;
 
-	kern_buf = kzalloc(nbytes, GFP_KERNEL);
-
-	if (!kern_buf) {
-		printk(KERN_INFO "bfad[%d]: Failed to allocate buffer\n",
-				bfad->inst_no);
-		return -ENOMEM;
-	}
-
-	if (copy_from_user(kern_buf, (void  __user *)buf, nbytes)) {
-		kfree(kern_buf);
-		return -ENOMEM;
-	}
+	kern_buf = memdup_user(buf, nbytes);
+	if (IS_ERR(kern_buf))
+		return PTR_ERR(kern_buf);
 
 	rc = sscanf(kern_buf, "%x:%x", &addr, &val);
 	if (rc < 2) {