--- zzzz-none-000/linux-3.10.107/drivers/pci/hotplug/cpqphp_sysfs.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/pci/hotplug/cpqphp_sysfs.c	2021-02-04 17:41:59.000000000 +0000
@@ -79,7 +79,7 @@
 
 static int show_dev (struct controller *ctrl, char *buf)
 {
-	char * out = buf;
+	char *out = buf;
 	int index;
 	struct pci_resource *res;
 	struct pci_func *new_slot;
@@ -167,26 +167,8 @@
 
 static loff_t lseek(struct file *file, loff_t off, int whence)
 {
-	struct ctrl_dbg *dbg;
-	loff_t new = -1;
-
-	mutex_lock(&cpqphp_mutex);
-	dbg = file->private_data;
-
-	switch (whence) {
-	case 0:
-		new = off;
-		break;
-	case 1:
-		new = file->f_pos + off;
-		break;
-	}
-	if (new < 0 || new > dbg->size) {
-		mutex_unlock(&cpqphp_mutex);
-		return -EINVAL;
-	}
-	mutex_unlock(&cpqphp_mutex);
-	return (file->f_pos = new);
+	struct ctrl_dbg *dbg = file->private_data;
+	return fixed_size_llseek(file, off, whence, dbg->size);
 }
 
 static ssize_t read(struct file *file, char __user *buf,
@@ -234,8 +216,7 @@
 
 void cpqhp_remove_debugfs_files(struct controller *ctrl)
 {
-	if (ctrl->dentry)
-		debugfs_remove(ctrl->dentry);
+	debugfs_remove(ctrl->dentry);
 	ctrl->dentry = NULL;
 }