From: Nicolai Stange <nicstange@gmail.com>
Date: Tue, 31 Oct 2017 00:15:51 +0100
Subject: IB/hfi1: convert to debugfs_file_get() and -put()
Patch-mainline: v4.15-rc1
Git-commit: 7cda7b8f97da9382bb945d541a85cde58d5dac27
References: bsc#1114685 FATE#325854

Convert all calls to the now obsolete debugfs_use_file_start() and
debugfs_use_file_finish() to the new debugfs_file_get() and
debugfs_file_put() API.

Fixes: 49d200deaa68 ("debugfs: prevent access to removed files' private data")
Signed-off-by: Nicolai Stange <nicstange@gmail.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/infiniband/hw/hfi1/debugfs.c |   20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

--- a/drivers/infiniband/hw/hfi1/debugfs.c
+++ b/drivers/infiniband/hw/hfi1/debugfs.c
@@ -71,13 +71,13 @@ static ssize_t hfi1_seq_read(
 	loff_t *ppos)
 {
 	struct dentry *d = file->f_path.dentry;
-	int srcu_idx;
 	ssize_t r;
 
-	r = debugfs_use_file_start(d, &srcu_idx);
-	if (likely(!r))
-		r = seq_read(file, buf, size, ppos);
-	debugfs_use_file_finish(srcu_idx);
+	r = debugfs_file_get(d);
+	if (unlikely(r))
+		return r;
+	r = seq_read(file, buf, size, ppos);
+	debugfs_file_put(d);
 	return r;
 }
 
@@ -87,13 +87,13 @@ static loff_t hfi1_seq_lseek(
 	int whence)
 {
 	struct dentry *d = file->f_path.dentry;
-	int srcu_idx;
 	loff_t r;
 
-	r = debugfs_use_file_start(d, &srcu_idx);
-	if (likely(!r))
-		r = seq_lseek(file, offset, whence);
-	debugfs_use_file_finish(srcu_idx);
+	r = debugfs_file_get(d);
+	if (unlikely(r))
+		return r;
+	r = seq_lseek(file, offset, whence);
+	debugfs_file_put(d);
 	return r;
 }