linux-kernel - [PATCH] [v2] nvdimm-btt: simplify code with the scope based resource management

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Message-Id: <20231214083919.22218-1-dinghao.liu@zju.edu.cn>
Date:   Thu, 14 Dec 2023 16:39:19 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Ira Weiny <ira.weiny@...el.com>, nvdimm@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: [PATCH] [v2] nvdimm-btt: simplify code with the scope based resource management

Use the scope based resource management (defined in
linux/cleanup.h) to automate resource lifetime
control on struct btt_sb *super in discover_arenas().

Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
---

Changelog:

v2: Set the __free attribute before kzalloc.
---
 drivers/nvdimm/btt.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index d5593b0dc700..32a9e2f543c5 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -16,6 +16,7 @@
 #include <linux/fs.h>
 #include <linux/nd.h>
 #include <linux/backing-dev.h>
+#include <linux/cleanup.h>
 #include "btt.h"
 #include "nd.h"
 
@@ -847,23 +848,20 @@ static int discover_arenas(struct btt *btt)
 {
 	int ret = 0;
 	struct arena_info *arena;
-	struct btt_sb *super;
 	size_t remaining = btt->rawsize;
 	u64 cur_nlba = 0;
 	size_t cur_off = 0;
 	int num_arenas = 0;
 
-	super = kzalloc(sizeof(*super), GFP_KERNEL);
+	struct btt_sb *super __free(kfree) = kzalloc(sizeof(*super), GFP_KERNEL);
 	if (!super)
 		return -ENOMEM;
 
 	while (remaining) {
 		/* Alloc memory for arena */
 		arena = alloc_arena(btt, 0, 0, 0);
-		if (!arena) {
-			ret = -ENOMEM;
-			goto out_super;
-		}
+		if (!arena)
+			return -ENOMEM;
 
 		arena->infooff = cur_off;
 		ret = btt_info_read(arena, super);
@@ -919,14 +917,11 @@ static int discover_arenas(struct btt *btt)
 	btt->nlba = cur_nlba;
 	btt->init_state = INIT_READY;
 
-	kfree(super);
 	return ret;
 
  out:
 	kfree(arena);
 	free_arenas(btt);
- out_super:
-	kfree(super);
 	return ret;
 }
 
-- 
2.17.1