From d5ee8e750c9449e9849a09ce6fb6b8adeaa66adc Mon Sep 17 00:00:00 2001
From: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Date: Tue, 20 Jul 2021 11:05:11 -0400
Subject: padata: Convert from atomic_t to refcount_t on parallel_data->refcnt

refcount_t type and corresponding API can protect refcounters from
accidental underflow and overflow and further use-after-free situations.

Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Acked-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---
 include/linux/padata.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'include/linux/padata.h')

diff --git a/include/linux/padata.h b/include/linux/padata.h
index a433f13fc4bf..495b16b6b4d7 100644
--- a/include/linux/padata.h
+++ b/include/linux/padata.h
@@ -12,6 +12,7 @@
 #ifndef PADATA_H
 #define PADATA_H
 
+#include <linux/refcount.h>
 #include <linux/compiler_types.h>
 #include <linux/workqueue.h>
 #include <linux/spinlock.h>
@@ -96,7 +97,7 @@ struct parallel_data {
 	struct padata_shell		*ps;
 	struct padata_list		__percpu *reorder_list;
 	struct padata_serial_queue	__percpu *squeue;
-	atomic_t			refcnt;
+	refcount_t			refcnt;
 	unsigned int			seq_nr;
 	unsigned int			processed;
 	int				cpu;
-- 
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