linux-kernel - Re: [PATCH 1/3] mm/zsmalloc: avoid unregister a NOT-registered zsmalloc zpool driver

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Date:	Fri, 14 Nov 2014 07:31:27 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Mahendran Ganesh <opensource.ganesh@...il.com>
Cc:	minchan@...nel.org, ngupta@...are.org, ddstreet@...e.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: [PATCH 1/3] mm/zsmalloc: avoid unregister a NOT-registered
 zsmalloc zpool driver

On (11/14/14 00:30), Sergey Senozhatsky wrote:
> Factor out zsmalloc cpu notifier unregistration code and call
> it from both zs_exit() and zs_init() error path.

I should had have a good sleep before posting this.
shame on me!

v3

Signed-ogg-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>

---

 mm/zsmalloc.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index b3b57ef..cd4efa1 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -881,14 +881,10 @@ static struct notifier_block zs_cpu_nb = {
 	.notifier_call = zs_cpu_notifier
 };
 
-static void zs_exit(void)
+static void zs_unregister_cpu_notifier(void)
 {
 	int cpu;
 
-#ifdef CONFIG_ZPOOL
-	zpool_unregister_driver(&zs_zpool_driver);
-#endif
-
 	cpu_notifier_register_begin();
 
 	for_each_online_cpu(cpu)
@@ -898,6 +894,14 @@ static void zs_exit(void)
 	cpu_notifier_register_done();
 }
 
+static void zs_exit(void)
+{
+#ifdef CONFIG_ZPOOL
+	zpool_unregister_driver(&zs_zpool_driver);
+#endif
+	zs_unregister_cpu_notifier();
+}
+
 static int zs_init(void)
 {
 	int cpu, ret;
@@ -921,7 +925,7 @@ static int zs_init(void)
 
 	return 0;
 fail:
-	zs_exit();
+	zs_unregister_cpu_notifier();
 	return notifier_to_errno(ret);
 }
 
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