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zsmalloc: fix zs_init cpu notifier error handling

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Mahendran Ganesh reported that zpool-enabled zsmalloc should not call
zpool_unregister_driver() from zs_init() if cpu notifier registration has
failed, because error handling is performed before we register the driver
via zpool_register_driver() call.

Factor out cpu notifier registration and unregistration code and fix
zs_init() error handling.

link: http://lkml.iu.edu//hypermail/linux/kernel/1411.1/04156.html
[akpm@linux-foundation.org: squash bogus gcc warning]
[akpm@linux-foundation.org: use __init and __exit]
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Reported-by: Mahendran Ganesh <opensource.ganesh@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sergey Senozhatsky 2014-12-12 16:56:56 -08:00 committed by Linus Torvalds
parent 8c7f01025f
commit b1b00a5b8a
1 changed files with 24 additions and 15 deletions
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39
mm/zsmalloc.c
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@ -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)
@ -898,31 +894,44 @@ static void zs_exit(void)
cpu_notifier_register_done();
}
static int zs_init(void)
static int zs_register_cpu_notifier(void)
{
int cpu, ret;
int cpu, uninitialized_var(ret);
cpu_notifier_register_begin();
__register_cpu_notifier(&zs_cpu_nb);
for_each_online_cpu(cpu) {
ret = zs_cpu_notifier(NULL, CPU_UP_PREPARE, (void *)(long)cpu);
if (notifier_to_errno(ret)) {
cpu_notifier_register_done();
goto fail;
}
if (notifier_to_errno(ret))
break;
}
cpu_notifier_register_done();
return notifier_to_errno(ret);
}
static void __exit zs_exit(void)
{
#ifdef CONFIG_ZPOOL
zpool_unregister_driver(&zs_zpool_driver);
#endif
zs_unregister_cpu_notifier();
}
static int __init zs_init(void)
{
int ret = zs_register_cpu_notifier();
if (ret) {
zs_unregister_cpu_notifier();
return ret;
}
#ifdef CONFIG_ZPOOL
zpool_register_driver(&zs_zpool_driver);
#endif
return 0;
fail:
zs_exit();
return notifier_to_errno(ret);
}
static unsigned int get_maxobj_per_zspage(int size, int pages_per_zspage)