[PATCH 03/20] staging/lustre/ldlm: In ldlm_pools_fini make sure there was init first.

[green]

From: Oleg Drokin <green@xxxxxxxxxxxxxx>

It turns out if you call ldlm_pools_fini without completing the
ldlm_pools_init, then attempt to unregister not yet registered
shrinkers makes the kernel very unhappy.
So make sure we have them registered first.

Signed-off-by: Oleg Drokin <green@xxxxxxxxxxxxxx>
---
 drivers/staging/lustre/lustre/ldlm/ldlm_pool.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_pool.c b/drivers/staging/lustre/lustre/ldlm/ldlm_pool.c
index 1605b9c..251efb7 100644
--- a/drivers/staging/lustre/lustre/ldlm/ldlm_pool.c
+++ b/drivers/staging/lustre/lustre/ldlm/ldlm_pool.c
@@ -1486,8 +1486,10 @@ EXPORT_SYMBOL(ldlm_pools_init);
 
 void ldlm_pools_fini(void)
 {
-	unregister_shrinker(&ldlm_pools_srv_shrinker);
-	unregister_shrinker(&ldlm_pools_cli_shrinker);
+	if (ldlm_pools_thread) {
+		unregister_shrinker(&ldlm_pools_srv_shrinker);
+		unregister_shrinker(&ldlm_pools_cli_shrinker);
+	}
 	ldlm_pools_thread_stop();
 }
 EXPORT_SYMBOL(ldlm_pools_fini);
-- 
2.1.0

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