[PATCH v2 1/2] staging: lustre: check result of register_shrinker

[Aliaksei Karaliou <akaraliou.dev@xxxxxxxxx>]

Lustre code lacks checking the result of register_shrinker()
in several places. register_shrinker() was tagged __must_check
recently so that sparse has started reporting it.

Signed-off-by: Aliaksei Karaliou <akaraliou.dev@xxxxxxxxx>
---
 drivers/staging/lustre/lustre/ldlm/ldlm_pool.c     | 12 +++++++++---
 drivers/staging/lustre/lustre/obdclass/lu_object.c |  5 +++--
 drivers/staging/lustre/lustre/osc/osc_request.c    |  4 +++-
 drivers/staging/lustre/lustre/ptlrpc/sec_bulk.c    |  8 +++++++-
 4 files changed, 22 insertions(+), 7 deletions(-)

v2: Style fixes, as suggested by Cheers, Andreas and Dan Carpenter.
    Added one more patch to address resource cleanup, suggested by Dan Carpenter.

diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_pool.c b/drivers/staging/lustre/lustre/ldlm/ldlm_pool.c
index da65d00a7811..9fef2d52d6c2 100644
--- a/drivers/staging/lustre/lustre/ldlm/ldlm_pool.c
+++ b/drivers/staging/lustre/lustre/ldlm/ldlm_pool.c
@@ -1086,10 +1086,16 @@ int ldlm_pools_init(void)
 	int rc;
 
 	rc = ldlm_pools_thread_start();
-	if (rc == 0)
-		register_shrinker(&ldlm_pools_cli_shrinker);
+	if (rc)
+		return rc;
 
-	return rc;
+	rc = register_shrinker(&ldlm_pools_cli_shrinker);
+	if (rc) {
+		ldlm_pools_thread_stop();
+		return rc;
+	}
+
+	return 0;
 }
 
 void ldlm_pools_fini(void)
diff --git a/drivers/staging/lustre/lustre/obdclass/lu_object.c b/drivers/staging/lustre/lustre/obdclass/lu_object.c
index b938a3f9d50a..9e0256ca2079 100644
--- a/drivers/staging/lustre/lustre/obdclass/lu_object.c
+++ b/drivers/staging/lustre/lustre/obdclass/lu_object.c
@@ -1951,7 +1951,7 @@ int lu_global_init(void)
 	 * inode, one for ea. Unfortunately setting this high value results in
 	 * lu_object/inode cache consuming all the memory.
 	 */
-	register_shrinker(&lu_site_shrinker);
+	result = register_shrinker(&lu_site_shrinker);
 
 	return result;
 }
@@ -1961,7 +1961,8 @@ int lu_global_init(void)
  */
 void lu_global_fini(void)
 {
-	unregister_shrinker(&lu_site_shrinker);
+	if (lu_site_shrinker.nr_deferred)
+		unregister_shrinker(&lu_site_shrinker);
 	lu_context_key_degister(&lu_global_key);
 
 	/*
diff --git a/drivers/staging/lustre/lustre/osc/osc_request.c b/drivers/staging/lustre/lustre/osc/osc_request.c
index 53eda4c99142..45b1ebf33363 100644
--- a/drivers/staging/lustre/lustre/osc/osc_request.c
+++ b/drivers/staging/lustre/lustre/osc/osc_request.c
@@ -2844,7 +2844,9 @@ static int __init osc_init(void)
 	if (rc)
 		goto out_kmem;
 
-	register_shrinker(&osc_cache_shrinker);
+	rc = register_shrinker(&osc_cache_shrinker);
+	if (rc)
+		goto out_type;
 
 	/* This is obviously too much memory, only prevent overflow here */
 	if (osc_reqpool_mem_max >= 1 << 12 || osc_reqpool_mem_max == 0) {
diff --git a/drivers/staging/lustre/lustre/ptlrpc/sec_bulk.c b/drivers/staging/lustre/lustre/ptlrpc/sec_bulk.c
index 77a3721beaee..485e7f15d850 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/sec_bulk.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/sec_bulk.c
@@ -396,6 +396,8 @@ static struct shrinker pools_shrinker = {
 
 int sptlrpc_enc_pool_init(void)
 {
+	int rc;
+
 	/*
 	 * maximum capacity is 1/8 of total physical memory.
 	 * is the 1/8 a good number?
@@ -432,7 +434,11 @@ int sptlrpc_enc_pool_init(void)
 	if (!page_pools.epp_pools)
 		return -ENOMEM;
 
-	register_shrinker(&pools_shrinker);
+	rc = register_shrinker(&pools_shrinker);
+	if (rc) {
+		enc_pools_free();
+		return rc;
+	}
 
 	return 0;
 }
-- 
2.11.0

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