linux-kernel - [PATCH] staging: lustre: simplify ptlrpc_deactivate_and_unlock

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Date:	Mon, 17 Aug 2015 14:04:49 +0200
From:	Maxime Lorrillere <maxime.lorrillere@...il.com>
To:	Oleg Drokin <oleg.drokin@...el.com>,
	Andreas Dilger <andreas.dilger@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org,
	Maxime Lorrillere <maxime.lorrillere@...il.com>
Subject: [PATCH] staging: lustre: simplify ptlrpc_deactivate_and_unlock_import

The locking scheme used in ptlrpc_deactivate_and_unlock_import and
ptlrpc_deactivate_import generates the followings sparse errors:
drivers/staging/lustre/lustre/ptlrpc/import.c:209:9: warning: context
imbalance in 'ptlrpc_deactivate_and_unlock_import' - unexpected unlock
drivers/staging/lustre/lustre/ptlrpc/import.c:221:6: warning: context
imbalance in 'ptlrpc_deactivate_import' - wrong count at exit

As ptlrpc_deactivate_and_unlock_import is only used by
ptlrpc_deactivate_import as a helper function, this patch moves its code
into ptlrpc_deactivatre_import to fix the sparse warnings.

Signed-off-by: Maxime Lorrillere <maxime.lorrillere@...il.com>
---
 drivers/staging/lustre/lustre/ptlrpc/import.c | 21 +++++++--------------
 1 file changed, 7 insertions(+), 14 deletions(-)

diff --git a/drivers/staging/lustre/lustre/ptlrpc/import.c b/drivers/staging/lustre/lustre/ptlrpc/import.c
index 1eae389..1fd8510 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/import.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/import.c
@@ -200,12 +200,15 @@ int ptlrpc_set_import_discon(struct obd_import *imp, __u32 conn_cnt)
 	return rc;
 }
 
-/* Must be called with imp_lock held! */
-static void ptlrpc_deactivate_and_unlock_import(struct obd_import *imp)
+/*
+ * This acts as a barrier; all existing requests are rejected, and
+ * no new requests will be accepted until the import is valid again.
+ */
+void ptlrpc_deactivate_import(struct obd_import *imp)
 {
-	assert_spin_locked(&imp->imp_lock);
-
 	CDEBUG(D_HA, "setting import %s INVALID\n", obd2cli_tgt(imp->imp_obd));
+
+	spin_lock(&imp->imp_lock);
 	imp->imp_invalid = 1;
 	imp->imp_generation++;
 	spin_unlock(&imp->imp_lock);
@@ -213,16 +216,6 @@ static void ptlrpc_deactivate_and_unlock_import(struct obd_import *imp)
 	ptlrpc_abort_inflight(imp);
 	obd_import_event(imp->imp_obd, imp, IMP_EVENT_INACTIVE);
 }
-
-/*
- * This acts as a barrier; all existing requests are rejected, and
- * no new requests will be accepted until the import is valid again.
- */
-void ptlrpc_deactivate_import(struct obd_import *imp)
-{
-	spin_lock(&imp->imp_lock);
-	ptlrpc_deactivate_and_unlock_import(imp);
-}
 EXPORT_SYMBOL(ptlrpc_deactivate_import);
 
 static unsigned int
-- 
2.5.0

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