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@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/lustre/lustre/ptlrpc/import.c b/drivers/staging/lustre/lustre/ptlrpc/import.c
index 1eae3896c0375ce6f2d7ed0c6856b000f2a487f3..1fd85104bd9d5a4d35baffed87c6bc07a159ecd1 100644 (file)
--- 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