xfs: cleanup xfs_qm_dqlookup

Rearrange the code to avoid the conditional locking around the flist_locked
variable.  This means we lose a (rather pointless) assert, and hold the
freelist lock a bit longer for one corner case.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

fs/xfs/xfs_dquot.c

@@ -710,12 +710,9 @@ xfs_qm_dqlookup(
 	xfs_dquot_t		**O_dqpp)
 {
 	xfs_dquot_t		*dqp;
-	uint			flist_locked;
 
 	ASSERT(mutex_is_locked(&qh->qh_lock));
 
-	flist_locked = B_FALSE;
-
 	/*
 	 * Traverse the hashchain looking for a match
 	 */
@@ -750,31 +747,19 @@ xfs_qm_dqlookup(
 					xfs_dqlock(dqp);
 					dqp->dq_flags &= ~(XFS_DQ_WANT);
 				}
-				flist_locked = B_TRUE;
-			}
-
-			/*
-			 * id couldn't have changed; we had the hashlock all
-			 * along
-			 */
-			ASSERT(be32_to_cpu(dqp->q_core.d_id) == id);
 
-			if (flist_locked) {
-				if (dqp->q_nrefs != 0) {
-					mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
-					flist_locked = B_FALSE;
-				} else {
+				if (dqp->q_nrefs == 0) {
 					/* take it off the freelist */
 					trace_xfs_dqlookup_freelist(dqp);
 					list_del_init(&dqp->q_freelist);
 					xfs_Gqm->qm_dqfrlist_cnt--;
 				}
+				XFS_DQHOLD(dqp);
+				mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
+			} else {
+				XFS_DQHOLD(dqp);
 			}
 
-			XFS_DQHOLD(dqp);
-
-			if (flist_locked)
-				mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
 			/*
 			 * move the dquot to the front of the hashchain
 			 */