From 00c2bf85d8febfcfddde63822043462b026134ff Mon Sep 17 00:00:00 2001 From: Nadia Derbey Date: Fri, 25 Jul 2008 01:48:03 -0700 Subject: ipc: get rid of ipc_lock_down() Remove the ipc_lock_down() routines: they used to call idr_find() locklessly (given that the ipc ids lock was already held), so they are not needed anymore. Signed-off-by: Nadia Derbey Acked-by: "Paul E. McKenney" Cc: Manfred Spraul Cc: Jim Houston Cc: Pierre Peiffer Acked-by: Rik van Riel Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- ipc/util.c | 52 +--------------------------------------------------- 1 file changed, 1 insertion(+), 51 deletions(-) (limited to 'ipc/util.c') diff --git a/ipc/util.c b/ipc/util.c index 0f468c34e83c..49b3ea615dc5 100644 --- a/ipc/util.c +++ b/ipc/util.c @@ -716,56 +716,6 @@ struct kern_ipc_perm *ipc_lock(struct ipc_ids *ids, int id) return out; } -/** - * ipc_lock_down - Lock an ipc structure with rw_sem held - * @ids: IPC identifier set - * @id: ipc id to look for - * - * Look for an id in the ipc ids idr and lock the associated ipc object. - * - * The ipc object is locked on exit. - * - * This is the routine that should be called when the rw_mutex is already - * held, i.e. idr tree protected. - */ - -struct kern_ipc_perm *ipc_lock_down(struct ipc_ids *ids, int id) -{ - struct kern_ipc_perm *out; - int lid = ipcid_to_idx(id); - - rcu_read_lock(); - out = idr_find(&ids->ipcs_idr, lid); - if (out == NULL) { - rcu_read_unlock(); - return ERR_PTR(-EINVAL); - } - - spin_lock(&out->lock); - - /* - * No need to verify that the structure is still valid since the - * rw_mutex is held. - */ - return out; -} - -struct kern_ipc_perm *ipc_lock_check_down(struct ipc_ids *ids, int id) -{ - struct kern_ipc_perm *out; - - out = ipc_lock_down(ids, id); - if (IS_ERR(out)) - return out; - - if (ipc_checkid(out, id)) { - ipc_unlock(out); - return ERR_PTR(-EIDRM); - } - - return out; -} - struct kern_ipc_perm *ipc_lock_check(struct ipc_ids *ids, int id) { struct kern_ipc_perm *out; @@ -837,7 +787,7 @@ struct kern_ipc_perm *ipcctl_pre_down(struct ipc_ids *ids, int id, int cmd, int err; down_write(&ids->rw_mutex); - ipcp = ipc_lock_check_down(ids, id); + ipcp = ipc_lock_check(ids, id); if (IS_ERR(ipcp)) { err = PTR_ERR(ipcp); goto out_up; -- cgit v1.2.3-59-g8ed1b