From 93d0ec851820688ef5b21a84e7460d3cf405f5c5 Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Sat, 2 Aug 2008 08:00:48 -0400 Subject: [PATCH] remove locking around tcpSesAllocCount atomic variable The global tcpSesAllocCount variable is an atomic already and doesn't really need the extra locking around it. Remove the locking and just use the atomic_inc_return and atomic_dec_return functions to make sure we access it correctly. Signed-off-by: Jeff Layton Signed-off-by: Steve French --- fs/cifs/connect.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index b51d5777cde6..34a1fc9dabf5 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -351,11 +351,9 @@ cifs_demultiplex_thread(struct TCP_Server_Info *server) current->flags |= PF_MEMALLOC; cFYI(1, ("Demultiplex PID: %d", task_pid_nr(current))); - write_lock(&GlobalSMBSeslock); - atomic_inc(&tcpSesAllocCount); - length = tcpSesAllocCount.counter; - write_unlock(&GlobalSMBSeslock); - if (length > 1) + + length = atomic_inc_return(&tcpSesAllocCount); + if (length > 1) mempool_resize(cifs_req_poolp, length + cifs_min_rcv, GFP_KERNEL); @@ -745,14 +743,11 @@ multi_t2_fnd: coming home not much else we can do but free the memory */ } - write_lock(&GlobalSMBSeslock); - atomic_dec(&tcpSesAllocCount); - length = tcpSesAllocCount.counter; - /* last chance to mark ses pointers invalid if there are any pointing to this (e.g if a crazy root user tried to kill cifsd kernel thread explicitly this might happen) */ + write_lock(&GlobalSMBSeslock); list_for_each(tmp, &GlobalSMBSessionList) { ses = list_entry(tmp, struct cifsSesInfo, cifsSessionList); @@ -763,6 +758,8 @@ multi_t2_fnd: kfree(server->hostname); kfree(server); + + length = atomic_dec_return(&tcpSesAllocCount); if (length > 0) mempool_resize(cifs_req_poolp, length + cifs_min_rcv, GFP_KERNEL); -- 2.34.1