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authorJeff Layton <jlayton@redhat.com>2008-08-02 08:00:48 -0400
committerSteve French <sfrench@us.ibm.com>2008-08-04 02:02:15 +0000
commit93d0ec851820688ef5b21a84e7460d3cf405f5c5 (patch)
tree280b8e8ba981f77422e63c9223137e3a24ab98f0 /fs/cifs
parent66b8bd3c405389213de1d6ba6c2565990f62004f (diff)
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 <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/connect.c15
1 files changed, 6 insertions, 9 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index b51d5777cde..34a1fc9dabf 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);