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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>
hifive-unleashed-5.1
Jeff Layton 2008-08-02 08:00:48 -04:00 committed by Steve French
parent 66b8bd3c40
commit 93d0ec8518
1 changed files with 6 additions and 9 deletions
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15
fs/cifs/connect.c
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@ -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);