tree 6c380f5877562778335d6794e1e4a297f8970d77
parent 3e24e132878c83910b61eb7704511a6d96a0389f
author Suresh Jayaraman <sjayaraman@suse.de> 1287424777 +0530
committer Steve French <sfrench@us.ibm.com> 1287666867 +0000

cifs: convert cifs_tcp_ses_lock from a rwlock to a spinlock

cifs_tcp_ses_lock is a rwlock with protects the cifs_tcp_ses_list,
server->smb_ses_list and the ses->tcon_list. It also protects a few
ref counters in server, ses and tcon. In most cases the critical section
doesn't seem to be large, in a few cases where it is slightly large, there
seem to be really no benefit from concurrent access. I briefly considered RCU
mechanism but it appears to me that there is no real need.

Replace it with a spinlock and get rid of the last rwlock in the cifs code.

Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: Steve French <sfrench@us.ibm.com>