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nfsd: fix race in nfsd_nrthreads() 

We need the nfsd_mutex before accessing nfsd_serv->sv_nrthreads or we
can't even guarantee nfsd_serv will still be there.

Signed-off-by: Neil Brown <neilb@suse.de>
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
Neil Brown 2008-06-12 13:38:42 +10:00 committed by J. Bruce Fields
parent abd1ec4efd
commit c7d106c90e
1 changed files with 6 additions and 4 deletions
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10
fs/nfsd/nfssvc.c
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@ -165,10 +165,12 @@ int nfsd_vers(int vers, enum vers_op change)
int nfsd_nrthreads(void)
{
if (nfsd_serv == NULL)
return 0;
else
return nfsd_serv->sv_nrthreads;
int rv = 0;
mutex_lock(&nfsd_mutex);
if (nfsd_serv)
rv = nfsd_serv->sv_nrthreads;
mutex_unlock(&nfsd_mutex);
return rv;
}
static void nfsd_last_thread(struct svc_serv *serv)