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nfsd: fix panic in posix_unblock_lock called from nfs4_laundromat 

From kernel 4.9, my two nfsv4 servers sometimes suffer from
    "panic: unable to handle kernel page request"
in posix_unblock_lock() called from nfs4_laundromat().

These panics diseappear if we revert the commit "nfsd: add a LRU list
for blocked locks".

The cause appears to be a typo in nfs4_laundromat(), which is also
present in nfs4_state_shutdown_net().

Cc: stable@vger.kernel.org
Fixes: 7919d0a27f "nfsd: add a LRU list for blocked locks"
Cc: jlayton@redhat.com
Reveiwed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Naofumi Honda 2017-11-09 10:57:16 -05:00 committed by J. Bruce Fields
parent 3a2b19d1ee
commit 64ebe12494
1 changed files with 2 additions and 2 deletions
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4
fs/nfsd/nfs4state.c
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@ -4790,7 +4790,7 @@ nfs4_laundromat(struct nfsd_net *nn)
spin_unlock(&nn->blocked_locks_lock);
while (!list_empty(&reaplist)) {
nbl = list_first_entry(&nn->blocked_locks_lru,
nbl = list_first_entry(&reaplist,
struct nfsd4_blocked_lock, nbl_lru);
list_del_init(&nbl->nbl_lru);
posix_unblock_lock(&nbl->nbl_lock);
@ -7236,7 +7236,7 @@ nfs4_state_shutdown_net(struct net *net)
spin_unlock(&nn->blocked_locks_lock);
while (!list_empty(&reaplist)) {
nbl = list_first_entry(&nn->blocked_locks_lru,
nbl = list_first_entry(&reaplist,
struct nfsd4_blocked_lock, nbl_lru);
list_del_init(&nbl->nbl_lru);
posix_unblock_lock(&nbl->nbl_lock);