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NFS: get module in idmap PipeFS notifier callback

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This is bug fix.
Notifier callback is called from SUNRPC module. So before dereferencing NFS
module we have to make sure, that it's alive.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Stanislav Kinsbursky 2012-04-28 19:32:21 +04:00 committed by Trond Myklebust
parent e245d4250d
commit 71dfc5fa51
1 changed files with 4 additions and 0 deletions
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4
fs/nfs/idmap.c
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@ -554,12 +554,16 @@ static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
struct nfs_client *clp;
int error = 0;
if (!try_module_get(THIS_MODULE))
return 0;
while ((clp = nfs_get_client_for_event(sb->s_fs_info, event))) {
error = __rpc_pipefs_event(clp, event, sb);
nfs_put_client(clp);
if (error)
break;
}
module_put(THIS_MODULE);
return error;
}