| [PATCH v2 12/12] NFS: get module in idmap PipeFS notifier callback [message #46434 is a reply to message #46423] |
Tue, 22 May 2012 07:37  |
Stanislav Kinsbursky
Messages: 683
Registered: October 2011
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Senior Member |
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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>
---
fs/nfs/idmap.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c
index c9c3e1b..f55b80a 100644
--- a/fs/nfs/idmap.c
+++ b/fs/nfs/idmap.c
@@ -557,12 +557,16 @@ 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;
}
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