[PATCH 1/1] NFSv4.2 do not allocate memory under the lock

[Olga Kornievskaia <olga.kornievskaia@xxxxxxxxx>]

From: Olga Kornievskaia <kolga@xxxxxxxxxx>

Bruce pointed out that we shouldn't allocate memory while holding
a lock.

Signed-off-by: Olga Kornievskaia <kolga@xxxxxxxxxx>
---
 fs/nfs/callback_proc.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c
index fa515d5..f67665a 100644
--- a/fs/nfs/callback_proc.c
+++ b/fs/nfs/callback_proc.c
@@ -689,6 +689,10 @@ __be32 nfs4_callback_offload(void *data, void *dummy,
 	struct nfs4_copy_state *copy;
 	bool found = false;
 
+	copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS);
+	if (!copy)
+		return htonl(NFS4ERR_SERVERFAULT);
+
 	spin_lock(&cps->clp->cl_lock);
 	rcu_read_lock();
 	list_for_each_entry_rcu(server, &cps->clp->cl_superblocks,
@@ -707,15 +711,11 @@ __be32 nfs4_callback_offload(void *data, void *dummy,
 out:
 	rcu_read_unlock();
 	if (!found) {
-		copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS);
-		if (!copy) {
-			spin_unlock(&cps->clp->cl_lock);
-			return htonl(NFS4ERR_SERVERFAULT);
-		}
 		memcpy(&copy->stateid, &args->coa_stateid, NFS4_STATEID_SIZE);
 		nfs4_copy_cb_args(copy, args);
 		list_add_tail(&copy->copies, &cps->clp->pending_cb_stateids);
-	}
+	} else
+		kfree(copy);
 	spin_unlock(&cps->clp->cl_lock);
 
 	return 0;
-- 
1.8.3.1