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-rw-r--r--fs/cifs/transport.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 2126ab185045..76d974c952fe 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -183,6 +183,12 @@ smb_send_kvec(struct TCP_Server_Info *server, struct kvec *iov, size_t n_vec,
 		rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec],
 				    n_vec - first_vec, remaining);
 		if (rc == -ENOSPC || rc == -EAGAIN) {
+			/*
+			 * Catch if a low level driver returns -ENOSPC. This
+			 * WARN_ON will be removed by 3.10 if no one reports
+			 * seeing this.
+			 */
+			WARN_ON_ONCE(rc == -ENOSPC);
 			i++;
 			if (i >= 14 || (!server->noblocksnd && (i > 2))) {
 				cERROR(1, "sends on sock %p stuck for 15 "