5.4-stable review patch. If anyone has any objections, please let me know.
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From: Stefan Metzmacher metze@samba.org
[ Upstream commit bdd7afc6dca5e0ebbb75583484aa6ea9e03fbb13 ]
We should call put_receive_buffer() before waking up the callers.
For the internal error case of response->type being unexpected, we now also call smbd_disconnect_rdma_connection() instead of not waking up the callers at all.
Note that the SMBD_TRANSFER_DATA case still has problems, which will be addressed in the next commit in order to make it easier to review this one.
Cc: Steve French smfrench@gmail.com Cc: Tom Talpey tom@talpey.com Cc: Long Li longli@microsoft.com Cc: linux-cifs@vger.kernel.org Cc: samba-technical@lists.samba.org Fixes: f198186aa9bb ("CIFS: SMBD: Establish SMB Direct connection") Signed-off-by: Stefan Metzmacher metze@samba.org Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/cifs/smbdirect.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c index 0842a1af0b98..72df002e8ae3 100644 --- a/fs/cifs/smbdirect.c +++ b/fs/cifs/smbdirect.c @@ -495,7 +495,6 @@ static void recv_done(struct ib_cq *cq, struct ib_wc *wc) if (wc->status != IB_WC_SUCCESS || wc->opcode != IB_WC_RECV) { log_rdma_recv(INFO, "wc->status=%d opcode=%d\n", wc->status, wc->opcode); - smbd_disconnect_rdma_connection(info); goto error; }
@@ -512,8 +511,9 @@ static void recv_done(struct ib_cq *cq, struct ib_wc *wc) info->full_packet_received = true; info->negotiate_done = process_negotiation_response(response, wc->byte_len); + put_receive_buffer(info, response); complete(&info->negotiate_completion); - break; + return;
/* SMBD data transfer packet */ case SMBD_TRANSFER_DATA: @@ -565,14 +565,16 @@ static void recv_done(struct ib_cq *cq, struct ib_wc *wc)
queue_work(info->workqueue, &info->recv_done_work); return; - - default: - log_rdma_recv(ERR, - "unexpected response type=%d\n", response->type); }
+ /* + * This is an internal error! + */ + log_rdma_recv(ERR, "unexpected response type=%d\n", response->type); + WARN_ON_ONCE(response->type != SMBD_TRANSFER_DATA); error: put_receive_buffer(info, response); + smbd_disconnect_rdma_connection(info); }
static struct rdma_cm_id *smbd_create_id(