From e4f50f003dc568f6fc3904d451c562007bd09640 Mon Sep 17 00:00:00 2001 From: Roland Dreier Date: Wed, 25 May 2005 12:31:29 -0700 Subject: [PATCH] IB: allow NULL sa_query callbacks Check if a client passes a NULL callback into an SA query, and if so, never call back. This fixes an oops if someone unloads ib_ipoib and ib_sa in rapid succession. ib_ipoib does an MCMember delete with a NULL callback and 0 timeout on unload, which is usually fine since the delete completes successfully. However, if ib_sa is unloaded immediately afterwards, the delete will be canceled and ib_sa will try to call the (now already unloaded) ib_ipoib module back with the cancel completion, which triggers the oops. Signed-off-by: Roland Dreier Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/infiniband/core/sa_query.c | 35 ++++++++++++++++++----------------- 1 file changed, 18 insertions(+), 17 deletions(-) diff --git a/drivers/infiniband/core/sa_query.c b/drivers/infiniband/core/sa_query.c index d4233ee..276e1a5 100644 --- a/drivers/infiniband/core/sa_query.c +++ b/drivers/infiniband/core/sa_query.c @@ -587,7 +587,7 @@ int ib_sa_path_rec_get(struct ib_device *device, u8 port_num, init_mad(query->sa_query.mad, agent); - query->sa_query.callback = ib_sa_path_rec_callback; + query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL; query->sa_query.release = ib_sa_path_rec_release; query->sa_query.port = port; query->sa_query.mad->mad_hdr.method = IB_MGMT_METHOD_GET; @@ -663,7 +663,7 @@ int ib_sa_mcmember_rec_query(struct ib_device *device, u8 port_num, init_mad(query->sa_query.mad, agent); - query->sa_query.callback = ib_sa_mcmember_rec_callback; + query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL; query->sa_query.release = ib_sa_mcmember_rec_release; query->sa_query.port = port; query->sa_query.mad->mad_hdr.method = method; @@ -698,20 +698,21 @@ static void send_handler(struct ib_mad_agent *agent, if (!query) return; - switch (mad_send_wc->status) { - case IB_WC_SUCCESS: - /* No callback -- already got recv */ - break; - case IB_WC_RESP_TIMEOUT_ERR: - query->callback(query, -ETIMEDOUT, NULL); - break; - case IB_WC_WR_FLUSH_ERR: - query->callback(query, -EINTR, NULL); - break; - default: - query->callback(query, -EIO, NULL); - break; - } + if (query->callback) + switch (mad_send_wc->status) { + case IB_WC_SUCCESS: + /* No callback -- already got recv */ + break; + case IB_WC_RESP_TIMEOUT_ERR: + query->callback(query, -ETIMEDOUT, NULL); + break; + case IB_WC_WR_FLUSH_ERR: + query->callback(query, -EINTR, NULL); + break; + default: + query->callback(query, -EIO, NULL); + break; + } dma_unmap_single(agent->device->dma_device, pci_unmap_addr(query, mapping), @@ -736,7 +737,7 @@ static void recv_handler(struct ib_mad_agent *mad_agent, query = idr_find(&query_idr, mad_recv_wc->wc->wr_id); spin_unlock_irqrestore(&idr_lock, flags); - if (query) { + if (query && query->callback) { if (mad_recv_wc->wc->status == IB_WC_SUCCESS) query->callback(query, mad_recv_wc->recv_buf.mad->mad_hdr.status ? -- cgit v1.1