From 7aa484815f8c4defd01366f239b71da5e6b8a791 Mon Sep 17 00:00:00 2001 From: Stefan Richter Date: Mon, 2 Jul 2007 21:04:44 +0200 Subject: [PATCH] firewire: fw-sbp2: fix DMA mapping of management ORBs MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The CPU must not touch the buffer after it was DMA-mapped. Signed-off-by: Stefan Richter Signed-off-by: Kristian Høgsberg --- drivers/firewire/fw-sbp2.c | 21 +++++++++------------ 1 file changed, 9 insertions(+), 12 deletions(-) diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c index f488ff8903fc..7c53be0387fb 100644 --- a/drivers/firewire/fw-sbp2.c +++ b/drivers/firewire/fw-sbp2.c @@ -416,21 +416,11 @@ sbp2_send_management_orb(struct fw_unit *unit, int node_id, int generation, if (orb == NULL) return -ENOMEM; - /* - * The sbp2 device is going to send a block read request to - * read out the request from host memory, so map it for dma. - */ - orb->base.request_bus = - dma_map_single(device->card->device, &orb->request, - sizeof(orb->request), DMA_TO_DEVICE); - if (dma_mapping_error(orb->base.request_bus)) - goto out; - orb->response_bus = dma_map_single(device->card->device, &orb->response, sizeof(orb->response), DMA_FROM_DEVICE); if (dma_mapping_error(orb->response_bus)) - goto out; + goto fail_mapping_response; orb->request.response.high = 0; orb->request.response.low = orb->response_bus; @@ -456,6 +446,12 @@ sbp2_send_management_orb(struct fw_unit *unit, int node_id, int generation, init_completion(&orb->done); orb->base.callback = complete_management_orb; + orb->base.request_bus = + dma_map_single(device->card->device, &orb->request, + sizeof(orb->request), DMA_TO_DEVICE); + if (dma_mapping_error(orb->base.request_bus)) + goto fail_mapping_request; + sbp2_send_orb(&orb->base, unit, node_id, generation, sd->management_agent_address); @@ -487,9 +483,10 @@ sbp2_send_management_orb(struct fw_unit *unit, int node_id, int generation, out: dma_unmap_single(device->card->device, orb->base.request_bus, sizeof(orb->request), DMA_TO_DEVICE); + fail_mapping_request: dma_unmap_single(device->card->device, orb->response_bus, sizeof(orb->response), DMA_FROM_DEVICE); - + fail_mapping_response: if (response) fw_memcpy_from_be32(response, orb->response, sizeof(orb->response)); -- 2.20.1