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authorStefan Richter <stefanr@s5r6.in-berlin.de>2007-07-02 21:04:44 +0200
committerStefan Richter <stefanr@s5r6.in-berlin.de>2007-07-10 00:07:49 +0200
commit7aa484815f8c4defd01366f239b71da5e6b8a791 (patch)
tree63bf30875b700b603fdbaa317a523cbfe6d57496 /drivers/firewire
parent8526392ae816a2c69f57097ba032865523019caa (diff)
firewire: fw-sbp2: fix DMA mapping of management ORBs
The CPU must not touch the buffer after it was DMA-mapped. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Diffstat (limited to 'drivers/firewire')
-rw-r--r--drivers/firewire/fw-sbp2.c21
1 files 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));