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| author | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2007-07-02 22:07:34 +0200 |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2007-07-10 00:07:48 +0200 |
| commit | b4be016ad81af5a83f0be820edf106de883e6ade (patch) | |
| tree | f15e6577aee7b098ba52bb3f8dfeaa2af61c3716 | |
| parent | 332ef3310bc37ff29fd4382d6dfb38a787078091 (diff) | |
| download | linux-b4be016ad81af5a83f0be820edf106de883e6ade.tar.gz linux-b4be016ad81af5a83f0be820edf106de883e6ade.tar.bz2 linux-b4be016ad81af5a83f0be820edf106de883e6ade.zip | |
firewire: fw-sbp2: fix DMA mapping of S/G tables
- The CPU must not touch the buffer after it was DMA-mapped.
- The size argument of dma_unmap_single(...page_table...) was bogus.
- Move a comment closer to the code to which it refers to.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
| -rw-r--r-- | drivers/firewire/fw-sbp2.c | 19 |
1 files changed, 8 insertions, 11 deletions
diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c index c7518ea4c8ee..a2ddf318a250 100644 --- a/drivers/firewire/fw-sbp2.c +++ b/drivers/firewire/fw-sbp2.c @@ -887,7 +887,7 @@ complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status) if (orb->page_table_bus != 0) dma_unmap_single(device->card->device, orb->page_table_bus, - sizeof(orb->page_table_bus), DMA_TO_DEVICE); + sizeof(orb->page_table), DMA_TO_DEVICE); orb->cmd->result = result; orb->done(orb->cmd); @@ -902,7 +902,6 @@ static int sbp2_command_orb_map_scatterlist(struct sbp2_command_orb *orb) struct fw_device *device = fw_device(unit->device.parent); struct scatterlist *sg; int sg_len, l, i, j, count; - size_t size; dma_addr_t sg_addr; sg = (struct scatterlist *)orb->cmd->request_buffer; @@ -951,7 +950,13 @@ static int sbp2_command_orb_map_scatterlist(struct sbp2_command_orb *orb) } } - size = sizeof(orb->page_table[0]) * j; + fw_memcpy_to_be32(orb->page_table, orb->page_table, + sizeof(orb->page_table[0]) * j); + orb->page_table_bus = + dma_map_single(device->card->device, orb->page_table, + sizeof(orb->page_table), DMA_TO_DEVICE); + if (dma_mapping_error(orb->page_table_bus)) + goto fail_page_table; /* * The data_descriptor pointer is the one case where we need @@ -960,20 +965,12 @@ static int sbp2_command_orb_map_scatterlist(struct sbp2_command_orb *orb) * initiator (i.e. us), but data_descriptor can refer to data * on other nodes so we need to put our ID in descriptor.high. */ - - orb->page_table_bus = - dma_map_single(device->card->device, orb->page_table, - size, DMA_TO_DEVICE); - if (dma_mapping_error(orb->page_table_bus)) - goto fail_page_table; orb->request.data_descriptor.high = sd->address_high; orb->request.data_descriptor.low = orb->page_table_bus; orb->request.misc |= COMMAND_ORB_PAGE_TABLE_PRESENT | COMMAND_ORB_DATA_SIZE(j); - fw_memcpy_to_be32(orb->page_table, orb->page_table, size); - return 0; fail_page_table: |