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firewire: core: do not DMA-map stack addresses

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The DMA mapping API cannot map on-stack addresses, as explained in
Documentation/DMA-mapping.txt.  Convert the two cases of on-stack packet
payload buffers in firewire-core (payload of lock requests in the bus
manager work and in iso resource management) to slab-allocated memory.

There are a number on-stack buffers for quadlet write or quadlet read
requests in firewire-core and firewire-sbp2.  These are harmless; they
are copied to/ from card driver internal DMA buffers since quadlet
payloads are inlined with packet headers.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Stefan Richter 2009-06-20 13:23:59 +02:00
commit 6fdc037094
5 changed files with 26 additions and 20 deletions
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1
include/linux/firewire.h
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@ -127,6 +127,7 @@ struct fw_card {
struct delayed_work work;
int bm_retries;
int bm_generation;
__be32 bm_transaction_data[2];
bool broadcast_channel_allocated;
u32 broadcast_channel;