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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
parent 0c53decdd0
commit 6fdc037094
5 changed files with 26 additions and 20 deletions
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4
drivers/firewire/core-cdev.c
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@ -125,6 +125,7 @@ struct iso_resource {
int generation;
u64 channels;
s32 bandwidth;
__be32 transaction_data[2];
struct iso_resource_event *e_alloc, *e_dealloc;
};
@ -1049,7 +1050,8 @@ static void iso_resource_work(struct work_struct *work)
r->channels, &channel, &bandwidth,
todo == ISO_RES_ALLOC ||
todo == ISO_RES_REALLOC ||
todo == ISO_RES_ALLOC_ONCE);
todo == ISO_RES_ALLOC_ONCE,
r->transaction_data);
/*
* Is this generation outdated already? As long as this resource sticks
* in the idr, it will be scheduled again for a newer generation or at