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authorStefan Richter <stefanr@s5r6.in-berlin.de>2011-04-22 15:13:54 +0200
committerStefan Richter <stefanr@s5r6.in-berlin.de>2011-05-10 22:53:44 +0200
commitf30e6d3e419bfb5540fa82ba7eca01d578556e6b (patch)
treee4d6e7bad161a76b09557bf7513358ae1ce8f7fb /drivers/firewire/core-cdev.c
parent020abf03cd659388f94cb328e1e1df0656e0d7ff (diff)
firewire: octlet AT payloads can be stack-allocated
We do not need slab allocations anymore in order to satisfy streaming DMA mapping constraints, thanks to commit da28947e7e36 "firewire: ohci: avoid separate DMA mapping for small AT payloads". (Besides, the slab-allocated buffers that firewire-core, firewire-sbp2, and firedtv used to provide for 8-byte write and lock requests were still not fully portable since they crossed cacheline boundaries or shared a cacheline with unrelated CPU-accessed data. snd-firewire-lib got this aspect right by using an extra kmalloc/ kfree just for the 8-byte transaction buffer.) This change replaces kmalloc'ed lock transaction scratch buffers in firewire-core, firedtv, and snd-firewire-lib by local stack allocations. Perhaps the most notable result of the change is simpler locking because there is no need to serialize usages of preallocated per-device buffers anymore. Also, allocations and deallocations are simpler. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Acked-by: Clemens Ladisch <clemens@ladisch.de>
Diffstat (limited to 'drivers/firewire/core-cdev.c')
-rw-r--r--drivers/firewire/core-cdev.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c
index 62ac111af243..2a3f1c4d6906 100644
--- a/drivers/firewire/core-cdev.c
+++ b/drivers/firewire/core-cdev.c
@@ -141,7 +141,6 @@ struct iso_resource {
int generation;
u64 channels;
s32 bandwidth;
- __be32 transaction_data[2];
struct iso_resource_event *e_alloc, *e_dealloc;
};
@@ -1229,8 +1228,7 @@ 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,
- r->transaction_data);
+ todo == ISO_RES_ALLOC_ONCE);
/*
* Is this generation outdated already?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

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