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authorRabin Vincent <rabin.vincent@stericsson.com>2010-10-06 08:20:37 +0000
committerDan Williams <dan.j.williams@intel.com>2010-10-07 14:54:55 -0700
commita2c15fa4c122558472f8041515072218c8652c7e (patch)
treef4758cff216bd64a3ddff6e73d40cf2ffc8068c9 /drivers/dma
parentc6134c967c5b8b5986371de335fa4ec39de268bc (diff)
DMAENGINE: ste_dma40: fix desc_get
Fix desc_get to alloc a descriptor from the cache if the ones in the list are waiting for the ack. Also, memzero the descriptor when allocated from the list to ensure all fields are cleared. Acked-by: Jonas Aaberg <jonas.aberg@stericsson.com> Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/ste_dma40.c23
1 files changed, 14 insertions, 9 deletions
diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index 8596c318114b..554e2942667c 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -419,24 +419,29 @@ static void d40_desc_remove(struct d40_desc *d40d)
static struct d40_desc *d40_desc_get(struct d40_chan *d40c)
{
- struct d40_desc *d;
- struct d40_desc *_d;
+ struct d40_desc *desc = NULL;
if (!list_empty(&d40c->client)) {
+ struct d40_desc *d;
+ struct d40_desc *_d;
+
list_for_each_entry_safe(d, _d, &d40c->client, node)
if (async_tx_test_ack(&d->txd)) {
d40_pool_lli_free(d);
d40_desc_remove(d);
+ desc = d;
+ memset(desc, 0, sizeof(*desc));
break;
}
- } else {
- d = kmem_cache_alloc(d40c->base->desc_slab, GFP_NOWAIT);
- if (d != NULL) {
- memset(d, 0, sizeof(struct d40_desc));
- INIT_LIST_HEAD(&d->node);
- }
}
- return d;
+
+ if (!desc)
+ desc = kmem_cache_zalloc(d40c->base->desc_slab, GFP_NOWAIT);
+
+ if (desc)
+ INIT_LIST_HEAD(&desc->node);
+
+ return desc;
}
static void d40_desc_free(struct d40_chan *d40c, struct d40_desc *d40d)