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>

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index 8596c318114b9c08f08a2199b3f543b1516db31a..554e2942667cfe4deb3c0bf46571130ca8cd065b 100644 (file)
--- 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)