From 45c463ae924c62af4aa64ded1ca831f334a1db65 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Fri, 18 Oct 2013 19:35:24 +0200 Subject: dmaengine: reference counted unmap data Hang a common 'unmap' object off of dma descriptors for the purpose of providing a unified unmapping interface. The lifetime of a mapping may span multiple descriptors, so these unmap objects are reference counted by related descriptor. Cc: Vinod Koul Cc: Tomasz Figa Cc: Dave Jiang [bzolnier: fix IS_ENABLED() check] [bzolnier: fix release ordering in dmaengine_destroy_unmap_pool()] [bzolnier: fix check for success in dmaengine_init_unmap_pool()] [bzolnier: use mempool_free() instead of kmem_cache_free()] [bzolnier: add missing unmap->len initializations] [bzolnier: add __init tag to dmaengine_init_unmap_pool()] Signed-off-by: Bartlomiej Zolnierkiewicz Signed-off-by: Kyungmin Park [djbw: move DMAENGINE=n support to this patch for async_tx] Signed-off-by: Dan Williams --- include/linux/dmaengine.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/linux') diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 9070050fbcd8..2fe855a7cab1 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -464,9 +464,12 @@ static inline void dma_set_unmap(struct dma_async_tx_descriptor *tx, tx->unmap = unmap; } +void dmaengine_unmap_put(struct dmaengine_unmap_data *unmap); + static inline void dma_descriptor_unmap(struct dma_async_tx_descriptor *tx) { if (tx->unmap) { + dmaengine_unmap_put(tx->unmap); tx->unmap = NULL; } } -- cgit v1.2.1