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authorDan Williams <dan.j.williams@intel.com>2013-10-18 19:35:24 +0200
committerDan Williams <dan.j.williams@intel.com>2013-11-13 16:25:06 -0800
commit45c463ae924c62af4aa64ded1ca831f334a1db65 (patch)
tree1087e0630ec29998f15a7fc2a7dbec2a3ff35e80 /include/linux/dmaengine.h
parentd38a8c622a1b382336c3e152c6caf4e11d1f1b2a (diff)
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 <vinod.koul@intel.com> Cc: Tomasz Figa <t.figa@samsung.com> Cc: Dave Jiang <dave.jiang@intel.com> [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 <b.zolnierkie@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> [djbw: move DMAENGINE=n support to this patch for async_tx] Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'include/linux/dmaengine.h')
-rw-r--r--include/linux/dmaengine.h3
1 files changed, 3 insertions, 0 deletions
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;
}
}