staging: comedi: mite: introduce mite_free_dma_descs() (9ec148da) · Commits · 戴 / test

drivers/staging/comedi/drivers/mite.c

+16 −17

Original line number	Diff line number	Diff line
		@@ -371,16 +371,24 @@ struct mite_ring mite_alloc_ring(struct mite mite)
		};
		EXPORT_SYMBOL_GPL(mite_alloc_ring);

		void mite_free_ring(struct mite_ring *ring)
		static void mite_free_dma_descs(struct mite_ring *ring)
		{
		if (ring) {
		if (ring->descs) {
		struct mite_dma_desc *descs = ring->descs;

		if (descs) {
		dma_free_coherent(ring->hw_dev,
		ring->n_links *
		sizeof(struct mite_dma_desc),
		ring->descs,
		ring->dma_addr);
		ring->n_links * sizeof(*descs),
		descs, ring->dma_addr);
		ring->descs = NULL;
		ring->dma_addr = 0;
		ring->n_links = 0;
		}
		}

		void mite_free_ring(struct mite_ring *ring)
		{
		if (ring) {
		mite_free_dma_descs(ring);
		put_device(ring->hw_dev);
		kfree(ring);
		}
		@@ -467,16 +475,7 @@ int mite_buf_change(struct mite_ring *ring,
		struct comedi_async *async = s->async;
		unsigned int n_links;

		if (ring->descs) {
		dma_free_coherent(ring->hw_dev,
		ring->n_links *
		sizeof(struct mite_dma_desc),
		ring->descs,
		ring->dma_addr);
		}
		ring->descs = NULL;
		ring->dma_addr = 0;
		ring->n_links = 0;
		mite_free_dma_descs(ring);

		if (async->prealloc_bufsz == 0)
		return 0;