Commit 798dda81 authored Mar 25, 2020 by Denis Kirjanov Committed by David S. Miller Mar 29, 2020

net: page pool: allow to pass zero flags to page_pool_init()



page pool API can be useful for non-DMA cases like
xen-netfront driver so let's allow to pass zero flags to
page pool flags.

v2: check DMA direction only if PP_FLAG_DMA_MAP is set

Signed-off-by: Denis Kirjanov <kda@linux-powerpc.org>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 5ef5c90e

net/core/page_pool.c

+5 −3

Original line number	Diff line number	Diff line
		@@ -43,9 +43,11 @@ static int page_pool_init(struct page_pool *pool,
		* DMA_BIDIRECTIONAL is for allowing page used for DMA sending,
		* which is the XDP_TX use-case.
		*/
		if (pool->p.flags & PP_FLAG_DMA_MAP) {
		if ((pool->p.dma_dir != DMA_FROM_DEVICE) &&
		(pool->p.dma_dir != DMA_BIDIRECTIONAL))
		return -EINVAL;
		}

		if (pool->p.flags & PP_FLAG_DMA_SYNC_DEV) {
		/* In order to request DMA-sync-for-device the page

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