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

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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>
This commit is contained in:
Denis Kirjanov 2020-03-25 23:35:28 +03:00 committed by David S. Miller
parent 5ef5c90e3c
commit 798dda818a
1 changed files with 5 additions and 3 deletions
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8
net/core/page_pool.c
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@ -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.dma_dir != DMA_FROM_DEVICE) &&
(pool->p.dma_dir != DMA_BIDIRECTIONAL))
return -EINVAL;
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