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authorDenis Kirjanov <kda@linux-powerpc.org>2020-03-25 23:35:28 +0300
committerDavid S. Miller <davem@davemloft.net>2020-03-29 21:49:20 -0700
commit798dda818ad1fdad6240959241194b490d6660ee (patch)
tree143229522200156744ffef94c621a3b9b733d2b3 /net/core/page_pool.c
parent5ef5c90e3cb3ae1ce7bebddaeb8e8f44309950f7 (diff)
downloadlinux-798dda818ad1fdad6240959241194b490d6660ee.tar.bz2
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>
Diffstat (limited to 'net/core/page_pool.c')
-rw-r--r--net/core/page_pool.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 626db912fce4..ef98372facf6 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -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