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[net-next] xdp: xdp_umem: fix umem pages mapping for 32bits systems

Message ID 20190626155911.13574-1-ivan.khoronzhuk@linaro.org
State New
Headers show
Series [net-next] xdp: xdp_umem: fix umem pages mapping for 32bits systems | expand

Commit Message

Ivan Khoronzhuk June 26, 2019, 3:59 p.m. UTC 
Use kmap instead of page_address as it's not always in low memory.

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>

---
 net/xdp/xdp_umem.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

-- 
2.17.1
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Patch

diff --git a/net/xdp/xdp_umem.c b/net/xdp/xdp_umem.c
index 9c6de4f114f8..d3c1411420fd 100644
--- a/net/xdp/xdp_umem.c
+++ b/net/xdp/xdp_umem.c
@@ -169,6 +169,14 @@  static void xdp_umem_clear_dev(struct xdp_umem *umem)
 	}
 }
 
+static void xdp_umem_unmap_pages(struct xdp_umem *umem)
+{
+	unsigned int i;
+
+	for (i = 0; i < umem->npgs; i++)
+		kunmap(umem->pgs[i]);
+}
+
 static void xdp_umem_unpin_pages(struct xdp_umem *umem)
 {
 	unsigned int i;
@@ -210,6 +218,7 @@  static void xdp_umem_release(struct xdp_umem *umem)
 
 	xsk_reuseq_destroy(umem);
 
+	xdp_umem_unmap_pages(umem);
 	xdp_umem_unpin_pages(umem);
 
 	kfree(umem->pages);
@@ -372,7 +381,7 @@  static int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr)
 	}
 
 	for (i = 0; i < umem->npgs; i++)
-		umem->pages[i].addr = page_address(umem->pgs[i]);
+		umem->pages[i].addr = kmap(umem->pgs[i]);
 
 	return 0;