[PATCH] r8169: avoid OOM when allocating RX buffers

[Fabian Druschke <fabian@druschke.network>]

From: Fabian Druschke <fdruschke@outlook.com>

r8169 allocates order-2 pages for RX buffers during rtl_open(). Under heavy
memory fragmentation this allocation may trigger the global OOM killer,
causing unrelated user processes to be killed.

Use a GFP mask that avoids OOM killer invocation so the allocation can fail
gracefully and rtl_open() returns -ENOMEM instead.

Cc: stable@vger.kernel.org
Signed-off-by: Fabian Druschke <fdruschke@outlook.com>
---
 drivers/net/ethernet/realtek/r8169_main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 3507c2e28110..3525e889ec1c 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -3952,7 +3952,8 @@ static struct page *rtl8169_alloc_rx_data(struct rtl8169_private *tp,
 	dma_addr_t mapping;
 	struct page *data;
 
-	data = alloc_pages_node(node, GFP_KERNEL, get_order(R8169_RX_BUF_SIZE));
+	gfp_t gfp = GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN;
+	data = alloc_pages_node(node, gfp, get_order(R8169_RX_BUF_SIZE));
 	if (!data)
 		return NULL;
 
-- 
2.52.0