[PATCH 5.17 0816/1126] net: hns3: add max order judgement for tx spare buffer

Greg Kroah-Hartman
2022-04-05T08:35:51Z

From: Hao Chen <chenhao288@hisilicon.com>

[ Upstream commit a89cbb16995bf15582e0d1bdb922ad1a54a2fa8c ]

Add max order judgement for tx spare buffer to avoid triggering
call trace, print related fail information instead, when user
set tx spare buf size to a large value which causes order
exceeding 10.

Fixes: e445f08af2b1 ("net: hns3: add support to set/get tx copybreak buf size via ethtool for hns3 driver")
Signed-off-by: Hao Chen <chenhao288@hisilicon.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/hisilicon/hns3/hns3_enet.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index 49943775713f..214d88cd8dbb 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -1038,6 +1038,12 @@ static void hns3_init_tx_spare_buffer(struct hns3_enet_ring *ring)
return;

order = get_order(alloc_size);
+ if (order >= MAX_ORDER) {
+ if (net_ratelimit())
+ dev_warn(ring_to_dev(ring), "failed to allocate tx spare buffer, exceed to max order\n");
+ return;
+ }
+
tx_spare = devm_kzalloc(ring_to_dev(ring), sizeof(*tx_spare),
GFP_KERNEL);
if (!tx_spare) {
--
2.34.1