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From:   Guangbin Huang <huangguangbin2@huawei.com>
To:     <davem@davemloft.net>, <kuba@kernel.org>
CC:     <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <lipeng321@huawei.com>, <huangguangbin2@huawei.com>,
        <chenhao288@hisilicon.com>
Subject: [PATCH net 2/6] net: hns3: add max order judgement for tx spare buffer
Date:   Sat, 26 Mar 2022 17:51:01 +0800
Message-ID: <20220326095105.54075-3-huangguangbin2@huawei.com>
In-Reply-To: <20220326095105.54075-1-huangguangbin2@huawei.com>
References: <20220326095105.54075-1-huangguangbin2@huawei.com>
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From: Hao Chen <chenhao288@hisilicon.com>

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>
---
 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 16137238ddbf..530ba8bef503 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) {
-- 
2.33.0