netdev - [PATCH] i40e: add a fault tolerance judgment

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Date:   Thu, 20 Oct 2022 11:34:25 +0800
From:   xiaolinkui <xiaolinkui@....com>
To:     jesse.brandeburg@...el.com, anthony.l.nguyen@...el.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, xiaolinkui@....com
Cc:     intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        Linkui Xiao <xiaolinkui@...inos.cn>
Subject: [PATCH] i40e: add a fault tolerance judgment

From: Linkui Xiao <xiaolinkui@...inos.cn>

Avoid requesting memory when system memory resources are insufficient.
Reference function i40e_setup_tx_descriptors, adding fault tolerance
handling.

Signed-off-by: Linkui Xiao <xiaolinkui@...inos.cn>
---
 drivers/net/ethernet/intel/i40e/i40e_txrx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index d4226161a3ef..673f2f0d078f 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -1565,6 +1565,9 @@ int i40e_setup_rx_descriptors(struct i40e_ring *rx_ring)
 	struct device *dev = rx_ring->dev;
 	int err;
 
+	if (!dev)
+		return -ENOMEM;
+
 	u64_stats_init(&rx_ring->syncp);
 
 	/* Round up to nearest 4K */
-- 
2.17.1