linux-kernel - [PATCH net] net: bcmasp: Handle RX buffer allocation failure

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Message-Id: <20240213173339.3438713-1-florian.fainelli@broadcom.com>
Date: Tue, 13 Feb 2024 09:33:39 -0800
From: Florian Fainelli <florian.fainelli@...adcom.com>
To: netdev@...r.kernel.org
Cc: Florian Fainelli <florian.fainelli@...adcom.com>,
	Justin Chen <justin.chen@...adcom.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	bcm-kernel-feedback-list@...adcom.com (open list:BROADCOM ASP 2.0 ETHERNET DRIVER),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH net] net: bcmasp: Handle RX buffer allocation failure

The buffer_pg variable needs to hold an order-5 allocation (32 x
PAGE_SIZE) which, under memory pressure may fail to be allocated. Deal
with that error condition properly to avoid doing a NULL pointer
de-reference in the subsequent call to dma_map_page().

In addition, the err_reclaim_tx error label in bcmasp_netif_init() needs
to ensure that the TX NAPI object is properly deleted, otherwise
unregister_netdev() will spin forever attempting to test and clear
the NAPI_STATE_HASHED bit.

Fixes: 490cb412007d ("net: bcmasp: Add support for ASP2.0 Ethernet controller")
Signed-off-by: Florian Fainelli <florian.fainelli@...adcom.com>
---
 drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c b/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
index 53e542881255..f59557b0cd51 100644
--- a/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
+++ b/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
@@ -684,6 +684,8 @@ static int bcmasp_init_rx(struct bcmasp_intf *intf)
 
 	intf->rx_buf_order = get_order(RING_BUFFER_SIZE);
 	buffer_pg = alloc_pages(GFP_KERNEL, intf->rx_buf_order);
+	if (!buffer_pg)
+		return -ENOMEM;
 
 	dma = dma_map_page(kdev, buffer_pg, 0, RING_BUFFER_SIZE,
 			   DMA_FROM_DEVICE);
@@ -1092,6 +1094,7 @@ static int bcmasp_netif_init(struct net_device *dev, bool phy_connect)
 	return 0;
 
 err_reclaim_tx:
+	netif_napi_del(&intf->tx_napi);
 	bcmasp_reclaim_free_all_tx(intf);
 err_phy_disconnect:
 	if (phydev)
-- 
2.34.1