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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
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