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

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Date: Tue, 13 Feb 2024 10:56:29 -0800
From: Justin Chen <justin.chen@...adcom.com>
To: Florian Fainelli <florian.fainelli@...adcom.com>, netdev@...r.kernel.org
Cc: "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>,
 "open list:BROADCOM ASP 2.0 ETHERNET DRIVER"
 <bcm-kernel-feedback-list@...adcom.com>,
 open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] net: bcmasp: Handle RX buffer allocation failure



On 2/13/24 9:33 AM, Florian Fainelli wrote:
> 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>

Reviewed-by: Justin Chen <justin.chen@...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)

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