linux-kernel - Re: [PATCH net v5] net: systemport: Add error pointer checks in bcm_sysport_map_queues() and bcm_sysport_unmap

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Message-ID: <20240927110236.GK4029621@kernel.org>
Date: Fri, 27 Sep 2024 12:02:36 +0100
From: Simon Horman <horms@...nel.org>
To: Dipendra Khadka <kdipendra88@...il.com>
Cc: florian.fainelli@...adcom.com, bcm-kernel-feedback-list@...adcom.com,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, maxime.chevallier@...tlin.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: [PATCH net v5] net: systemport: Add error pointer checks in
 bcm_sysport_map_queues() and bcm_sysport_unmap_queues()

+ Vladimir

On Thu, Sep 26, 2024 at 04:05:12PM +0000, Dipendra Khadka wrote:
> Add error pointer checks in bcm_sysport_map_queues() and
> bcm_sysport_unmap_queues() after calling dsa_port_from_netdev().
> 
> Fixes: 1593cd40d785 ("net: systemport: use standard netdevice notifier to detect DSA presence")
> Signed-off-by: Dipendra Khadka <kdipendra88@...il.com>

Reviewed-by: Simon Horman <horms@...nel.org>

> ---
> v5: 
>  -Removed extra parentheses
> v4: https://lore.kernel.org/all/20240925152927.4579-1-kdipendra88@gmail.com/
>  - Removed wrong and used correct Fixes: tag
> v3: https://lore.kernel.org/all/20240924185634.2358-1-kdipendra88@gmail.com/
>  - Updated patch subject
>  - Updated patch description
>  - Added Fixes: tags
>  - Fixed typo from PRT_ERR to PTR_ERR
>  - Error is checked just after  assignment
> v2: https://lore.kernel.org/all/20240923053900.1310-1-kdipendra88@gmail.com/
>  - Change the subject of the patch to net
> v1: https://lore.kernel.org/all/20240922181739.50056-1-kdipendra88@gmail.com/
>  drivers/net/ethernet/broadcom/bcmsysport.c | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/broadcom/bcmsysport.c b/drivers/net/ethernet/broadcom/bcmsysport.c
> index c9faa8540859..a7ad829f11d4 100644
> --- a/drivers/net/ethernet/broadcom/bcmsysport.c
> +++ b/drivers/net/ethernet/broadcom/bcmsysport.c
> @@ -2331,11 +2331,15 @@ static const struct net_device_ops bcm_sysport_netdev_ops = {
>  static int bcm_sysport_map_queues(struct net_device *dev,
>  				  struct net_device *slave_dev)
>  {
> -	struct dsa_port *dp = dsa_port_from_netdev(slave_dev);
>  	struct bcm_sysport_priv *priv = netdev_priv(dev);
>  	struct bcm_sysport_tx_ring *ring;
>  	unsigned int num_tx_queues;
>  	unsigned int q, qp, port;
> +	struct dsa_port *dp;
> +
> +	dp = dsa_port_from_netdev(slave_dev);
> +	if (IS_ERR(dp))
> +		return PTR_ERR(dp);
>  
>  	/* We can't be setting up queue inspection for non directly attached
>  	 * switches
> @@ -2386,11 +2390,15 @@ static int bcm_sysport_map_queues(struct net_device *dev,
>  static int bcm_sysport_unmap_queues(struct net_device *dev,
>  				    struct net_device *slave_dev)
>  {
> -	struct dsa_port *dp = dsa_port_from_netdev(slave_dev);
>  	struct bcm_sysport_priv *priv = netdev_priv(dev);
>  	struct bcm_sysport_tx_ring *ring;
>  	unsigned int num_tx_queues;
>  	unsigned int q, qp, port;
> +	struct dsa_port *dp;
> +
> +	dp = dsa_port_from_netdev(slave_dev);
> +	if (IS_ERR(dp))
> +		return PTR_ERR(dp);
>  
>  	port = dp->index;
>  
> -- 
> 2.43.0
>