linux-kernel - Re: [PATCH] tty: synclink_gt: release resources when synclink

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Date:   Mon, 14 Nov 2022 06:44:29 +0100
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Zhengchao Shao <shaozhengchao@...wei.com>,
        linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org
Cc:     akpm@...ux-foundation.org, paulkf@...rogate.com,
        weiyongjun1@...wei.com, yuehaibing@...wei.com
Subject: Re: [PATCH] tty: synclink_gt: release resources when synclink_gt
 driver open failed

On 14. 11. 22, 2:07, Zhengchao Shao wrote:
> When synclink_gt driver open failed, it doesn't release resources.

But hdlc_close() does. Now, you call it (apart from the TTY layer) too.

> Compile tested only.

Hmm, NACK.

> Fixes: d4c63b7c7450 ("synclink_gt fix module reference")
> Fixes: 705b6c7b34f2 ("[PATCH] new driver synclink_gt")
> Signed-off-by: Zhengchao Shao <shaozhengchao@...wei.com>
> ---
>   drivers/tty/synclink_gt.c | 13 ++++++++++---
>   1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/tty/synclink_gt.c b/drivers/tty/synclink_gt.c
> index 25e9befdda3a..4dea52486410 100644
> --- a/drivers/tty/synclink_gt.c
> +++ b/drivers/tty/synclink_gt.c
> @@ -1441,14 +1441,15 @@ static int hdlcdev_open(struct net_device *dev)
>   	/* generic HDLC layer open processing */
>   	rc = hdlc_open(dev);
>   	if (rc)
> -		return rc;
> +		goto err_open;
>   
>   	/* arbitrate between network and tty opens */
>   	spin_lock_irqsave(&info->netlock, flags);
>   	if (info->port.count != 0 || info->netcount != 0) {
>   		DBGINFO(("%s hdlc_open busy\n", dev->name));
>   		spin_unlock_irqrestore(&info->netlock, flags);
> -		return -EBUSY;
> +		rc = -EBUSY;
> +		goto err_open_busy;
>   	}
>   	info->netcount=1;
>   	spin_unlock_irqrestore(&info->netlock, flags);
> @@ -1458,7 +1459,7 @@ static int hdlcdev_open(struct net_device *dev)
>   		spin_lock_irqsave(&info->netlock, flags);
>   		info->netcount=0;
>   		spin_unlock_irqrestore(&info->netlock, flags);
> -		return rc;
> +		goto err_open_busy;
>   	}
>   
>   	/* assert RTS and DTR, apply hardware settings */
> @@ -1478,6 +1479,12 @@ static int hdlcdev_open(struct net_device *dev)
>   	else
>   		netif_carrier_off(dev);
>   	return 0;
> +
> +err_open_busy:
> +	hdlc_close(dev);
> +err_open:
> +	module_put(THIS_MODULE);
> +	return rc;
>   }
>   
>   /**

-- 
js
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