linux-kernel - RE: [PATCH v3] Drivers: vmbus: Check for channel allocation before looking up relids

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Date:   Fri, 17 Feb 2023 23:17:04 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Mohammed Gamal <mgamal@...hat.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
        "parri.andrea@...il.com" <parri.andrea@...il.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        "vkuznets@...hat.com" <vkuznets@...hat.com>,
        "xxiong@...hat.com" <xxiong@...hat.com>
Subject: RE: [PATCH v3] Drivers: vmbus: Check for channel allocation before
 looking up relids

> From: Mohammed Gamal <mgamal@...hat.com>
> Sent: Friday, February 17, 2023 12:44 PM
> ...
> --- a/drivers/hv/connection.c
> +++ b/drivers/hv/connection.c
> @@ -409,6 +409,10 @@ void vmbus_disconnect(void)
>   */
>  struct vmbus_channel *relid2channel(u32 relid)
>  {
> +	if (vmbus_connection.channels == NULL) {
> +		pr_warn_once("relid2channel: relid=%d: No channels mapped!\n",
> relid);

Looks good to me except that the line exceeds 80 characters.
Please run "scripts/checkpatch.pl" to detect that.
For this patch, I guess Wei may be willing to help fix it.

> +		return NULL;
> +	}
>  	if (WARN_ON(relid >= MAX_CHANNEL_RELIDS))
>  		return NULL;
>  	return READ_ONCE(vmbus_connection.channels[relid]);
> --

Reviewed-by: Dexuan Cui <decui@...rosoft.com>