netdev - Re: [PATCH net] pktgen: do not sleep with the thread lock held.

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Message-Id: <20190605.120559.1335640243691845984.davem@davemloft.net>
Date:   Wed, 05 Jun 2019 12:05:59 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     pabeni@...hat.com
Cc:     netdev@...r.kernel.org, mcroce@...hat.com
Subject: Re: [PATCH net] pktgen: do not sleep with the thread lock held.

From: Paolo Abeni <pabeni@...hat.com>
Date: Wed,  5 Jun 2019 14:34:46 +0200

> @@ -3062,20 +3062,49 @@ static int thread_is_running(const struct pktgen_thread *t)
>  	return 0;
>  }
>  
> -static int pktgen_wait_thread_run(struct pktgen_thread *t)
> +static bool pktgen_lookup_thread(struct pktgen_net *pn, struct pktgen_thread *t)
> +{
> +	struct pktgen_thread *tmp;
> +
> +	list_for_each_entry(tmp, &pn->pktgen_threads, th_list)
> +		if (tmp == t)
> +			return true;
> +	return false;
> +}

Pointer equality is not object equality.

It is possible for a pktgen thread to be terminated, a new one started,
and the new one to have the same pointer value as the old one.