linux-kernel - Re: [patch] dca: missing unlock in unregister_dca

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Date:	Fri, 19 Nov 2010 14:59:37 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Dan Carpenter <error27@...il.com>
Cc:	Maciej Sosnowski <maciej.sosnowski@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch] dca: missing unlock in unregister_dca_providers()

On Wed, 17 Nov 2010 08:10:32 +0300
Dan Carpenter <error27@...il.com> wrote:

> We return here with the lock held and IRQs disabled by mistake.
> 
> Signed-off-by: Dan Carpenter <error27@...il.com>
> 
> diff --git a/drivers/dca/dca-core.c b/drivers/dca/dca-core.c
> index b98c676..b4c95be 100644
> --- a/drivers/dca/dca-core.c
> +++ b/drivers/dca/dca-core.c
> @@ -110,8 +110,10 @@ static void unregister_dca_providers(void)
>  
>  	/* at this point only one domain in the list is expected */
>  	domain = list_first_entry(&dca_domains, struct dca_domain, node);
> -	if (!domain)
> +	if (!domain) {
> +		spin_unlock_irqrestore(&dca_lock, flags);
>  		return;
> +	}
>  
>  	list_for_each_entry_safe(dca, _dca, &domain->dca_providers, node) {
>  		list_del(&dca->node);

I think the code's just bogus, actually. 
list_first_entry(&dca_domains) can't return NULL.

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