linux-kernel - Re: [ 47/53] dca: check against empty dca_domains list before unregister provider

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Date:	Thu, 28 Feb 2013 23:17:25 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
CC:	stable@...r.kernel.org, Jiang Liu <jiang.liu@...wei.com>,
	Gaohuai Han <hangaohuai@...wei.com>,
	Maciej Sosnowski <maciej.sosnowski@...el.com>,
	Dan Williams <djbw@...com>
Subject: Re: [ 47/53] dca: check against empty dca_domains list before unregister
 provider

On 02/28/2013 11:04 PM, Jiri Slaby wrote:
> On 02/27/2013 12:58 AM, Greg Kroah-Hartman wrote:
>> 3.0-stable review patch.  If anyone has any objections, please let me know.
>>
>> ------------------
>>
>> From: Maciej Sosnowski <maciej.sosnowski@...el.com>
>>
>> commit c419fcfd071cf34ba00f9f65282583772d2655e7 upstream.
>>
>> When providers get blocked unregister_dca_providers() is called ending up
>> with dca_providers and dca_domain lists emptied. Dca should be prevented from
>> trying to unregister any provider if dca_domain list is found empty.
>>
>> Reported-by: Jiang Liu <jiang.liu@...wei.com>
>> Tested-by: Gaohuai Han <hangaohuai@...wei.com>
>> Signed-off-by: Maciej Sosnowski <maciej.sosnowski@...el.com>
>> Signed-off-by: Dan Williams <djbw@...com>
>> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>>
>> ---
>>  drivers/dca/dca-core.c |    5 +++++
>>  1 file changed, 5 insertions(+)
>>
>> --- a/drivers/dca/dca-core.c
>> +++ b/drivers/dca/dca-core.c
>> @@ -409,6 +409,11 @@ void unregister_dca_provider(struct dca_
>>  
>>  	spin_lock_irqsave(&dca_lock, flags);
>>  
>> +	if (list_empty(&dca_domains)) {
>> +		raw_spin_unlock_irqrestore(&dca_lock, flags);
> 
> Hi, this is an incorrect backport. It should be spin_unlock_irqrestore
> obviously...

Fix attached.

-- 
js
suse labs

View attachment "dca-check-against-empty-dca_domains-list-before-fix.patch" of type "text/x-patch" (1181 bytes)