linux-kernel - Re: [PATCH] kdbus: do not append the same connection to the queue twice

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Message-id: <552CCF79.4050903@samsung.com>
Date:	Tue, 14 Apr 2015 10:27:37 +0200
From:	Lukasz Skalski <l.skalski@...sung.com>
To:	Sergei Zviagintsev <sergei@...v.net>
Cc:	gregkh@...uxfoundation.org, daniel@...que.org,
	dh.herrmann@...il.com, tixxdz@...ndz.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kdbus: do not append the same connection to the queue twice


On 04/13/2015 11:48 PM, Sergei Zviagintsev wrote:
> Hi Lukasz,
> 

Hi,

> On Mon, Apr 13, 2015 at 04:14:06PM +0200, Lukasz Skalski wrote:
>> As it was discussed on systemd ML [1], the same connection should be
>> queued up only once for a given well-known name.
>>
>> [1] http://lists.freedesktop.org/archives/systemd-devel/2015-April/030494.html
>>
>> Signed-off-by: Lukasz Skalski <l.skalski@...sung.com>
>>
>> diff --git a/ipc/kdbus/names.c b/ipc/kdbus/names.c
>> index 657008e..a546a84 100644
>> --- a/ipc/kdbus/names.c
>> +++ b/ipc/kdbus/names.c
>> @@ -353,10 +353,23 @@ int kdbus_name_acquire(struct kdbus_name_registry *reg,
>>  	} else if (flags & KDBUS_NAME_QUEUE) {
>>  		/* add to waiting-queue of the name */
>>  
>> -		ret = kdbus_name_pending_new(e, conn, flags);
>> -		if (ret >= 0)
>> -			/* tell the caller that we queued it */
>> -			rflags |= KDBUS_NAME_IN_QUEUE;
>> +		struct kdbus_name_pending *p;
>> +		bool in_queue = false;
>> +
>> +		list_for_each_entry(p, &e->queue, name_entry) {
>> +			if (p->conn == conn) {
>> +				/* connection is already queued */
>> +				rflags |= KDBUS_NAME_IN_QUEUE;
>> +				in_queue = true;
> 
> break here?
> 

Right. I've just sent v2. Thanks!

>> +			}
>> +		}
>> +
>> +		if (!in_queue) {
>> +			ret = kdbus_name_pending_new(e, conn, flags);
>> +			if (ret >= 0)
>> +				/* tell the caller that we queued it */
>> +				rflags |= KDBUS_NAME_IN_QUEUE;
>> +		}
>>  	} else {
>>  		/* the name is busy, return a failure */
>>  		ret = -EEXIST;
>> -- 
>> 1.9.3
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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> 

Cheers,
-- 
Lukasz Skalski
Samsung R&D Institute Poland
Samsung Electronics
l.skalski@...sung.com
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