linux-kernel - Re: drivers/gpu/drm/nouveau/nvkm/engine/fifo/base.c:70:2-8: preceding lock on line 67

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Date:	Thu, 15 Oct 2015 09:31:44 +1000
From:	Ben Skeggs <bskeggs@...hat.com>
To:	Julia Lawall <julia.lawall@...6.fr>
Cc:	kbuild-all@...org, linux-kernel@...r.kernel.org
Subject: Re: drivers/gpu/drm/nouveau/nvkm/engine/fifo/base.c:70:2-8: preceding
 lock on line 67

On 10/14/2015 10:30 PM, Julia Lawall wrote:
> Please check whether not releasing the lock is intentional.
It's intentional, there's a nvkm_fifo_chan_put() that releases it again,
which should be used everywhere a successful acquire has occurred.

Ben.

> 
> julia
> 
> On Wed, 14 Oct 2015, kbuild test robot wrote:
> 
>> CC: kbuild-all@...org
>> CC: linux-kernel@...r.kernel.org
>> TO: Ben Skeggs <bskeggs@...hat.com>
>>
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   5b5f1455272e23f4e7889cec37228802d8d01adf
>> commit: 344c2d429dd86b1b0113177e18f15adb74e9d936 drm/nouveau/fb: remove dependence on namedb/engctx lookup
>> date:   7 weeks ago
>> :::::: branch date: 16 hours ago
>> :::::: commit date: 7 weeks ago
>>
>>>> drivers/gpu/drm/nouveau/nvkm/engine/fifo/base.c:70:2-8: preceding lock on line 67
>>
>> git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>> git remote update linus
>> git checkout 344c2d429dd86b1b0113177e18f15adb74e9d936
>> vim +70 drivers/gpu/drm/nouveau/nvkm/engine/fifo/base.c
>>
>> 344c2d42 Ben Skeggs 2015-08-20  61  }
>> 344c2d42 Ben Skeggs 2015-08-20  62
>> 344c2d42 Ben Skeggs 2015-08-20  63  struct nvkm_fifo_chan *
>> 344c2d42 Ben Skeggs 2015-08-20  64  nvkm_fifo_chan_chid(struct nvkm_fifo *fifo, int chid, unsigned long *rflags)
>> 344c2d42 Ben Skeggs 2015-08-20  65  {
>> 344c2d42 Ben Skeggs 2015-08-20  66  	unsigned long flags;
>> 344c2d42 Ben Skeggs 2015-08-20 @67  	spin_lock_irqsave(&fifo->lock, flags);
>> 344c2d42 Ben Skeggs 2015-08-20  68  	if (fifo->channel[chid]) {
>> 344c2d42 Ben Skeggs 2015-08-20  69  		*rflags = flags;
>> 344c2d42 Ben Skeggs 2015-08-20 @70  		return (void *)fifo->channel[chid];
>> 344c2d42 Ben Skeggs 2015-08-20  71  	}
>> 344c2d42 Ben Skeggs 2015-08-20  72  	spin_unlock_irqrestore(&fifo->lock, flags);
>> 344c2d42 Ben Skeggs 2015-08-20  73  	return NULL;
>>
>> ---
>> 0-DAY kernel test infrastructure                Open Source Technology Center
>> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
>>


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