From: javi.merino@arm.com (Javi Merino)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: pl330: Fix a race condition
Date: Wed, 05 Oct 2011 13:57:09 +0100 [thread overview]
Message-ID: <4E8C5425.80303@arm.com> (raw)
In-Reply-To: <4E7896D8.5090606@arm.com>
On 20/09/11 14:36, Javi Merino wrote:
> On 19/09/11 19:07, Jassi Brar wrote:
>> IIUIC your race scenario should be taken care of simply by doing...
>>
>> diff --git a/arch/arm/common/pl330.c b/arch/arm/common/pl330.c
>> index 97912fa..7129cfb 100644
>> --- a/arch/arm/common/pl330.c
>> +++ b/arch/arm/common/pl330.c
>> @@ -1546,7 +1546,7 @@ int pl330_chan_ctrl(void *ch_id, enum pl330_chan_op op)
>>
>> /* Start the next */
>> case PL330_OP_START:
>> - if (!_start(thrd))
>> + if (!_thrd_active(thrd) && !_start(thrd))
>> ret = -EIO;
>> break;
>>
>
> My first reaction was this was just moving the race condition, but
> thinking about it carefully, it looks like a better (simpler) solution.
>
>> Could you please test if it fixes the issue?
>
> Yes, I'll kick off runs later today and see how it goes. I don't have a
> way to reproduce the bug consistently, I just do lots of DMA
> transactions and eventually, I end up hitting it. I'll run it overnight
> and see if it fixes it or not.
I have run a lot of tests using your patch and I haven't been able to
reproduce the bug so your proposed solution is probably a better
(simpler) fix than mine.
Cheers,
Javi
next prev parent reply other threads:[~2011-10-05 12:57 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-19 17:11 [PATCH] ARM: pl330: Fix a race condition Javi Merino
2011-09-19 18:07 ` Jassi Brar
2011-09-20 13:36 ` Javi Merino
2011-10-05 12:57 ` Javi Merino [this message]
2011-10-06 9:10 ` [PATCH v2] " Javi Merino
2011-11-05 19:05 ` Thomas Abraham
2011-11-07 10:48 ` Javi Merino
2011-11-07 11:03 ` Thomas Abraham
2011-11-28 8:23 ` Boojin Kim
2011-11-28 16:36 ` Javi Merino
2011-11-29 3:41 ` Boojin Kim
2011-11-29 9:53 ` Javi Merino
2011-11-29 10:37 ` Jassi Brar
2011-12-07 7:52 ` Kukjin Kim
2011-12-07 10:01 ` Javi Merino
2011-12-07 20:54 ` Javi Merino
2011-12-09 11:58 ` Javi Merino
2011-12-09 13:04 ` Jassi Brar
2011-12-09 13:41 ` Javi Merino
2011-12-09 14:15 ` Jassi Brar
2011-12-09 14:52 ` Javi Merino
2011-12-09 16:50 ` Jassi Brar
2011-12-09 19:50 ` Javi Merino
2011-12-11 10:51 ` Jassi Brar
2011-12-11 15:09 ` Javi Merino
2011-12-11 17:10 ` Jassi Brar
2011-12-11 17:42 ` Javi Merino
2011-12-11 19:27 ` [PATCH] ARM: PL330: Fix driver freeze Javi Merino
2011-12-15 17:48 ` Javi Merino
2011-12-16 9:01 ` Tushar Behera
2011-12-16 6:27 ` Jassi Brar
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