linux-kernel - Re: [PATCH 2/2] coresight: trbe: Allocate platform data per device

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Message-ID: <f8f8ce42-889c-9a6b-5f74-121bd9dc09b1@arm.com>
Date:   Thu, 17 Aug 2023 15:46:03 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Suzuki K Poulose <suzuki.poulose@....com>,
        James Clark <james.clark@....com>, hejunhao3@...wei.com
Cc:     coresight@...ts.linaro.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, jonathan.cameron@...wei.com,
        leo.yan@...aro.org, mike.leach@...aro.org, linuxarm@...wei.com,
        yangyicong@...wei.com, prime.zeng@...ilicon.com
Subject: Re: [PATCH 2/2] coresight: trbe: Allocate platform data per device



On 8/17/23 15:31, Suzuki K Poulose wrote:
> On 17/08/2023 10:24, James Clark wrote:
>>
>>
>> On 17/08/2023 07:37, Anshuman Khandual wrote:
>>> Hi Suzuki,
>>>
>>> Seems like this patch is going to conflict with the below proposed change
>>>
>>> https://lore.kernel.org/all/20230817055405.249630-4-anshuman.khandual@arm.com/
>>>
>>> Please let me know how should we resolve this conflict.
>>
>> We could merge them both, with the fixes: one first, just to acknowledge
>> that there was a problem. But I suppose your one will have to be rebased
>> on top.
>>
>>>
>>> On 8/16/23 19:40, Suzuki K Poulose wrote:
>>>> Coresight TRBE driver shares a single platform data (which is empty btw).
>>>> However, with the commit 4e8fe7e5c3a5
>>>> ("coresight: Store pointers to connections rather than an array of them")
>>>> the coresight core would free up the pdata, resulting in multiple attempts
>>>> to free the same pdata for TRBE instances. Fix this by allocating a pdata per
>>>> coresight_device.
>>>>
>>>> Fixes: 3fbf7f011f24 ("coresight: sink: Add TRBE driver")
>>>
>>> The above mentioned commit i.e 4e8fe7e5c3a5 seems to be a more recent one which
>>> has triggered this problem. But would the problem be still there without that ?
>>> Else 'Fixes:' tag would need changing.
>>>
>>
>> Yes I think the fixes tag should point to 4e8fe7e5c3a5.
> 
> Agreed, I will change the fixes tag and push this.

In the first patch, the last hunk might not be required to fix the
IPI problem and in fact might be bit problematic as well. Besides,
could you please hold off pushing this change into coresight tree
for some time ?