linux-kernel - Re: [PATCH] drivers/perf: Fix kernel panic when rmmod PMU modules during perf sampling

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Message-ID: <bcf5623d-aba1-8cc2-6702-57020a8ae517@huawei.com>
Date:   Thu, 16 Jul 2020 12:09:47 +0100
From:   John Garry <john.garry@...wei.com>
To:     Will Deacon <will@...nel.org>
CC:     Robin Murphy <robin.murphy@....com>, Qi Liu <liuqi115@...wei.com>,
        <mark.rutland@....com>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...wei.com>, <zhangshaokun@...ilicon.com>,
        <wang.wanghaifeng@...wei.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] drivers/perf: Fix kernel panic when rmmod PMU modules
 during perf sampling

On 16/07/2020 11:44, Will Deacon wrote:
>> Please also note what Qi Liu wrote about being able to unbind the driver and
>> cause the same issue. I don't know if you can about that issue also.
> I guess we have to throw in some '.suppress_bind_attrs = true,' lines as
> well, then?

Yeah, I think it would be a follow up using suppress_bind_attrs. TBH, I 
don't know why this is an opt out feature, than an opt in. Probably a 
good reason...

  I'll queue this as-is, but happy to take a follow-up if somebody
> can test it.
> 

Thanks,
john