linux-kernel - Re: [PATCH] drivers/perf: Prevent forced unbinding of PMU drivers

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Message-Id: <159497953657.530785.13608435502860855695.b4-ty@kernel.org>
Date:   Fri, 17 Jul 2020 11:43:42 +0100
From:   Will Deacon <will@...nel.org>
To:     mark.rutland@....com, Qi Liu <liuqi115@...wei.com>,
        zhangshaokun@...ilicon.com, john.garry@...wei.com
Cc:     catalin.marinas@....com, kernel-team@...roid.com,
        Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org,
        linuxarm@...wei.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] drivers/perf: Prevent forced unbinding of PMU drivers

On Fri, 17 Jul 2020 16:49:23 +0800, Qi Liu wrote:
> Forcefully unbinding PMU drivers during perf sampling will lead to
> a kernel panic, because the perf upper-layer framework call a NULL
> pointer in this situation.
> 
> To solve this issue, "suppress_bind_attrs" should be set to true, so
> that bind/unbind can be disabled via sysfs and prevent unbinding PMU
> drivers during perf sampling.

Applied to arm64 (for-next/fixes), thanks!

[1/1] drivers/perf: Prevent forced unbinding of PMU drivers
      https://git.kernel.org/arm64/c/f32ed8eb0e3f

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev