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From:   Suzuki K Poulose <suzuki.poulose@arm.com>
To:     Junhao He <hejunhao3@huawei.com>, anshuman.khandual@arm.com,
        james.clark@arm.com, mike.leach@linaro.org
Cc:     Suzuki K Poulose <suzuki.poulose@arm.com>, linuxarm@huawei.com,
        prime.zeng@hisilicon.com, yangyicong@huawei.com,
        jonathan.cameron@huawei.com, coresight@lists.linaro.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH V3] coresight: trbe: Fix TRBE potential sleep in atomic context
Date:   Fri, 18 Aug 2023 17:30:09 +0100
Message-Id: <169237411247.697015.1763852652455357854.b4-ty@arm.com>
In-Reply-To: <20230818084052.10116-1-hejunhao3@huawei.com>
References: <20230818084052.10116-1-hejunhao3@huawei.com>
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On Fri, 18 Aug 2023 16:40:52 +0800, Junhao He wrote:
> smp_call_function_single() will allocate an IPI interrupt vector to
> the target processor and send a function call request to the interrupt
> vector. After the target processor receives the IPI interrupt, it will
> execute arm_trbe_remove_coresight_cpu() call request in the interrupt
> handler.
> 
> According to the device_unregister() stack information, if other process
> is useing the device, the down_write() may sleep, and trigger deadlocks
> or unexpected errors.
> 
> [...]

Applied, thanks!

[1/1] coresight: trbe: Fix TRBE potential sleep in atomic context
      https://git.kernel.org/coresight/c/c0a232f1e19e3

Best regards,
-- 
Suzuki K Poulose <suzuki.poulose@arm.com>