linux-kernel - Re: [PATCH] soc: qcom: pmic_glink: Make client-lock non-sleeping

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Date: Wed, 1 May 2024 14:30:51 -0500
From: Andrew Halaney <ahalaney@...hat.com>
To: Bjorn Andersson <andersson@...nel.org>
Cc: Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, Mukesh Ojha <quic_mojha@...cinc.com>, 
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Bjorn Andersson <quic_bjorande@...cinc.com>
Subject: Re: [PATCH] soc: qcom: pmic_glink: Make client-lock non-sleeping

On Tue, Apr 30, 2024 at 08:38:57PM -0700, Bjorn Andersson wrote:
> From: Bjorn Andersson <quic_bjorande@...cinc.com>
> 
> The recently introduced commit '635ce0db8956 ("soc: qcom: pmic_glink:
> don't traverse clients list without a lock")' ensured that the clients
> list is not modified while traversed.
> 
> But the callback is made from the GLINK IRQ handler and as such this
> mutual exclusion can not be provided by a (sleepable) mutex.
> 
> Replace the mutex with a spinlock.
> 
> Fixes: 635ce0db8956 ("soc: qcom: pmic_glink: don't traverse clients list without a lock")
> Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>

Reviewed-by: Andrew Halaney <ahalaney@...hat.com>