linux-kernel - Re: [PATCH v1 03/10] bus: mhi: core: Skip device wake in error or shutdown states

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Message-ID: <20201009155419.GD4810@Mani-XPS-13-9360>
Date:   Fri, 9 Oct 2020 21:24:19 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Bhaumik Bhatt <bbhatt@...eaurora.org>
Cc:     linux-arm-msm@...r.kernel.org, hemantk@...eaurora.org,
        jhugo@...eaurora.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 03/10] bus: mhi: core: Skip device wake in error or
 shutdown states

On Fri, Sep 18, 2020 at 07:02:28PM -0700, Bhaumik Bhatt wrote:
> MHI clients can request a device wake even if the device may be in an
> error state or undergoing shutdown. To prevent unnecessary device wake
> processing, check for the device state and bail out early so that the
> clients are made aware of the device state sooner.
> 

Please use the term "client drivers" everywhere. With that,

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

Thanks,
Mani

> Signed-off-by: Bhaumik Bhatt <bbhatt@...eaurora.org>
> ---
>  drivers/bus/mhi/core/pm.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
> index 9d4789d..1862960 100644
> --- a/drivers/bus/mhi/core/pm.c
> +++ b/drivers/bus/mhi/core/pm.c
> @@ -827,6 +827,10 @@ int __mhi_device_get_sync(struct mhi_controller *mhi_cntrl)
>  
>  	/* Wake up the device */
>  	read_lock_bh(&mhi_cntrl->pm_lock);
> +	if (MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) {
> +		read_unlock_bh(&mhi_cntrl->pm_lock);
> +		return -EIO;
> +	}
>  	mhi_cntrl->wake_get(mhi_cntrl, true);
>  	if (MHI_PM_IN_SUSPEND_STATE(mhi_cntrl->pm_state))
>  		mhi_trigger_resume(mhi_cntrl);
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>