linux-kernel - Re: [PATCH v3 09/12] bus: mhi: core: Check for IRQ availability during registration

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Message-ID: <20201030140216.GK3818@Mani-XPS-13-9360>
Date:   Fri, 30 Oct 2020 19:32:16 +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 v3 09/12] bus: mhi: core: Check for IRQ availability
 during registration

On Thu, Oct 29, 2020 at 09:10:54PM -0700, Bhaumik Bhatt wrote:
> Current design allows a controller to register with MHI successfully
> without the need to have any IRQs available for use. If no IRQs are
> available, power up requests to MHI can fail after a successful
> registration with MHI. Improve the design by checking for the number
> of IRQs available sooner within the mhi_regsiter_controller() API as
> it is required to be specified by the controller.
> 
> Signed-off-by: Bhaumik Bhatt <bbhatt@...eaurora.org>

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

Thanks,
Mani

> ---
>  drivers/bus/mhi/core/init.c | 2 +-
>  drivers/bus/mhi/core/pm.c   | 3 ---
>  2 files changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
> index 23b6dd6..5dd9e39 100644
> --- a/drivers/bus/mhi/core/init.c
> +++ b/drivers/bus/mhi/core/init.c
> @@ -858,7 +858,7 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl,
>  
>  	if (!mhi_cntrl->runtime_get || !mhi_cntrl->runtime_put ||
>  	    !mhi_cntrl->status_cb || !mhi_cntrl->read_reg ||
> -	    !mhi_cntrl->write_reg)
> +	    !mhi_cntrl->write_reg || !mhi_cntrl->nr_irqs)
>  		return -EINVAL;
>  
>  	ret = parse_config(mhi_cntrl, config);
> diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
> index 06adea2..1d04e401 100644
> --- a/drivers/bus/mhi/core/pm.c
> +++ b/drivers/bus/mhi/core/pm.c
> @@ -926,9 +926,6 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl)
>  
>  	dev_info(dev, "Requested to power ON\n");
>  
> -	if (mhi_cntrl->nr_irqs < 1)
> -		return -EINVAL;
> -
>  	/* Supply default wake routines if not provided by controller driver */
>  	if (!mhi_cntrl->wake_get || !mhi_cntrl->wake_put ||
>  	    !mhi_cntrl->wake_toggle) {
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>