linux-kernel - Re: [PATCH 6/8] hwspinlock: sprd: Use devm_hwspin_lock

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Date:   Tue, 26 Jun 2018 13:51:38 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Baolin Wang <baolin.wang@...aro.org>
Cc:     ohad@...ery.com, broonie@...nel.org, linux-spi@...r.kernel.org,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/8] hwspinlock: sprd: Use devm_hwspin_lock_register()

On Fri 22 Jun 01:09 PDT 2018, Baolin Wang wrote:

> Use devm_hwspin_lock_register() to register the hwlock controller to
> avoid unregistering the device explicitly.
> 
> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
> ---
>  drivers/hwspinlock/sprd_hwspinlock.c |    6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/hwspinlock/sprd_hwspinlock.c b/drivers/hwspinlock/sprd_hwspinlock.c
> index dc42bf5..ba5daf6 100644
> --- a/drivers/hwspinlock/sprd_hwspinlock.c
> +++ b/drivers/hwspinlock/sprd_hwspinlock.c
> @@ -120,8 +120,9 @@ static int sprd_hwspinlock_probe(struct platform_device *pdev)
>  	platform_set_drvdata(pdev, sprd_hwlock);
>  	pm_runtime_enable(&pdev->dev);
>  
> -	ret = hwspin_lock_register(&sprd_hwlock->bank, &pdev->dev,
> -				   &sprd_hwspinlock_ops, 0, SPRD_HWLOCKS_NUM);
> +	ret = devm_hwspin_lock_register(&pdev->dev, &sprd_hwlock->bank,
> +					&sprd_hwspinlock_ops, 0,
> +					SPRD_HWLOCKS_NUM);
>  	if (ret) {
>  		pm_runtime_disable(&pdev->dev);
>  		clk_disable_unprepare(sprd_hwlock->clk);
> @@ -135,7 +136,6 @@ static int sprd_hwspinlock_remove(struct platform_device *pdev)
>  {
>  	struct sprd_hwspinlock_dev *sprd_hwlock = platform_get_drvdata(pdev);
>  
> -	hwspin_lock_unregister(&sprd_hwlock->bank);

Until the hwspinlock is unregistered it's possible for clients to issue
operations on it, so disabling power and clocks before that seems bad.

Regards,
Bjorn

>  	pm_runtime_disable(&pdev->dev);
>  	clk_disable_unprepare(sprd_hwlock->clk);
>  	return 0;
> -- 
> 1.7.9.5
>