Re: [PATCH v1 1/1] scsi: ufshcd: Allow zero value setting to Auto-Hibernate Timer

[Bart Van Assche <bvanassche@acm.org>]

On 2020-08-28 18:05, Bao D. Nguyen wrote:
>  static ssize_t auto_hibern8_show(struct device *dev,
>  				 struct device_attribute *attr, char *buf)
>  {
> +	u32 ahit;
>  	struct ufs_hba *hba = dev_get_drvdata(dev);

Although not strictly required for SCSI code, how about following the "reverse
christmas tree" convention and adding "u32 ahit" below the "hba" declaration?

>  	if (!ufshcd_is_auto_hibern8_supported(hba))
>  		return -EOPNOTSUPP;
>  
> -	return snprintf(buf, PAGE_SIZE, "%d\n", ufshcd_ahit_to_us(hba->ahit));
> +	pm_runtime_get_sync(hba->dev);
> +	ufshcd_hold(hba, false);
> +	ahit = ufshcd_readl(hba, REG_AUTO_HIBERNATE_IDLE_TIMER);
> +	ufshcd_release(hba);
> +	pm_runtime_put_sync(hba->dev);
> +
> +	return scnprintf(buf, PAGE_SIZE, "%d\n", ufshcd_ahit_to_us(ahit));
>  }

Why the pm_runtime_get_sync()/pm_runtime_put_sync() and
ufshcd_hold()/ufshcd_release() calls? I don't think these are necessary here.

Thanks,

Bart.