linux-kernel - Re: [PATCH v3 3/4] scsi: ufs: add trace events and dump prints for debug

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Date:	Mon, 23 Feb 2015 12:12:42 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Gilad Broner <gbroner@...eaurora.org>
Cc:	James.Bottomley@...senPartnership.com,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, santoshsy@...il.com,
	linux-scsi-owner@...r.kernel.org, subhashj@...eaurora.org,
	ygardi@...eaurora.org, draviv@...eaurora.org,
	Lee Susman <lsusman@...eaurora.org>,
	Sujit Reddy Thumma <sthumma@...eaurora.org>,
	Vinayak Holikatti <vinholikatti@...il.com>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v3 3/4] scsi: ufs: add trace events and dump prints for
 debug

On Mon, 23 Feb 2015 10:08:16 +0200
Gilad Broner <gbroner@...eaurora.org> wrote:

> @@ -5551,14 +5956,23 @@ EXPORT_SYMBOL(ufshcd_system_suspend);
>  
>  int ufshcd_system_resume(struct ufs_hba *hba)
>  {
> +	int ret = 0;
> +	ktime_t start = ktime_get();
> +
>  	if (!hba || !hba->is_powered || pm_runtime_suspended(hba->dev))
>  		/*
>  		 * Let the runtime resume take care of resuming
>  		 * if runtime suspended.
>  		 */
> -		return 0;
> -
> -	return ufshcd_resume(hba, UFS_SYSTEM_PM);
> +		goto out;
> +	else
> +		ret = ufshcd_resume(hba, UFS_SYSTEM_PM);
> +out:

If I understand the patch above, you basically have:

	if (....)
		goto out;
	else
		ret = ufshcd_resume();
out:

Wouldn't it be better to just reverse the above if condition?

	if (!...)
		ret = ufshcd_resume();

That would be much less confusing.


> +	trace_ufshcd_system_resume(dev_name(hba->dev), ret,
> +		ktime_to_us(ktime_sub(ktime_get(), start)),
> +		ufschd_ufs_dev_pwr_mode_to_string(hba->curr_dev_pwr_mode),
> +		ufschd_uic_link_state_to_string(hba->uic_link_state));
> +	return ret;
>  }
>  EXPORT_SYMBOL(ufshcd_system_resume);
>  
> @@ -5572,10 +5986,19 @@ EXPORT_SYMBOL(ufshcd_system_resume);
>   */
>  int ufshcd_runtime_suspend(struct ufs_hba *hba)
>  {
> -	if (!hba || !hba->is_powered)
> -		return 0;
> +	int ret = 0;
> +	ktime_t start = ktime_get();
>  
> -	return ufshcd_suspend(hba, UFS_RUNTIME_PM);
> +	if (!hba || !hba->is_powered)
> +		goto out;
> +	else
> +		ret = ufshcd_suspend(hba, UFS_RUNTIME_PM);
> +out:

Here too.

> +	trace_ufshcd_runtime_suspend(dev_name(hba->dev), ret,
> +		ktime_to_us(ktime_sub(ktime_get(), start)),
> +		ufschd_ufs_dev_pwr_mode_to_string(hba->curr_dev_pwr_mode),
> +		ufschd_uic_link_state_to_string(hba->uic_link_state));
> +	return ret;
>  }
>  EXPORT_SYMBOL(ufshcd_runtime_suspend);
>  
> @@ -5602,10 +6025,19 @@ EXPORT_SYMBOL(ufshcd_runtime_suspend);
>   */
>  int ufshcd_runtime_resume(struct ufs_hba *hba)
>  {
> +	int ret = 0;
> +	ktime_t start = ktime_get();
> +
>  	if (!hba || !hba->is_powered)
> -		return 0;
> +		goto out;
>  	else
> -		return ufshcd_resume(hba, UFS_RUNTIME_PM);
> +		ret = ufshcd_resume(hba, UFS_RUNTIME_PM);
> +out:

And here.

-- Steve

> +	trace_ufshcd_runtime_resume(dev_name(hba->dev), ret,
> +		ktime_to_us(ktime_sub(ktime_get(), start)),
> +		ufschd_ufs_dev_pwr_mode_to_string(hba->curr_dev_pwr_mode),
> +		ufschd_uic_link_state_to_string(hba->uic_link_state));
> +	return ret;
>  }
>  EXPORT_SYMBOL(ufshcd_runtime_resume);
> 


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