linux-kernel - Re: [PATCH V4 8/8] backlight: qcom-wled: Add auto string detection logic

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 16 Aug 2018 11:03:18 +0530
From:   kgunda@...eaurora.org
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     jingoohan1@...il.com, lee.jones@...aro.org,
        b.zolnierkie@...sung.com, dri-devel@...ts.freedesktop.org,
        daniel.thompson@...aro.org, jacek.anaszewski@...il.com,
        pavel@....cz, robh+dt@...nel.org, mark.rutland@....com,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-fbdev@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-arm-msm-owner@...r.kernel.org
Subject: Re: [PATCH V4 8/8] backlight: qcom-wled: Add auto string detection
 logic

On 2018-08-07 12:02, Bjorn Andersson wrote:
> On Mon 09 Jul 03:22 PDT 2018, Kiran Gunda wrote:
>> diff --git a/drivers/video/backlight/qcom-wled.c 
>> b/drivers/video/backlight/qcom-wled.c
> [..]
>> @@ -189,6 +206,15 @@ static int wled4_set_brightness(struct wled 
>> *wled, u16 brightness)
>>  	return 0;
>>  }
>> 
>> +static void wled_ovp_work(struct work_struct *work)
>> +{
>> +	struct wled *wled = container_of(work,
>> +					 struct wled, ovp_work.work);
>> +
>> +	if (wled->ovp_irq > 0)
>> +		enable_irq(wled->ovp_irq);
>> +}
>> +
>>  static int wled_module_enable(struct wled *wled, int val)
>>  {
>>  	int rc;
>> @@ -200,7 +226,18 @@ static int wled_module_enable(struct wled *wled, 
>> int val)
>>  				WLED_CTRL_REG_MOD_EN,
>>  				WLED_CTRL_REG_MOD_EN_MASK,
>>  				val << WLED_CTRL_REG_MOD_EN_SHIFT);
>> -	return rc;
>> +	if (rc < 0)
>> +		return rc;
>> +
>> +	if (val) {
>> +		schedule_delayed_work(&wled->ovp_work, WLED_SOFT_START_DLY_US);
> 
> schedule_delayed_work() takes a delay in jiffies, not micro seconds.
> 
I will address it in the next series.
>> +	} else {
>> +		cancel_delayed_work_sync(&wled->ovp_work);
> 
> If we get here within WLED_SOFT_START_DLY_US of a module enable we have
> yet to execute the enable_irq() in the delayed worker, which should 
> mean
> that the irq is unbalanced from then on.
> 
> I believe you can check the return value of cancel_delayed_work_sync()
> being true to know if wled_ovp_work() was yet to execute.
> 
Ok. I will address it in next series.
>> +		if (wled->ovp_irq > 0)
>> +			disable_irq(wled->ovp_irq);
>> +	}
>> +
>> +	return 0;
>>  }
>> 
> 
> Regards,
> Bjorn
> --
> To unsubscribe from this list: send the line "unsubscribe 
> linux-arm-msm" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html