linux-kernel - Re: [PATCH V4 1/6] regmap: irq: add apis to unmap the mapped irq

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]

Message-ID: <56B9AC8C.2020209@nvidia.com>
Date:	Tue, 9 Feb 2016 14:38:28 +0530
From:	Laxman Dewangan <ldewangan@...dia.com>
To:	Mark Brown <broonie@...nel.org>
CC:	Thomas Gleixner <tglx@...utronix.de>, <lee.jones@...aro.org>,
	<alexandre.belloni@...e-electrons.com>, <k.kozlowski@...sung.com>,
	<javier@....samsung.com>, <gregkh@...uxfoundation.org>,
	<a.zummo@...ertech.it>, <cw00.choi@...sung.com>,
	<linux-kernel@...r.kernel.org>, <rtc-linux@...glegroups.com>
Subject: Re: [PATCH V4 1/6] regmap: irq: add apis to unmap the mapped irq


On Tuesday 09 February 2016 10:46 AM, Laxman Dewangan wrote:
>
> On Monday 08 February 2016 11:49 PM, Mark Brown wrote:
>> * PGP Signed by an unknown key
>>
>> On Mon, Feb 08, 2016 at 10:26:20PM +0530, Laxman Dewangan wrote:
>>
>>> So fix need to go in the irq_domain_remove() to unamp before actually
>>> destroying the irq domain?
>> That's one option, but you could also do this at the regmap-irq level.
>>
>
> Do we need to dispose all virtual irq in regmap_del_irq_chip() before 
> actually removing domain?
> This means we need to store the created virq  in regmap_irq_chip_data 
> for disposing it when removing the irq domain.

It is easy for me to communicate through code to avoid any confusion. So 
do you want to say as follows? In this case, there is no need of any new 
API.

  void regmap_del_irq_chip(int irq, struct regmap_irq_chip_data *d)
  {
+       unsigned int virq;
+       int hwirq;
+
         if (!d)
                 return;

         free_irq(irq, d);
+
+       /* Unmap all virtual irq from this domain */
+       for (hwirq = 0; hwirq < d->chip->num_irqs; hwirq++) {
+               if (!d->chip->irqs[irq].mask)
+                       continue;
+
+               /* Get virtual irq of hwirq on chip if already mapped */
+               virq = irq_find_mapping(d->domain, hwirq);
+               if (virq)
+                       irq_dispose_mapping(virq);
+       }
+