linux-kernel - Re: [PATCH v2 0/5] iio: treewide: rearrange iio trig get/register

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Date:   Tue, 31 May 2022 18:20:34 +0000
From:   Dmitry Rokosov <DDRokosov@...rdevices.ru>
To:     Jonathan Cameron <jic23@...nel.org>
CC:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "andy.shevchenko@...il.com" <andy.shevchenko@...il.com>,
        "lorenzo.bianconi83@...il.com" <lorenzo.bianconi83@...il.com>,
        "srinivas.pandruvada@...ux.intel.com" 
        <srinivas.pandruvada@...ux.intel.com>,
        "teodora.baluta@...el.com" <teodora.baluta@...el.com>,
        "narcisaanamaria12@...il.com" <narcisaanamaria12@...il.com>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        kernel <kernel@...rdevices.ru>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/5] iio: treewide: rearrange iio trig get/register

Jonathan,

I've submitted the patch with runtime WARN() as you suggested:

https://lore.kernel.org/linux-iio/20220531181457.26034-1-ddrokosov@sberdevices.ru/

On Sat, May 28, 2022 at 06:10:04PM +0100, Jonathan Cameron wrote:
> > If this call order is wrong, the next iio_trigger_put() (from sysfs
> > callback or "delete module" path) will dereference "default" module
> > refcnt, which is incorrect behaviour.
> 
> Hi Dmitry,
> 
> Series applied to the fixes-togreg branch of iio.git and marked for stable.
> 
> Do you think it's also worth adding a runtime warning in iio_trigger_get()
> on !trig->owner so that we catch any cases of this introduced in the future?
> 

-- 
Thank you,
Dmitry