linux-kernel - Re: [PATCH] i2c: Allow recovery of the initial IRQ by a i2c client device.

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Message-ID: <CAKgEEwsOHqV-PtJnc-5nXAuH3BVitXWt80eoENJa3wZ6vGZDpw@mail.gmail.com>
Date:   Mon, 18 Feb 2019 10:25:10 -0800
From:   Jim Broadus <jbroadus@...il.com>
To:     Charles Keepax <ckeepax@...nsource.cirrus.com>
Cc:     benjamin.tissoires@...hat.com, wsa@...-dreams.de,
        linux-i2c@...r.kernel.org,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] i2c: Allow recovery of the initial IRQ by a i2c client device.

Thank you Charles. I should probably correct the typos in my commit message.

On Mon, Feb 18, 2019 at 2:06 AM Charles Keepax
<ckeepax@...nsource.cirrus.com> wrote:
>
> On Fri, Feb 15, 2019 at 04:15:33PM -0800, Jim Broadus wrote:
> > A previous change allowed i2c client devices to discover new IRQs upon
> > reprobe. By clearing the IRQ in i2c_device_remove. However, if an IRQ was
> > assigned in i2c_new_device, that information is lost.
> >
> > For example, the touchscreen and trackpad devices on a Dell Inspiron laptop
> > are I2C devices whose IRQs are defined by ACPI extended IRQ types. The
> > client device structures are initialized during an ACPI walk. After
> > removing the i2c_hid device, modprobe fails.
> >
> > This change caches the initial IRQ value in i2c_new_device and then resets
> > the client device IRQ to the initial value in i2c_device_remove.
> >
> > Fixes: 6f108dd70d30 ("i2c: Clear client->irq in i2c_device_remove")
> > Signed-off-by: Jim Broadus <jbroadus@...il.com>
> > ---
>
> Reviewed-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
>
> Apologies for the issues caused. I think this looks like a good fix
> to me.
>
> Thanks,
> Charles