From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Hans de Goede <hdegoede@redhat.com>
Cc: Darren Hart <dvhart@infradead.org>,
platform-driver-x86@vger.kernel.org,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
linux-acpi@vger.kernel.org, Jonathan Cameron <jic23@kernel.org>,
Wolfram Sang <wsa@the-dreams.de>,
Mika Westerberg <mika.westerberg@linux.intel.com>,
linux-i2c@vger.kernel.org,
Heikki Krogerus <heikki.krogerus@linux.intel.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1 06/15] i2c: acpi: Assign fwnode for devices created via i2c_acpi_new_device()
Date: Wed, 21 Nov 2018 15:35:49 +0200 [thread overview]
Message-ID: <20181121133549.GL10650@smile.fi.intel.com> (raw)
In-Reply-To: <c2ad13ad-cf27-2700-a051-4dda56755ebd@redhat.com>
On Wed, Nov 21, 2018 at 12:44:27PM +0100, Hans de Goede wrote:
> On 20-11-18 16:59, Andy Shevchenko wrote:
> > i2c_acpi_new_device() doesn't assign fwnode like it's done, for example,
> > in i2c_acpi_register_devices() path.
> >
> > Assign fwnode in i2c_acpi_new_device() as it's done elsewhere.
> As already mentioned in my reply to the cover letter, a NACK from me for
> this one.
>
> The problem is that this causes the fwnode to be shared by all the
> "struct device"-s (embedded in the i2c-clients created).
>
> This in itself is not necessarily a problem, but it does become a
> problem when combined with using device_add_properties as
> intel_cht_int33fe.c does.
>
> Since the info in the ACPI tables for devices which use this
> driver is pretty terrible, we add a bunch of properties to notify
> the drivers about how the different parts which make up the Type-C
> functionality are tied together.
>
> device_add_properties creates a new fwnode and then calls
> set_secondary_fwnode. For devices which already have a fwnode
> assigned (which the i2c-clients will have after this patch)
> set_secondary_fwnode sets dev->fwnode->secondary to the fwnode
> which has been newly created to hold the added properties.
>
> Since all i2c-clients instantiated now share dev->fwnode,
> the result of this is that all i2c-clients created now will
> have the properties of the last i2c-client instantiated for
> an acpi-node which describes multiple clients in a single
> node.
>
> Also the fwnodes created for the properties of earlier
> instantiated i2c-clients will be leaked.
Thanks for this very detailed problem report.
>
> I see 2 possible solutions here:
>
> 1) Changing this patch so that i2c_acpi_new_device() does:
>
> /*
> * The fwnode can not be shared between instantiated clients when
> * adding device-properties to the instantiated client.
> */
> if (!info->properties)
> info->fwnode = acpi_fwnode_handle(adev);
>
> 2) Leave whether info->fwnode should be set or not up to the
> caller of i2c_acpi_new_device() (info is already passed in as
> a param). E.g. i2c-multi-instantiate.c could do this (for now,
> maybe in the future we will also want to add properties for
> some HIDs).
>
> I think that 1. is the best solution and this is all kernel internal,
> so we can always revisit this if necessary.
Heikki told me he has some ideas, but for now I will drop this patch.
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2018-11-21 13:35 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-20 15:59 [PATCH v1 00/15] i2c-multi-instantiate: Adapt for INT3515 and alike Andy Shevchenko
2018-11-20 15:59 ` [PATCH v1 01/15] platform/x86: intel_cht_int33fe: Remove duplicate NULL check Andy Shevchenko
2018-11-20 15:59 ` [PATCH v1 02/15] platform/x86: intel_cht_int33fe: Accept errors of i2c_acpi_new_device() Andy Shevchenko
2018-11-20 15:59 ` [PATCH v1 03/15] platform/x86: i2c-multi-instantiate: " Andy Shevchenko
2018-11-20 15:59 ` [PATCH v1 04/15] platform/x86: i2c-mutli-instantiate: Defer probe when no adapter found Andy Shevchenko
2018-11-20 15:59 ` [PATCH v1 05/15] i2c: acpi: Return error pointers from i2c_acpi_new_device() Andy Shevchenko
2018-11-20 15:59 ` [PATCH v1 06/15] i2c: acpi: Assign fwnode for devices created via i2c_acpi_new_device() Andy Shevchenko
2018-11-21 11:44 ` Hans de Goede
2018-11-21 13:35 ` Andy Shevchenko [this message]
2018-11-21 14:15 ` Heikki Krogerus
2018-11-20 15:59 ` [PATCH v1 07/15] i2c: acpi: Use ACPI_FAILURE instead of !ACPI_SUCCESS Andy Shevchenko
2018-11-20 15:59 ` [PATCH v1 08/15] i2c: acpi: Introduce i2c_acpi_get_i2c_resource() helper Andy Shevchenko
2018-11-20 15:59 ` [PATCH v1 09/15] platform/x86: i2c-multi-instantiate: Count I2cSerialBus() resources Andy Shevchenko
2018-11-21 12:03 ` Hans de Goede
2018-11-26 14:32 ` Andy Shevchenko
2018-11-20 15:59 ` [PATCH v1 10/15] platform/x86: i2c-multi-instantiate: Distinguish IRQ resource type Andy Shevchenko
2018-11-20 15:59 ` [PATCH v1 11/15] platform/x86: i2c-multi-instantiate: Introduce IOAPIC IRQ support Andy Shevchenko
2018-11-20 15:59 ` [PATCH v1 12/15] platform/x86: i2c-multi-instantiate: Allow to have same slaves Andy Shevchenko
2018-11-20 15:59 ` [PATCH v1 13/15] ACPI / scan: Create platform device for INT3515 ACPI nodes Andy Shevchenko
2018-11-20 15:59 ` [PATCH v1 14/15] ACPI / scan: Create platform device for BOSC0200 " Andy Shevchenko
2018-11-21 12:29 ` Hans de Goede
2018-11-20 15:59 ` [PATCH v1 15/15] iio: inv_mpu6050: Use i2c_acpi_get_i2c_resource() helper Andy Shevchenko
2018-11-21 11:27 ` [PATCH v1 00/15] i2c-multi-instantiate: Adapt for INT3515 and alike Hans de Goede
2018-11-21 12:00 ` Hans de Goede
2018-11-26 14:55 ` Andy Shevchenko
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