linux-kernel - Re: [PATCH v5 2/8] acpi: fix enumeration (visited) flags for bus rescans

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Date:	Thu, 7 Jul 2016 12:28:21 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Octavian Purdila <octavian.purdila@...el.com>
Cc:	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Mark Brown <broonie@...nel.org>,
	Wolfram Sang <wsa@...-dreams.de>,
	Joel Becker <jlbec@...lplan.org>, linux-acpi@...r.kernel.org,
	linux-efi@...r.kernel.org, linux-i2c@...r.kernel.org,
	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
	irina.tirdea@...el.com, leonard.crestez@...el.com
Subject: Re: [PATCH v5 2/8] acpi: fix enumeration (visited) flags for bus
 rescans

On Fri, Jul 01, 2016 at 11:19:06PM +0300, Octavian Purdila wrote:
> If the ACPI tables changes as a result of a dinamically loaded table and
> a bus rescan is required the enumeration/visited flag are not
> consistent.
> 
> I2C/SPI are not directly enumerated in acpi_bus_attach(), however the
> visited flag is set. This makes it impossible to check if an ACPI device
> has already been enumerated by the I2C and SPI subsystems. To fix this
> issue we only set the visited flags if the device is not I2C or SPI.
> 
> With this change we also need to remove setting visited to false from
> acpi_bus_attach(), otherwise if we rescan already enumerated I2C/SPI
> devices we try to re-enumerate them.
> 
> Note that I2C/SPI devices can be enumerated either via a scan handler
> (when using PRP0001) or via regular device_attach(). In either case
> the flow goes through acpi_default_enumeration() which makes it the
> ideal place to mark the ACPI device as enumerated.
> 
> Signed-off-by: Octavian Purdila <octavian.purdila@...el.com>

Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>