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Ben Widawsky 1a305bda15 acpi: fix acpi_ec_probe to only check EC devices
This patch utilizes the fixed_devclass attribute in order to make sure
other acpi devices with params don't get confused for an EC device.

The existing code assumes that acpi_ec_probe is only ever called with a
dereferencable acpi param. Aside from being incorrect because other
devices of ACPI_TYPE_DEVICE may be probed here which aren't ec devices,
(and they may have set acpi private data), it is even more nefarious if
another ACPI driver uses private data which is not dereferancable. This
will result in a pointer deref during boot and therefore boot failure.

On X86, as it stands today, no other devices actually do this (acpi_cpu
checks for PROCESSOR type devices) and so there is no issue. I ran into
this because I am adding such a device which gets probed before
acpi_ec_probe and sets private data. If ARM ever has an EC, I think
they'd run into this issue as well.

There have been several iterations of this patch. Earlier
iterations had ECDT enumerated ECs not call into the probe/attach
functions of this driver. This change was Suggested by: jhb@.

Reviewed by:    jhb
Approved by:	emaste (mentor)
Differential Revision:  https://reviews.freebsd.org/D16635
2018-11-19 18:29:03 +00:00
2018-11-19 02:30:12 +00:00
2018-10-31 20:42:18 +00:00
2018-11-18 12:23:03 +00:00

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