Thread (9 messages) 9 messages, 4 authors, 2015-09-28

[PATCH v4 0/5] Provide better MADT subtable sanity checks

From: rafael@kernel.org (Rafael J. Wysocki)
Date: 2015-09-28 21:13:08
Also in: linux-acpi, linux-pm, lkml

On Mon, Sep 28, 2015 at 10:17 PM, Al Stone [off-list ref] wrote:
On 09/25/2015 05:29 PM, Rafael J. Wysocki wrote:
quoted
On Wednesday, September 16, 2015 05:26:40 PM Al Stone wrote:
[cut]
quoted
In particular, I'm not sure if we really need to return
-EINVAL from acpi_parse_entries_array() when we find a bad MADT entry or it
will be sufficient to simply go to the next entry in that case?

Thanks,
Rafael
I see there being two options: (1) return -EINVAL and indicate that the tables
are incorrect, or (2) print a warning (or something more aggressive?), go to
the next entry, and hope for the best with the remainder of the MADT subtables.
The former is consistent with past behavior, I think, and the latter seems to
me a bit of a gamble.  So, my vote is for (1), the current method; what are you
thinking these days?
I would be for preserving the past behavior.

I'm a bit concerned that the new checks may trigger on systems where
the old ones didn't, but that is a separete problem.

Thanks,
Rafael
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