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author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-04-20 18:19:35 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-04-20 18:19:35 (GMT) |
commit | 19244ad06b70ed84931df868583547ce1cd3a186 (patch) | |
tree | 5ebe6d43bd493f61492ff92fe957c7a44418fa8f /drivers/acpi/acpica/hwxface.c | |
parent | b3dc627cabb33fc95f93da78457770c1b2a364d2 (diff) | |
download | linux-fsl-qoriq-19244ad06b70ed84931df868583547ce1cd3a186.tar.xz |
Revert "ACPI: ignore FADT reset-reg-sup flag"
This reverts commit cf450136bfde77c7f95065c91bffded4aa7fa731.
It breaks reboot on at least one Thinkpad T43, as reported by Jörg Otte:
"On reboot it shuts down as normal.
The last lines displayed are:
>Unmounting temporary filesystems.. [OK]
>Deactivating swap... [OK]
>Unmounting local filesystems... [OK]
>Will now restart
> Restarting system
Then I hear it accessing the cd-drive, but then it's being stuck."
Jörg bisected the regression to this commit.
That commit fixes another machine (see
https://bugzilla.kernel.org/show_bug.cgi?id=11533
for details) that has a BIOS bug and doesn't support ACPI reset.
However, at least one of those other reporters no longer even has the
machine in question, and had a different workaround to begin with.
Besides, it clearly was a buggy BIOS. Let's not break the correct case
to fix that case.
Reported-and-bisected-by: Jörg Otte <jrg.otte@googlemail.com>
Cc: linux-acpi@vger.kernel.org
Cc: Len Brown <lenb@kernel.org>
Cc: Peter Anvin <hpa@zytor.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/acpi/acpica/hwxface.c')
-rw-r--r-- | drivers/acpi/acpica/hwxface.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/acpi/acpica/hwxface.c b/drivers/acpi/acpica/hwxface.c index ab513a9..a716fed 100644 --- a/drivers/acpi/acpica/hwxface.c +++ b/drivers/acpi/acpica/hwxface.c @@ -74,7 +74,8 @@ acpi_status acpi_reset(void) /* Check if the reset register is supported */ - if (!reset_reg->address) { + if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) || + !reset_reg->address) { return_ACPI_STATUS(AE_NOT_EXIST); } |