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[PATCH] fix "ACPI: Processor native C-states using MWAIT" 

This patch breaks C-state discovery on my IBM IntelliStation Z30 because
the return value of acpi_processor_get_power_info_fadt is not assigned to
"result" in the case that acpi_processor_get_power_info_cst returns
-ENODEV.  Thus, if ACPI provides C-state data via the FADT and not _CST (as
is the case on this machine), we incorrectly exit the function with -ENODEV
after reading the FADT.  The attached patch sets the value of result so
that we don't exit early.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Acked-by: "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>
Acked-by: "Brown, Len" <len.brown@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
hifive-unleashed-5.1
Darrick J. Wong 2006-10-19 23:28:28 -07:00 committed by Linus Torvalds
parent 74e8b51d25
commit c5a114f1fb
1 changed files with 1 additions and 1 deletions
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2
drivers/acpi/processor_idle.c
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@ -962,7 +962,7 @@ static int acpi_processor_get_power_info(struct acpi_processor *pr)
result = acpi_processor_get_power_info_cst(pr);
if (result == -ENODEV)
acpi_processor_get_power_info_fadt(pr);
result = acpi_processor_get_power_info_fadt(pr);
if (result)
return result;