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Fix ACPI processor power block initialization 

Properly clear the memory, and set "pr->flags.power" only if a C2 or
deeper state is valid (to make the code match both the comment and
previous behaviour).

This fixes a boot-time lockup reported by Maneesh Soni when using
"maxcpus=1".

Acked-by: Maneesh Soni <maneesh@in.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
hifive-unleashed-5.1
Linus Torvalds 2005-11-18 07:29:51 -08:00
parent 2656c076e3
commit 2203d6ed44
1 changed files with 4 additions and 10 deletions
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14
drivers/acpi/processor_idle.c
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@ -514,8 +514,6 @@ static int acpi_processor_set_power_policy(struct acpi_processor *pr)
static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr)
{
int i;
ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_fadt");
if (!pr)
@ -524,8 +522,7 @@ static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr)
if (!pr->pblk)
return_VALUE(-ENODEV);
for (i = 0; i < ACPI_PROCESSOR_MAX_POWER; i++)
memset(pr->power.states, 0, sizeof(struct acpi_processor_cx));
memset(pr->power.states, 0, sizeof(pr->power.states));
/* if info is obtained from pblk/fadt, type equals state */
pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1;
@ -555,13 +552,9 @@ static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr)
static int acpi_processor_get_power_info_default_c1(struct acpi_processor *pr)
{
int i;
ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_default_c1");
for (i = 0; i < ACPI_PROCESSOR_MAX_POWER; i++)
memset(&(pr->power.states[i]), 0,
sizeof(struct acpi_processor_cx));
memset(pr->power.states, 0, sizeof(pr->power.states));
/* if info is obtained from pblk/fadt, type equals state */
pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1;
@ -873,7 +866,8 @@ static int acpi_processor_get_power_info(struct acpi_processor *pr)
for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
if (pr->power.states[i].valid) {
pr->power.count = i;
pr->flags.power = 1;
if (pr->power.states[i].type >= ACPI_STATE_C2)
pr->flags.power = 1;
}
}