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authorPavel Machek <pavel@suse.cz>2008-11-25 12:05:08 +0100
committerLen Brown <len.brown@intel.com>2008-11-26 17:39:06 -0500
commit40599072dca3ec7d4c9ff8271978be169f974638 (patch)
treec7a4f34e547aadb47644f57bb1c96a8ad9c24689 /drivers/acpi
parent558073dd56707864f09d563b64e7c37c021e89d2 (diff)
downloadlinux-linaro-android-40599072dca3ec7d4c9ff8271978be169f974638.tar.gz
ACPI: scheduling in atomic via acpi_evaluate_integer ()
Now I know why I had strange "scheduling in atomic" problems: acpi_evaluate_integer() does malloc(..., irqs_disabled() ? GFP_ATOMIC : GFP_KERNEL)... which is (of course) broken. There's no way to reliably tell if we need GFP_ATOMIC or not from code, this one for example fails to detect spinlocks held. Fortunately, allocation seems small enough to be done on stack. Signed-off-by: Pavel Machek <pavel@suse.cz> Acked-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/utils.c16
1 files changed, 4 insertions, 12 deletions
diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index e827be36ee8..f844941089b 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -259,34 +259,26 @@ acpi_evaluate_integer(acpi_handle handle,
struct acpi_object_list *arguments, unsigned long long *data)
{
acpi_status status = AE_OK;
- union acpi_object *element;
+ union acpi_object element;
struct acpi_buffer buffer = { 0, NULL };
-
if (!data)
return AE_BAD_PARAMETER;
- element = kzalloc(sizeof(union acpi_object), irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL);
- if (!element)
- return AE_NO_MEMORY;
-
buffer.length = sizeof(union acpi_object);
- buffer.pointer = element;
+ buffer.pointer = &element;
status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
if (ACPI_FAILURE(status)) {
acpi_util_eval_error(handle, pathname, status);
- kfree(element);
return status;
}
- if (element->type != ACPI_TYPE_INTEGER) {
+ if (element.type != ACPI_TYPE_INTEGER) {
acpi_util_eval_error(handle, pathname, AE_BAD_DATA);
- kfree(element);
return AE_BAD_DATA;
}
- *data = element->integer.value;
- kfree(element);
+ *data = element.integer.value;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%llu]\n", *data));