From: Shaohua Li <shaohua.li@xxxxxxxxx>
Executing _OSC returns a buffer, which has an acpi object in it.
Don't directly returns the buffer, instead, we return the acpi object's
buffer. This fixes a regression since caller of acpi_run_osc expects
an acpi object's buffer returned.
Tested-by: Yinghai Lu <yinghai@xxxxxxxxxx>
Signed-off-by: Shaohua Li <shaohua.li@xxxxxxxxx>
Signed-off-by: Len Brown <len.brown@xxxxxxxxx>
---
drivers/acpi/bus.c | 26 ++++++++++++++++++--------
1 files changed, 18 insertions(+), 8 deletions(-)
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 65f7e33..0c1ad31 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -397,6 +397,7 @@ acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
union acpi_object *out_obj;
u8 uuid[16];
u32 errors;
+ struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
if (!context)
return AE_ERROR;
@@ -419,16 +420,16 @@ acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
in_params[3].buffer.length = context->cap.length;
in_params[3].buffer.pointer = context->cap.pointer;
- status = acpi_evaluate_object(handle, "_OSC", &input, &context->ret);
+ status = acpi_evaluate_object(handle, "_OSC", &input, &output);
if (ACPI_FAILURE(status))
return status;
- /* return buffer should have the same length as cap buffer */
- if (context->ret.length != context->cap.length)
+ if (!output.length)
return AE_NULL_OBJECT;
- out_obj = context->ret.pointer;
- if (out_obj->type != ACPI_TYPE_BUFFER) {
+ out_obj = output.pointer;
+ if (out_obj->type != ACPI_TYPE_BUFFER
+ || out_obj->buffer.length != context->cap.length) {
acpi_print_osc_error(handle, context,
"_OSC evaluation returned wrong type");
status = AE_TYPE;
@@ -457,11 +458,20 @@ acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
goto out_kfree;
}
out_success:
- return AE_OK;
+ context->ret.length = out_obj->buffer.length;
+ context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
+ if (!context->ret.pointer) {
+ status = AE_NO_MEMORY;
+ goto out_kfree;
+ }
+ memcpy(context->ret.pointer, out_obj->buffer.pointer,
+ context->ret.length);
+ status = AE_OK;
out_kfree:
- kfree(context->ret.pointer);
- context->ret.pointer = NULL;
+ kfree(output.pointer);
+ if (status != AE_OK)
+ context->ret.pointer = NULL;
return status;
}
EXPORT_SYMBOL(acpi_run_osc);
--
1.6.0.6
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