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path: root/drivers/pci/pci-acpi.c
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Diffstat (limited to 'drivers/pci/pci-acpi.c')
-rw-r--r--drivers/pci/pci-acpi.c18
1 files changed, 11 insertions, 7 deletions
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index dfe7c8e1b185..ae5ec76dca77 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -63,7 +63,7 @@ static acpi_status acpi_run_osc(acpi_handle handle,
union acpi_object in_params[4];
struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
union acpi_object *out_obj;
- u32 osc_dw0, flags = osc_args->capbuf[OSC_QUERY_TYPE];
+ u32 errors, flags = osc_args->capbuf[OSC_QUERY_TYPE];
/* Setting up input parameters */
input.count = 4;
@@ -83,21 +83,25 @@ static acpi_status acpi_run_osc(acpi_handle handle,
if (ACPI_FAILURE(status))
return status;
+ if (!output.length)
+ return AE_NULL_OBJECT;
+
out_obj = output.pointer;
if (out_obj->type != ACPI_TYPE_BUFFER) {
printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n");
status = AE_TYPE;
goto out_kfree;
}
- osc_dw0 = *((u32 *)out_obj->buffer.pointer);
- if (osc_dw0) {
- if (osc_dw0 & OSC_REQUEST_ERROR)
+ /* Need to ignore the bit0 in result code */
+ errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
+ if (errors) {
+ if (errors & OSC_REQUEST_ERROR)
printk(KERN_DEBUG "_OSC request fails\n");
- if (osc_dw0 & OSC_INVALID_UUID_ERROR)
+ if (errors & OSC_INVALID_UUID_ERROR)
printk(KERN_DEBUG "_OSC invalid UUID\n");
- if (osc_dw0 & OSC_INVALID_REVISION_ERROR)
+ if (errors & OSC_INVALID_REVISION_ERROR)
printk(KERN_DEBUG "_OSC invalid revision\n");
- if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) {
+ if (errors & OSC_CAPABILITIES_MASK_ERROR) {
if (flags & OSC_QUERY_ENABLE)
goto out_success;
printk(KERN_DEBUG "_OSC FW not grant req. control\n");