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| author | Shaohua Li <shaohua.li@intel.com> | 2009-12-23 17:04:11 +0800 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2009-12-23 17:42:07 -0500 |
| commit | 9dc130fccb874f2959ef313d7922d306dc6d4f75 (patch) | |
| tree | ae4e402b1a960adbc9c7d4b858f5dc5385a4b96f | |
| parent | 3563ff964fdc36358cef0330936fdac28e65142a (diff) | |
| download | linux-9dc130fccb874f2959ef313d7922d306dc6d4f75.tar.gz linux-9dc130fccb874f2959ef313d7922d306dc6d4f75.tar.bz2 linux-9dc130fccb874f2959ef313d7922d306dc6d4f75.zip | |
ACPI: fix OSC regression that caused aer and pciehp not to load
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@kernel.org>
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
| -rw-r--r-- | 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 65f7e335f122..0c1ad3105da1 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); |