During _OSC negotiation, when the 'Control' DWORD is needed from the
result buffer after running _OSC, a couple of places performed manual
pointer arithmetic to offset into the right spot in the raw buffer.
Add a acpi_osc_ctx_get_pci_control() helper to use the #define'd
DWORD offsets to fetch the DWORDs needed from @acpi_osc_context, and
replace the above instances of the open-coded arithmetic.
Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
Suggested-by: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Signed-off-by: Vishal Verma <vishal.l.verma@xxxxxxxxx>
---
include/linux/acpi.h | 12 ++++++++++++
drivers/acpi/bus.c | 2 +-
drivers/acpi/pci_root.c | 2 +-
3 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 6274758648e3..5c5bac255d35 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -607,6 +607,13 @@ extern u32 osc_sb_native_usb4_control;
#define OSC_PCI_EXPRESS_LTR_CONTROL 0x00000020
#define OSC_PCI_EXPRESS_DPC_CONTROL 0x00000080
+static inline u32 acpi_osc_ctx_get_pci_control(struct acpi_osc_context *context)
+{
+ u32 *ret = context->ret.pointer;
+
+ return ret[OSC_CONTROL_DWORD];
+}
+
#define ACPI_GSB_ACCESS_ATTRIB_QUICK 0x00000002
#define ACPI_GSB_ACCESS_ATTRIB_SEND_RCV 0x00000004
#define ACPI_GSB_ACCESS_ATTRIB_BYTE 0x00000006
@@ -1003,6 +1010,11 @@ static inline int acpi_register_wakeup_handler(int wake_irq,
static inline void acpi_unregister_wakeup_handler(
bool (*wakeup)(void *context), void *context) { }
+static inline u32 acpi_osc_ctx_get_pci_control(struct acpi_osc_context *context)
+{
+ return 0;
+}
+
#endif /* !CONFIG_ACPI */
#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 07f604832fd6..4992e05cf429 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -405,7 +405,7 @@ static void acpi_bus_osc_negotiate_usb_control(void)
}
osc_sb_native_usb4_control =
- control & ((u32 *)context.ret.pointer)[OSC_CONTROL_DWORD];
+ control & acpi_osc_ctx_get_pci_control(&context);
acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
acpi_bus_decode_usb_osc("USB4 _OSC: OS controls",
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index b76db99cced3..40a74ff3fa02 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -185,7 +185,7 @@ static acpi_status acpi_pci_run_osc(acpi_handle handle,
status = acpi_run_osc(handle, &context);
if (ACPI_SUCCESS(status)) {
- *retval = *((u32 *)(context.ret.pointer + 8));
+ *retval = acpi_osc_ctx_get_pci_control(&context);
kfree(context.ret.pointer);
}
return status;
--
2.35.1
