dell-laptop: If there is no hwswitch, then clear all hw-controlled bits
To ensure we don't enter any hw-switch related code paths on machines without
a hw-switch.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index bae932b..48fabf6 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -548,6 +548,9 @@
buffer->input[0] = 0x2;
dell_send_request(buffer, 17, 11);
hwswitch_state = buffer->output[1];
+ /* If there is no hwswitch, then clear all hw-controlled bits */
+ if (!(status & BIT(0)))
+ hwswitch_state &= ~7;
release_buffer();
if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {