firmware: smccc: Fix check for ARCH_SOC_ID not implemented
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2052908
commit e95d8eaee21cd0d117d34125d4cdc97489c1ab82
Author: Michael Kelley <mikelley@microsoft.com>
Date: Fri Nov 19 15:39:01 2021 -0800
firmware: smccc: Fix check for ARCH_SOC_ID not implemented
The ARCH_FEATURES function ID is a 32-bit SMC call, which returns
a 32-bit result per the SMCCC spec. Current code is doing a 64-bit
comparison against -1 (SMCCC_RET_NOT_SUPPORTED) to detect that the
feature is unimplemented. That check doesn't work in a Hyper-V VM,
where the upper 32-bits are zero as allowed by the spec.
Cast the result as an 'int' so the comparison works. The change also
makes the code consistent with other similar checks in this file.
Fixes: 821b67fa4639 ("firmware: smccc: Add ARCH_SOC_ID support")
Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Vitaly Kuznetsov vkuznets@redhat.com
Edited by Vitaly Kuznetsov