[PATCH] firmware: psci: Fix return value from psci_system_suspend()

[Sudeep Holla]

Currently we return the value from invoke_psci_fn() directly as return
value from psci_system_suspend(). It is wrong to send the PSCI interface
return value directly. psci_to_linux_errno() provide the mapping from
PSCI return value to the one that can be returned to the callers within
the kernel.

Use psci_to_linux_errno() to convert and return the correct value from
psci_system_suspend().

Fixes: faf7ec4a92c0 ("drivers: firmware: psci: add system suspend support")
Signed-off-by: Sudeep Holla <sudeep.holla at arm.com>
---
 drivers/firmware/psci/psci.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Hi,

For some reason, this has gone unnoticed for years. I bumped into this when
I was trying to test suspend on FVP which claims to support but returns error
when called. The error was getting not communicated properly(incorrect
error code) before this patch.

Regards,
Sudeep

diff --git a/drivers/firmware/psci/psci.c b/drivers/firmware/psci/psci.c
index d9629ff87861..2328ca58bba6 100644
--- a/drivers/firmware/psci/psci.c
+++ b/drivers/firmware/psci/psci.c
@@ -497,10 +497,12 @@ int psci_cpu_suspend_enter(u32 state)

 static int psci_system_suspend(unsigned long unused)
 {
+	int err;
 	phys_addr_t pa_cpu_resume = __pa_symbol(cpu_resume);

-	return invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND),
+	err = invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND),
 			      pa_cpu_resume, 0, 0);
+	return psci_to_linux_errno(err);
 }

 static int psci_system_suspend_enter(suspend_state_t state)
--
2.42.0