arm64: psci: Avoid printing in cpu_psci_cpu_die()

[ Upstream commit 891deb87585017d526b67b59c15d38755b900fea ]

cpu_psci_cpu_die() is called in the context of the dying CPU, which
will no longer be online or tracked by RCU. It is therefore not generally
safe to call printk() if the PSCI "cpu off" request fails, so remove the
pr_crit() invocation.

Cc: Qian Cai <cai@redhat.com>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20201106103602.9849-2-will@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/arm64/kernel/psci.c b/arch/arm64/kernel/psci.c
index 3856d51c645b596ef4c0489979005738176904ae..3ebb2a56e5f7bb812b9ec07660c66331cefeae50 100644 (file)
--- a/arch/arm64/kernel/psci.c
+++ b/arch/arm64/kernel/psci.c
@@ -69,7 +69,6 @@ static int cpu_psci_cpu_disable(unsigned int cpu)
 
 static void cpu_psci_cpu_die(unsigned int cpu)
 {
-       int ret;
        /*
         * There are no known implementations of PSCI actually using the
         * power state field, pass a sensible default for now.
@@ -77,9 +76,7 @@ static void cpu_psci_cpu_die(unsigned int cpu)
        u32 state = PSCI_POWER_STATE_TYPE_POWER_DOWN <<
                    PSCI_0_2_POWER_STATE_TYPE_SHIFT;
 
-       ret = psci_ops.cpu_off(state);
-
-       pr_crit("unable to power off CPU%u (%d)\n", cpu, ret);
+       psci_ops.cpu_off(state);
 }
 
 static int cpu_psci_cpu_kill(unsigned int cpu)