[PATCH AUTOSEL 4.4 2/2] arm64: psci: Avoid printing in cpu_psci_cpu_die()

[Sasha Levin]

From: Will Deacon <will at kernel.org>

[ 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 at redhat.com>
Cc: "Paul E. McKenney" <paulmck at kernel.org>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Link: https://lore.kernel.org/r/20201106103602.9849-2-will@kernel.org
Signed-off-by: Will Deacon <will at kernel.org>
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
 arch/arm64/kernel/psci.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/arch/arm64/kernel/psci.c b/arch/arm64/kernel/psci.c
index e6ad81556575c..ae91d202b7475 100644
--- a/arch/arm64/kernel/psci.c
+++ b/arch/arm64/kernel/psci.c
@@ -136,7 +136,6 @@ 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.
@@ -144,9 +143,7 @@ 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)
-- 
2.27.0