arm64: Fix deadlock scenario with smp_send_stop()

If one process calls sys_reboot and that process then stops other
CPUs while those CPUs are within a spin_lock() region we can
potentially encounter a deadlock scenario like below.

CPU 0                   CPU 1
-----                   -----
                        spin_lock(my_lock)
smp_send_stop()
 <send IPI>             handle_IPI()
                         disable_preemption/irqs
                          while(1);
 <PREEMPT>
spin_lock(my_lock) <--- Waits forever

We shouldn't attempt to run any other tasks after we send a stop
IPI to a CPU so disable preemption so that this task runs to
completion. We use local_irq_disable() here for cross-arch
consistency with x86.

Based-on-work-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Arun KS <getarunks@gmail.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index ed37c36..43b7c34 100644 (file)
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -135,6 +135,7 @@ void machine_shutdown(void)
  */
 void machine_halt(void)
 {
+       local_irq_disable();
        smp_send_stop();
        while (1);
 }
@@ -147,6 +148,7 @@ void machine_halt(void)
  */
 void machine_power_off(void)
 {
+       local_irq_disable();
        smp_send_stop();
        if (pm_power_off)
                pm_power_off();
@@ -165,10 +167,9 @@ void machine_power_off(void)
  */
 void machine_restart(char *cmd)
 {
-       smp_send_stop();
-
        /* Disable interrupts first */
        local_irq_disable();
+       smp_send_stop();
 
        /* Now call the architecture specific reboot code. */
        if (arm_pm_restart)