linux-kernel - [PATCH] MIPS: Provide fallback reboot/poweroff/halt implementations

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Message-Id: <1425513563-9897-1-git-send-email-abrestic@chromium.org>
Date:	Wed,  4 Mar 2015 15:59:23 -0800
From:	Andrew Bresticker <abrestic@...omium.org>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
	Andrew Bresticker <abrestic@...omium.org>
Subject: [PATCH] MIPS: Provide fallback reboot/poweroff/halt implementations

If a machine-specific hook is not implemented for restart, poweroff,
or halt, fall back to halting secondary CPUs, disabling interrupts,
and spinning.  In the case of restart, attempt to restart the system
via do_kernel_restart() (which will call any registered restart
handlers) before halting.

Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
---
 arch/mips/kernel/reset.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/mips/kernel/reset.c b/arch/mips/kernel/reset.c
index 07fc524..87b1f08 100644
--- a/arch/mips/kernel/reset.c
+++ b/arch/mips/kernel/reset.c
@@ -29,16 +29,36 @@ void machine_restart(char *command)
 {
 	if (_machine_restart)
 		_machine_restart(command);
+
+#ifdef CONFIG_SMP
+	smp_send_stop();
+#endif
+	do_kernel_restart(command);
+	pr_emerg("Reboot failed -- System halted\n");
+	local_irq_disable();
+	while (1);
 }
 
 void machine_halt(void)
 {
 	if (_machine_halt)
 		_machine_halt();
+
+#ifdef CONFIG_SMP
+	smp_send_stop();
+#endif
+	local_irq_disable();
+	while (1);
 }
 
 void machine_power_off(void)
 {
 	if (pm_power_off)
 		pm_power_off();
+
+#ifdef CONFIG_SMP
+	smp_send_stop();
+#endif
+	local_irq_disable();
+	while (1);
 }
-- 
2.2.0.rc0.207.ga3a616c

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