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ARM: 7803/1: 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.

Reported-by: Sundarajan Srinivasan <sundaraj@codeaurora.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Stephen Boyd 2013-07-30 23:09:46 +01:00 committed by Russell King
parent 067e710b9a
commit 44424c3404
1 changed files with 3 additions and 0 deletions
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3
arch/arm/kernel/process.c
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@ -197,6 +197,7 @@ void machine_shutdown(void)
*/
void machine_halt(void)
{
local_irq_disable();
smp_send_stop();
local_irq_disable();
@ -211,6 +212,7 @@ void machine_halt(void)
*/
void machine_power_off(void)
{
local_irq_disable();
smp_send_stop();
if (pm_power_off)
@ -230,6 +232,7 @@ void machine_power_off(void)
*/
void machine_restart(char *cmd)
{
local_irq_disable();
smp_send_stop();
arm_pm_restart(reboot_mode, cmd);