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cpu/hotplug: Ignore pm_wakeup_pending() for disable_nonboot_cpus() 

A recent change to freeze_secondary_cpus() which added an early abort if a
wakeup is pending missed the fact that the function is also invoked for
shutdown, reboot and kexec via disable_nonboot_cpus().

In case of disable_nonboot_cpus() the wakeup event needs to be ignored as
the purpose is to terminate the currently running kernel.

Add a 'suspend' argument which is only set when the freeze is in context of
a suspend operation. If not set then an eventually pending wakeup event is
ignored.

Fixes: a66d955e91 ("cpu/hotplug: Abort disabling secondary CPUs if wakeup is pending")
Reported-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Pavankumar Kondeti <pkondeti@codeaurora.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/874kuaxdiz.fsf@nanos.tec.linutronix.de
This commit is contained in:
Thomas Gleixner 2020-03-27 12:06:44 +01:00
parent 33c3736ec8
commit e98eac6ff1
2 changed files with 11 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
include/linux/cpu.h
View File

@ -144,12 +144,18 @@ static inline void get_online_cpus(void) { cpus_read_lock(); }
static inline void put_online_cpus(void) { cpus_read_unlock(); }
#ifdef CONFIG_PM_SLEEP_SMP
extern int freeze_secondary_cpus(int primary);
int __freeze_secondary_cpus(int primary, bool suspend);
static inline int freeze_secondary_cpus(int primary)
{
return __freeze_secondary_cpus(primary, true);
}
static inline int disable_nonboot_cpus(void)
{
return freeze_secondary_cpus(0);
return __freeze_secondary_cpus(0, false);
}
extern void enable_nonboot_cpus(void);
void enable_nonboot_cpus(void);
static inline int suspend_disable_secondary_cpus(void)
{

4
kernel/cpu.c
View File

@ -1327,7 +1327,7 @@ void bringup_nonboot_cpus(unsigned int setup_max_cpus)
#ifdef CONFIG_PM_SLEEP_SMP
static cpumask_var_t frozen_cpus;
int freeze_secondary_cpus(int primary)
int __freeze_secondary_cpus(int primary, bool suspend)
{
int cpu, error = 0;
@ -1352,7 +1352,7 @@ int freeze_secondary_cpus(int primary)
if (cpu == primary)
continue;
if (pm_wakeup_pending()) {
if (suspend && pm_wakeup_pending()) {
pr_info("Wakeup pending. Abort CPU freeze\n");
error = -EBUSY;
break;