Since acpi_os_get_timer() may be called after the timer subsystem has been suspended, use the jiffies counter instead of ktime_get(). This patch avoids that the following warning is reported during hibernation:
WARNING: CPU: 0 PID: 612 at kernel/time/timekeeping.c:751 ktime_get+0x116/0x120 RIP: 0010:ktime_get+0x116/0x120 Call Trace: acpi_os_get_timer+0xe/0x30 acpi_ds_exec_begin_control_op+0x175/0x1de acpi_ds_exec_begin_op+0x2c7/0x39a acpi_ps_create_op+0x573/0x5e4 acpi_ps_parse_loop+0x349/0x1220 acpi_ps_parse_aml+0x25b/0x6da acpi_ps_execute_method+0x327/0x41b acpi_ns_evaluate+0x4e9/0x6f5 acpi_ut_evaluate_object+0xd9/0x2f2 acpi_rs_get_method_data+0x8f/0x114 acpi_walk_resources+0x122/0x1b6 acpi_pci_link_get_current.isra.2+0x157/0x280 acpi_pci_link_set+0x32f/0x4a0 irqrouter_resume+0x58/0x80 syscore_resume+0x84/0x380 hibernation_snapshot+0x20c/0x4f0 hibernate+0x22d/0x3a6 state_store+0x99/0xa0 kobj_attr_store+0x37/0x50 sysfs_kf_write+0x87/0xa0 kernfs_fop_write+0x1a5/0x240 __vfs_write+0xd2/0x410 vfs_write+0x101/0x250 ksys_write+0xab/0x120 __x64_sys_write+0x43/0x50 do_syscall_64+0x71/0x220 entry_SYSCALL_64_after_hwframe+0x49/0xbe
Fixes: 164a08cee135 ("ACPICA: Dispatcher: Introduce timeout mechanism for infinite loop detection") Reported-by: Fengguang Wu fengguang.wu@intel.com References: https://lists.01.org/pipermail/lkp/2018-April/008406.html Cc: Rafael J. Wysocki rjw@rjwysocki.net Cc: Thomas Gleixner tglx@linutronix.de Cc: Len Brown lenb@kernel.org Cc: Yu Chen yu.c.chen@intel.com Cc: Fengguang Wu fengguang.wu@intel.com Cc: linux-acpi@vger.kernel.org Cc: stable@vger.kernel.org Signed-off-by: Bart Van Assche bvanassche@acm.org --- drivers/acpi/osl.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index 8df9abfa947b..ed73f6fb0779 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -617,15 +617,18 @@ void acpi_os_stall(u32 us) }
/* - * Support ACPI 3.0 AML Timer operand - * Returns 64-bit free-running, monotonically increasing timer - * with 100ns granularity + * Support ACPI 3.0 AML Timer operand. Returns a 64-bit free-running, + * monotonically increasing timer with 100ns granularity. Do not use + * ktime_get() to implement this function because this function may get + * called after timekeeping has been suspended. Note: calling this function + * after timekeeping has been suspended may lead to unexpected results + * because when timekeeping is suspended the jiffies counter is not + * incremented. See also timekeeping_suspend(). */ u64 acpi_os_get_timer(void) { - u64 time_ns = ktime_to_ns(ktime_get()); - do_div(time_ns, 100); - return time_ns; + return (get_jiffies_64() - INITIAL_JIFFIES) * + (ACPI_100NSEC_PER_SEC / HZ); }
acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)