From: Santosh Sivaraj <santosh@xxxxxxxxxx> commit b5bda6263cad9a927e1a4edb7493d542da0c1410 upstream. schedule_work() cannot be called from MCE exception context as MCE can interrupt even in interrupt disabled context. Fixes: 733e4a4c4467 ("powerpc/mce: hookup memory_failure for UE errors") Cc: stable@xxxxxxxxxxxxxxx # v4.15+ Reviewed-by: Mahesh Salgaonkar <mahesh@xxxxxxxxxxxxxxxxxx> Reviewed-by: Nicholas Piggin <npiggin@xxxxxxxxx> Acked-by: Balbir Singh <bsingharora@xxxxxxxxx> Signed-off-by: Santosh Sivaraj <santosh@xxxxxxxxxx> Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20190820081352.8641-2-santosh@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/powerpc/kernel/mce.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) --- a/arch/powerpc/kernel/mce.c +++ b/arch/powerpc/kernel/mce.c @@ -33,6 +33,7 @@ static DEFINE_PER_CPU(struct machine_che mce_ue_event_queue); static void machine_check_process_queued_event(struct irq_work *work); +static void machine_check_ue_irq_work(struct irq_work *work); void machine_check_ue_event(struct machine_check_event *evt); static void machine_process_ue_event(struct work_struct *work); @@ -40,6 +41,10 @@ static struct irq_work mce_event_process .func = machine_check_process_queued_event, }; +static struct irq_work mce_ue_event_irq_work = { + .func = machine_check_ue_irq_work, +}; + DECLARE_WORK(mce_ue_event_work, machine_process_ue_event); static void mce_set_error_info(struct machine_check_event *mce, @@ -199,6 +204,10 @@ void release_mce_event(void) get_mce_event(NULL, true); } +static void machine_check_ue_irq_work(struct irq_work *work) +{ + schedule_work(&mce_ue_event_work); +} /* * Queue up the MCE event which then can be handled later. @@ -216,7 +225,7 @@ void machine_check_ue_event(struct machi memcpy(this_cpu_ptr(&mce_ue_event_queue[index]), evt, sizeof(*evt)); /* Queue work to process this event later. */ - schedule_work(&mce_ue_event_work); + irq_work_queue(&mce_ue_event_irq_work); } /*