On 8/12/19 2:52 PM, Santosh Sivaraj wrote:
> schedule_work() cannot be called from MCE exception context as MCE can
> interrupt even in interrupt disabled context.
>
> fixes: 733e4a4c ("powerpc/mce: hookup memory_failure for UE errors")
> Suggested-by: Mahesh Salgaonkar <mahesh@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Santosh Sivaraj <santosh@xxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx # v4.15+
> ---
> arch/powerpc/kernel/mce.c | 11 ++++++++++-
> 1 file changed, 10 insertions(+), 1 deletion(-)
Reviewed-by: Mahesh Salgaonkar <mahesh@xxxxxxxxxxxxxxxxxx>
Thanks,
-Mahesh.
>
> diff --git a/arch/powerpc/kernel/mce.c b/arch/powerpc/kernel/mce.c
> index b18df633eae9..cff31d4a501f 100644
> --- a/arch/powerpc/kernel/mce.c
> +++ b/arch/powerpc/kernel/mce.c
> @@ -33,6 +33,7 @@ static DEFINE_PER_CPU(struct machine_check_event[MAX_MC_EVT],
> 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_work = {
> .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 machine_check_event *evt)
> 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);
> }
>
> /*
>
