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powerpc/mce: Schedule work from irq_work

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commit b5bda6263c upstream.

schedule_work() cannot be called from MCE exception context as MCE can
interrupt even in interrupt disabled context.

Fixes: 733e4a4c44 ("powerpc/mce: hookup memory_failure for UE errors")
Cc: stable@vger.kernel.org # v4.15+
Reviewed-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Santosh Sivaraj <santosh@fossix.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190820081352.8641-2-santosh@fossix.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Santosh Sivaraj 2019-08-20 13:43:46 +05:30 committed by Greg Kroah-Hartman
parent ee6eeeb88e
commit ba3ca9fcb0
1 changed files with 10 additions and 1 deletions
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11
arch/powerpc/kernel/mce.c
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@ -45,6 +45,7 @@ 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);
@ -52,6 +53,10 @@ 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,
@ -208,6 +213,10 @@ 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.
@ -225,7 +234,7 @@ 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);
}
/*