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powerpc/powernv: Fix opal-elog interrupt handler 

The conversion of opal events to a proper irqchip means that handlers
are called until the relevant opal event has been cleared by
processing it. Events that queue work should therefore use a threaded
handler to mask the event until processing is complete.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Tested-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
hifive-unleashed-5.1
Alistair Popple 2015-07-03 17:39:12 +10:00 committed by Michael Ellerman
parent aaf6fd5c75
commit a8956a7b72
1 changed files with 5 additions and 11 deletions
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16
arch/powerpc/platforms/powernv/opal-elog.c
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@ -237,7 +237,7 @@ static struct elog_obj *create_elog_obj(uint64_t id, size_t size, uint64_t type)
return elog;
}
static void elog_work_fn(struct work_struct *work)
static irqreturn_t elog_event(int irq, void *data)
{
__be64 size;
__be64 id;
@ -251,7 +251,7 @@ static void elog_work_fn(struct work_struct *work)
rc = opal_get_elog_size(&id, &size, &type);
if (rc != OPAL_SUCCESS) {
pr_err("ELOG: OPAL log info read failed\n");
return;
return IRQ_HANDLED;
}
elog_size = be64_to_cpu(size);
@ -270,16 +270,10 @@ static void elog_work_fn(struct work_struct *work)
* entries.
*/
if (kset_find_obj(elog_kset, name))
return;
return IRQ_HANDLED;
create_elog_obj(log_id, elog_size, elog_type);
}
static DECLARE_WORK(elog_work, elog_work_fn);
static irqreturn_t elog_event(int irq, void *data)
{
schedule_work(&elog_work);
return IRQ_HANDLED;
}
@ -304,8 +298,8 @@ int __init opal_elog_init(void)
return irq;
}
rc = request_irq(irq, elog_event,
IRQ_TYPE_LEVEL_HIGH, "opal-elog", NULL);
rc = request_threaded_irq(irq, NULL, elog_event,
IRQF_TRIGGER_HIGH | IRQF_ONESHOT, "opal-elog", NULL);
if (rc) {
pr_err("%s: Can't request OPAL event irq (%d)\n",
__func__, rc);