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xen/events: Fix interrupt lost during irq_disable and irq_enable 

Here is a device has xen-pirq-MSI interrupt. Dom0 might lost interrupt
during driver irq_disable/irq_enable. Here is the scenario,
 1. irq_disable -> disable_dynirq -> mask_evtchn(irq channel)
 2. dev interrupt raised by HW and Xen mark its evtchn as pending
 3. irq_enable -> startup_pirq -> eoi_pirq ->
    clear_evtchn(channel of irq) -> clear pending status
 4. consume_one_event process the irq event without pending bit assert
    which result in interrupt lost once
 5. No HW interrupt raising anymore.

Now use enable_dynirq for enable_pirq of xen_pirq_chip to remove
eoi_pirq when irq_enable.

Signed-off-by: Liu Shuo <shuo.a.liu@intel.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Liu Shuo 2017-07-30 00:59:57 +08:00 committed by Juergen Gross
parent 529871bb3c
commit 020db9d3c1
1 changed files with 1 additions and 1 deletions
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2
drivers/xen/events/events_base.c
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@ -574,7 +574,7 @@ static void shutdown_pirq(struct irq_data *data)
static void enable_pirq(struct irq_data *data)
{
startup_pirq(data);
enable_dynirq(data);
}
static void disable_pirq(struct irq_data *data)