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| author | Liu Shuo <shuo.a.liu@intel.com> | 2017-07-29 18:59:57 +0200 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2017-08-11 16:46:01 +0200 |
| commit | 020db9d3c1dc0aab9ab1252f4a36b6d8456b8794 (patch) | |
| tree | 65e78315c54d92e53bf27dc55a273ff17fd2b21e /drivers/xen | |
| parent | xen: avoid deadlock in xenbus (diff) | |
| download | linux-020db9d3c1dc0aab9ab1252f4a36b6d8456b8794.tar.xz linux-020db9d3c1dc0aab9ab1252f4a36b6d8456b8794.zip | |
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>
Diffstat (limited to 'drivers/xen')
| -rw-r--r-- | drivers/xen/events/events_base.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c index bae1f5d36c26..2d43118077e4 100644 --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -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) |