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xen/events: fix delayed eoi list handling

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When delaying eoi handling of events, the related elements are queued
into the percpu lateeoi list. In case the list isn't empty, the
elements should be sorted by the time when eoi handling is to happen.

Unfortunately a new element will never be queued at the start of the
list, even if it has a handling time lower than all other list
elements.

Fix that by handling that case the same way as for an empty list.

Fixes: e99502f762 ("xen/events: defer eoi in case of excessive number of events")
Reported-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Juergen Gross 2023-09-25 17:54:13 +02:00
parent 50e865a568
commit 47d9702040
1 changed files with 3 additions and 1 deletions
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4
drivers/xen/events/events_base.c
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@ -604,7 +604,9 @@ static void lateeoi_list_add(struct irq_info *info)
spin_lock_irqsave(&eoi->eoi_list_lock, flags);
if (list_empty(&eoi->eoi_list)) {
elem = list_first_entry_or_null(&eoi->eoi_list, struct irq_info,
eoi_list);
if (!elem || info->eoi_time < elem->eoi_time) {
list_add(&info->eoi_list, &eoi->eoi_list);
mod_delayed_work_on(info->eoi_cpu, system_wq,
&eoi->delayed, delay);