Commit e02a0aa2 authored by Paolo Valente's avatar Paolo Valente Committed by Jens Axboe

block, bfq: always update the budget of an entity when needed

When the next child entity to serve changes for a given parent entity,
the budget of that parent entity must be updated accordingly.
Unfortunately, this update is not performed, by mistake, for the
entities that happen to switch from having no child entity to serve,
to having one child entity to serve.
Signed-off-by: default avatarPaolo Valente <>
Signed-off-by: default avatarJens Axboe <>
parent 8a511ba5
......@@ -130,10 +130,14 @@ static bool bfq_update_next_in_service(struct bfq_sched_data *sd,
if (!change_without_lookup) /* lookup needed */
next_in_service = bfq_lookup_next_entity(sd, expiration);
if (next_in_service)
parent_sched_may_change = !sd->next_in_service ||
if (next_in_service) {
bool new_budget_triggers_change =
parent_sched_may_change = !sd->next_in_service ||
sd->next_in_service = next_in_service;
if (!next_in_service)
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