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blk-iolatency: fix child_lat lock irq state #915

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blk-iolatency: fix child_lat lock irq state #915

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6 changes: 4 additions & 2 deletions block/blk-iolatency.c
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Original file line number Diff line number Diff line change
Expand Up @@ -811,16 +811,18 @@ static void iolatency_clear_scaling(struct blkcg_gq *blkg)
if (blkg->parent) {
struct iolatency_grp *iolat = blkg_to_lat(blkg->parent);
struct child_latency_info *lat_info;
unsigned long flags;

if (!iolat)
return;

lat_info = &iolat->child_lat;
spin_lock(&lat_info->lock);
spin_lock_irqsave(&lat_info->lock, flags);
atomic_set(&lat_info->scale_cookie, DEFAULT_SCALE_COOKIE);
lat_info->last_scale_event = 0;
lat_info->scale_grp = NULL;
lat_info->scale_lat = 0;
spin_unlock(&lat_info->lock);
spin_unlock_irqrestore(&lat_info->lock, flags);
}
}

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