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Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull irq fixes from Ingo Molnar:
 "A sparse irq race/locking fix, and a MSI irq domains population fix"

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  genirq: Make sparse_irq_lock protect what it should protect
  genirq/msi: Fix populating multiple interrupts
This commit is contained in:
Linus Torvalds 2017-09-12 11:25:56 -07:00
commit 33f82bda01
2 changed files with 10 additions and 19 deletions
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24
kernel/irq/irqdesc.c
View file

@ -421,10 +421,8 @@ static void free_desc(unsigned int irq)
* The sysfs entry must be serialized against a concurrent
* irq_sysfs_init() as well.
*/
mutex_lock(&sparse_irq_lock);
kobject_del(&desc->kobj);
delete_irq_desc(irq);
mutex_unlock(&sparse_irq_lock);
/*
* We free the descriptor, masks and stat fields via RCU. That
@ -462,20 +460,15 @@ static int alloc_descs(unsigned int start, unsigned int cnt, int node,
desc = alloc_desc(start + i, node, flags, mask, owner);
if (!desc)
goto err;
mutex_lock(&sparse_irq_lock);
irq_insert_desc(start + i, desc);
irq_sysfs_add(start + i, desc);
mutex_unlock(&sparse_irq_lock);
}
bitmap_set(allocated_irqs, start, cnt);
return start;
err:
for (i--; i >= 0; i--)
free_desc(start + i);
mutex_lock(&sparse_irq_lock);
bitmap_clear(allocated_irqs, start, cnt);
mutex_unlock(&sparse_irq_lock);
return -ENOMEM;
}
@ -575,6 +568,7 @@ static inline int alloc_descs(unsigned int start, unsigned int cnt, int node,
desc->owner = owner;
}
bitmap_set(allocated_irqs, start, cnt);
return start;
}
@ -670,10 +664,10 @@ void irq_free_descs(unsigned int from, unsigned int cnt)
if (from >= nr_irqs || (from + cnt) > nr_irqs)
return;
mutex_lock(&sparse_irq_lock);
for (i = 0; i < cnt; i++)
free_desc(from + i);
mutex_lock(&sparse_irq_lock);
bitmap_clear(allocated_irqs, from, cnt);
mutex_unlock(&sparse_irq_lock);
}
@ -720,19 +714,15 @@ __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,
from, cnt, 0);
ret = -EEXIST;
if (irq >=0 && start != irq)
goto err;
goto unlock;
if (start + cnt > nr_irqs) {
ret = irq_expand_nr_irqs(start + cnt);
if (ret)
goto err;
goto unlock;
}
bitmap_set(allocated_irqs, start, cnt);
mutex_unlock(&sparse_irq_lock);
return alloc_descs(start, cnt, node, affinity, owner);
err:
ret = alloc_descs(start, cnt, node, affinity, owner);
unlock:
mutex_unlock(&sparse_irq_lock);
return ret;
}

5
kernel/irq/msi.c
View file

@ -315,11 +315,12 @@ int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
ops->set_desc(arg, desc);
/* Assumes the domain mutex is held! */
ret = irq_domain_alloc_irqs_hierarchy(domain, virq, 1, arg);
ret = irq_domain_alloc_irqs_hierarchy(domain, desc->irq, 1,
arg);
if (ret)
break;
irq_set_msi_desc_off(virq, 0, desc);
irq_set_msi_desc_off(desc->irq, 0, desc);
}
if (ret) {