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iommu/amd: Flush iova queue before releasing dma_ops_domain

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Before a dma_ops_domain can be freed, we need to make sure
it is not longer referenced by the flush queue. So empty the
queue before a dma_ops_domain can be freed.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2016-07-07 16:12:02 +02:00
parent cda7005ba2
commit 281e8ccbff
1 changed files with 14 additions and 3 deletions
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17
drivers/iommu/amd_iommu.c
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@ -2154,12 +2154,10 @@ static void __queue_flush(struct flush_queue *queue)
queue->next = 0;
}
void queue_flush_timeout(unsigned long unsused)
static void queue_flush_all(void)
{
int cpu;
atomic_set(&queue_timer_on, 0);
for_each_possible_cpu(cpu) {
struct flush_queue *queue;
unsigned long flags;
@ -2172,6 +2170,12 @@ void queue_flush_timeout(unsigned long unsused)
}
}
static void queue_flush_timeout(unsigned long unsused)
{
atomic_set(&queue_timer_on, 0);
queue_flush_all();
}
static void queue_add(struct dma_ops_domain *dma_dom,
unsigned long address, unsigned long pages)
{
@ -2877,6 +2881,13 @@ static void amd_iommu_domain_free(struct iommu_domain *dom)
switch (dom->type) {
case IOMMU_DOMAIN_DMA:
/*
* First make sure the domain is no longer referenced from the
* flush queue
*/
queue_flush_all();
/* Now release the domain */
dma_dom = domain->priv;
dma_ops_domain_free(dma_dom);
break;