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iommu/vt-d: Defer domain removal if device is assigned to a driver

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When the BUS_NOTIFY_DEL_DEVICE event is received the device
might still be attached to a driver. In this case the domain
can't be released as the mappings might still be in use.

Defer the domain removal in this case until we receivce the
BUS_NOTIFY_UNBOUND_DRIVER event.

Cc: Jiang Liu <jiang.liu@linux.intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: stable@vger.kernel.org   # v3.15, v3.16
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2014-08-05 12:55:45 +02:00
parent 7d1311b93e
commit e7f9fa5498
1 changed files with 8 additions and 0 deletions
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8
drivers/iommu/intel-iommu.c
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@ -3869,6 +3869,14 @@ static int device_notifier(struct notifier_block *nb,
action != BUS_NOTIFY_DEL_DEVICE) action != BUS_NOTIFY_DEL_DEVICE)
return 0; return 0;
/*
* If the device is still attached to a device driver we can't
* tear down the domain yet as DMA mappings may still be in use.
* Wait for the BUS_NOTIFY_UNBOUND_DRIVER event to do that.
*/
if (action == BUS_NOTIFY_DEL_DEVICE && dev->driver != NULL)
return 0;
domain = find_domain(dev); domain = find_domain(dev);
if (!domain) if (!domain)
return 0; return 0;