Commit e7f9fa54 authored Aug 05, 2014 by Joerg Roedel

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



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>

parent 7d1311b9

drivers/iommu/intel-iommu.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -3869,6 +3869,14 @@ static int device_notifier(struct notifier_block *nb,
		action != BUS_NOTIFY_DEL_DEVICE)
		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);
		if (!domain)
		return 0;