tree 8877331f815a1e08dde63e6f91b19ca3cfc29381
parent b6809ee573cc2f8de97f7c8f45eacc5db1129060
author Joerg Roedel <jroedel@suse.de> 1456786187 +0100
committer Joerg Roedel <jroedel@suse.de> 1456786516 +0100

iommu/vt-d: Use BUS_NOTIFY_REMOVED_DEVICE in hotplug path

In the PCI hotplug path of the Intel IOMMU driver, replace
the usage of the BUS_NOTIFY_DEL_DEVICE notifier, which is
executed before the driver is unbound from the device, with
BUS_NOTIFY_REMOVED_DEVICE, which runs after that.

This fixes a kernel BUG being triggered in the VT-d code
when the device driver tries to unmap DMA buffers and the
VT-d driver already destroyed all mappings.

Reported-by: Stefani Seibold <stefani@seibold.net>
Cc: stable@vger.kernel.org # v4.3+
Signed-off-by: Joerg Roedel <jroedel@suse.de>