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| author |   Khalid Aziz <khalid.aziz@hp.com> | 2012-04-27 13:00:33 -0600 |
|---|---|---|
| committer |   Bjorn Helgaas <bhelgaas@google.com> | 2012-05-04 11:07:18 -0600 |
| commit | b566a22c23327f18ce941ffad0ca907e50a53d41 (patch) | |
| tree | ce675ff2f56a88778ea051f779868ffb9d746160 /drivers/i2c/algos/i2c-algo-bit.c | |
| parent | PCI: work around IvyBridge internal graphics FLR erratum (diff) | |
| download | wireguard-linux-b566a22c23327f18ce941ffad0ca907e50a53d41.tar.xz wireguard-linux-b566a22c23327f18ce941ffad0ca907e50a53d41.zip | |
PCI: disable Bus Master on PCI device shutdown
Disable Bus Master bit on the device in pci_device_shutdown() to ensure PCI
devices do not continue to DMA data after shutdown. This can cause memory
corruption in case of a kexec where the current kernel shuts down and
transfers control to a new kernel while a PCI device continues to DMA to
memory that does not belong to it any more in the new kernel.
I have tested this code on two laptops, two workstations and a 16-socket
server. kexec worked correctly on all of them.
Signed-off-by: Khalid Aziz <khalid.aziz@hp.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/i2c/algos/i2c-algo-bit.c')
0 files changed, 0 insertions, 0 deletions