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| author | Khalid Aziz <khalid.aziz@oracle.com> | 2013-11-27 22:19:25 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-12-20 15:48:54 (GMT) |
| commit | 2ab0ff9b179aadf1f30f2dfa9db2b9404324e135 (patch) | |
| tree | 0611a3e844b9deff456d3637e2f95c68f613d932 /kernel/module_signing.c | |
| parent | 755ca0109f973f23fced94f8dcd8c60e013f270a (diff) | |
| download | linux-fsl-qoriq-2ab0ff9b179aadf1f30f2dfa9db2b9404324e135.tar.xz | |
PCI: Disable Bus Master only on kexec reboot
commit 4fc9bbf98fd66f879e628d8537ba7c240be2b58e upstream.
Add a flag to tell the PCI subsystem that kernel is shutting down in
preparation to kexec a kernel. Add code in PCI subsystem to use this flag
to clear Bus Master bit on PCI devices only in case of kexec reboot.
This fixes a power-off problem on Acer Aspire V5-573G and likely other
machines and avoids any other issues caused by clearing Bus Master bit on
PCI devices in normal shutdown path. The problem was introduced by
b566a22c2332 ("PCI: disable Bus Master on PCI device shutdown").
This patch is based on discussion at
http://marc.info/?l=linux-pci&m=138425645204355&w=2
Link: https://bugzilla.kernel.org/show_bug.cgi?id=63861
Reported-by: Chang Liu <cl91tp@gmail.com>
Signed-off-by: Khalid Aziz <khalid.aziz@oracle.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Konstantin Khlebnikov <koct9i@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/module_signing.c')
0 files changed, 0 insertions, 0 deletions