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| author |   Khalid Aziz <khalid.aziz@oracle.com> | 2013-11-27 15:19:25 -0700 |
|---|---|---|
| committer |   Bjorn Helgaas <bhelgaas@google.com> | 2013-12-07 14:20:28 -0700 |
| commit | 4fc9bbf98fd66f879e628d8537ba7c240be2b58e (patch) | |
| tree | 09cdc49f0f145f7af3380c7896fa539d4192ca1d /include/linux | |
| parent | PCI: mvebu: Return 'unsupported' for Interrupt Line and Interrupt Pin (diff) | |
| download | linux-dev-4fc9bbf98fd66f879e628d8537ba7c240be2b58e.tar.xz linux-dev-4fc9bbf98fd66f879e628d8537ba7c240be2b58e.zip | |
PCI: Disable Bus Master only on kexec reboot
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>
Cc: stable@vger.kernel.org # v3.5+
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/kexec.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/kexec.h b/include/linux/kexec.h index d78d28a733b1..5fd33dc1fe3a 100644 --- a/include/linux/kexec.h +++ b/include/linux/kexec.h @@ -198,6 +198,9 @@ extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4]; extern size_t vmcoreinfo_size; extern size_t vmcoreinfo_max_size; +/* flag to track if kexec reboot is in progress */ +extern bool kexec_in_progress; + int __init parse_crashkernel(char *cmdline, unsigned long long system_ram, unsigned long long *crash_size, unsigned long long *crash_base); int parse_crashkernel_high(char *cmdline, unsigned long long system_ram, |