path: root/kernel/kexec.c
diff options
authorKhalid Aziz <>2013-11-27 15:19:25 -0700
committerBjorn Helgaas <>2013-12-07 14:20:28 -0700
commit4fc9bbf98fd66f879e628d8537ba7c240be2b58e (patch)
tree09cdc49f0f145f7af3380c7896fa539d4192ca1d /kernel/kexec.c
parentf407dae76040c9529c2c83b1488dda4ffc54522c (diff)
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 Link: Reported-by: Chang Liu <> Signed-off-by: Khalid Aziz <> Signed-off-by: Bjorn Helgaas <> Acked-by: Konstantin Khlebnikov <> Cc: # v3.5+
Diffstat (limited to 'kernel/kexec.c')
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 490afc03627e..d0d8fca54065 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -47,6 +47,9 @@ u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
size_t vmcoreinfo_size;
size_t vmcoreinfo_max_size = sizeof(vmcoreinfo_data);
+/* Flag to indicate we are going to kexec a new kernel */
+bool kexec_in_progress = false;
/* Location of the reserved area for the crash kernel */
struct resource crashk_res = {
.name = "Crash kernel",
@@ -1675,6 +1678,7 @@ int kernel_kexec(void)
} else
+ kexec_in_progress = true;
printk(KERN_EMERG "Starting new kernel\n");