There is the log:
[ 27.758391] xhci_hcd 0000:00:14.0: shutdown start
[ 27.768329] xhci_hcd 0000:00:14.0: shutdown stop
[ 27.773532] pci 0000:00:0b.0: shutdown start
[ 27.778335] pci 0000:00:0b.0: shutdown stop
[ 27.783041] pci 0000:00:0a.0: shutdown start
[ 27.787847] pci 0000:00:0a.0: shutdown stop
[ 27.792550] pci 0000:00:03.0: shutdown start
[ 27.797362] pci 0000:00:03.0: shutdown stop
[ 27.802087] i915 0000:00:02.0: shutdown start
[ 27.816006] i915 0000:00:02.0: shutdown stop
[ 27.832384] PM: Calling mce_syscore_shutdown+0x0/0x50 start
[ 27.838651] PM: Calling mce_syscore_shutdown+0x0/0x50 stop
[ 27.844813] PM: Calling i8259A_shutdown+0x0/0x20 start
It seems has a potential race on i8259A_shutdown().
Signed-off-by: Figo <tianfei.zh...@intel.com>
---
arch/x86/kernel/i8259.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/x86/kernel/i8259.c b/arch/x86/kernel/i8259.c
index 16cb827..06906d4 100644
--- a/arch/x86/kernel/i8259.c
+++ b/arch/x86/kernel/i8259.c
@@ -257,12 +257,16 @@ static int i8259A_suspend(void)
static void i8259A_shutdown(void)
{
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&i8259A_lock, flags);
/* Put the i8259A into a quiescent state that
* the kernel initialization code can get it
* out of.
*/
outb(0xff, PIC_MASTER_IMR); /* mask all of 8259A-1 */
outb(0xff, PIC_SLAVE_IMR); /* mask all of 8259A-2 */
+ raw_spin_unlock_irqrestore(&i8259A_lock, flags);
}
static struct syscore_ops i8259_syscore_ops = {
--
1.7.9.5
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