[PATCH] x86_64: fix die_lock nesting

I noticed this when poking around in this area.

The oops_begin() function in x86_64 would only conditionally claim
the die_lock if the call is nested, but oops_end() would always
release the spinlock. This patch adds a nest count for the die lock
so that the release of the lock is only done on the final oops_end().

Signed-off-by: Corey Minyard <minyard@acm.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 9 insertions, 1 deletions

diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index 2700b1375c1f..0ebb281aa178 100644
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -385,6 +385,7 @@ void out_of_line_bug(void)
 
 static DEFINE_SPINLOCK(die_lock);
 static int die_owner = -1;
+static unsigned int die_nest_count;
 
 unsigned __kprobes long oops_begin(void)
 {
@@ -399,6 +400,7 @@ unsigned __kprobes long oops_begin(void)
                 else
                         spin_lock(&die_lock);
         }
+        die_nest_count++;
         die_owner = cpu;
         console_verbose();
         bust_spinlocks(1);
@@ -409,7 +411,13 @@ void __kprobes oops_end(unsigned long flags)
 { 
         die_owner = -1;
         bust_spinlocks(0);
-        spin_unlock_irqrestore(&die_lock, flags);
+        die_nest_count--;
+        if (die_nest_count)
+                /* We still own the lock */
+                local_irq_restore(flags);
+        else
+                /* Nest count reaches zero, release the lock. */
+                spin_unlock_irqrestore(&die_lock, flags);
         if (panic_on_oops)
                 panic("Oops");
 }