Close a race I introduced in the spinlock_* changes. We need to finish

disabling interrupts before updating the saved pil in the thread.  If we
save the value first then it can be clobbered if an interrupt comes in
and the interrupt handler tries to acquire a spin lock.

Submitted by:	marius

1 files changed, 3 insertions, 1 deletions

diff --git a/sys/sparc64/sparc64/machdep.c b/sys/sparc64/sparc64/machdep.c
index ccad878..a91f809 100644
--- a/sys/sparc64/sparc64/machdep.c
+++ b/sys/sparc64/sparc64/machdep.c
@@ -236,11 +236,13 @@ void
 spinlock_enter(void)
 {
 	struct thread *td;
+	register_t pil;
 
 	td = curthread;
 	if (td->td_md.md_spinlock_count == 0) {
-		td->td_md.md_saved_pil = rdpr(pil);
+		pil = rdpr(pil);
 		wrpr(pil, 0, 14);
+		td->td_md.md_saved_pil = pil;
 	}
 	td->td_md.md_spinlock_count++;
 	critical_enter();