[SPARC64]: destroy_context() needs to disable interrupts.
get_new_mmu_context() can be invoked from interrupt context
now for the new SMP version wrap handling.
So disable interrupt while taking ctx_alloc_lock in destroy_context()
so we don't deadlock.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc64/mm/tsb.c b/arch/sparc64/mm/tsb.c
index 353cb06..534ac28 100644
--- a/arch/sparc64/mm/tsb.c
+++ b/arch/sparc64/mm/tsb.c
@@ -373,6 +373,7 @@
void destroy_context(struct mm_struct *mm)
{
unsigned long size = mm->context.tsb_nentries * sizeof(struct tsb);
+ unsigned long flags;
free_pages((unsigned long) mm->context.tsb, get_order(size));
@@ -383,12 +384,12 @@
mm->context.tsb = NULL;
mm->context.tsb_reg_val = 0UL;
- spin_lock(&ctx_alloc_lock);
+ spin_lock_irqsave(&ctx_alloc_lock, flags);
if (CTX_VALID(mm->context)) {
unsigned long nr = CTX_NRBITS(mm->context);
mmu_context_bmap[nr>>6] &= ~(1UL << (nr & 63));
}
- spin_unlock(&ctx_alloc_lock);
+ spin_unlock_irqrestore(&ctx_alloc_lock, flags);
}