[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 (file)
--- a/arch/sparc64/mm/tsb.c
+++ b/arch/sparc64/mm/tsb.c
@@ -373,6 +373,7 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
 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 @@ void destroy_context(struct mm_struct *mm)
        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);
 }