Add a few simple error checks to tlb dumper.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/lib-32/dump_tlb.c b/arch/mips/lib-32/dump_tlb.c
index 9373a77..46519f4 100644
--- a/arch/mips/lib-32/dump_tlb.c
+++ b/arch/mips/lib-32/dump_tlb.c
@@ -160,24 +160,27 @@
if (addr > KSEG0)
page_dir = pgd_offset_k(0);
- else
+ else if (t->mm) {
page_dir = pgd_offset(t->mm, 0);
- printk("page_dir == %08x\n", (unsigned int) page_dir);
+ printk("page_dir == %08x\n", (unsigned int) page_dir);
+ } else
+ printk("Current thread has no mm\n");
if (addr > KSEG0)
pgd = pgd_offset_k(addr);
- else
+ else if (t->mm) {
pgd = pgd_offset(t->mm, addr);
- printk("pgd == %08x, ", (unsigned int) pgd);
+ printk("pgd == %08x, ", (unsigned int) pgd);
+ pud = pud_offset(pgd, addr);
+ printk("pud == %08x, ", (unsigned int) pud);
- pud = pud_offset(pgd, addr);
- printk("pud == %08x, ", (unsigned int) pud);
+ pmd = pmd_offset(pud, addr);
+ printk("pmd == %08x, ", (unsigned int) pmd);
- pmd = pmd_offset(pud, addr);
- printk("pmd == %08x, ", (unsigned int) pmd);
-
- pte = pte_offset(pmd, addr);
- printk("pte == %08x, ", (unsigned int) pte);
+ pte = pte_offset(pmd, addr);
+ printk("pte == %08x, ", (unsigned int) pte);
+ } else
+ printk("Current thread has no mm\n");
page = *pte;
#ifdef CONFIG_64BIT_PHYS_ADDR
