diff options
Diffstat (limited to 'arch/powerpc/mm/subpage-prot.c')
| -rw-r--r-- | arch/powerpc/mm/subpage-prot.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/arch/powerpc/mm/subpage-prot.c b/arch/powerpc/mm/subpage-prot.c index c9dff4e1f295..473dd430e306 100644 --- a/arch/powerpc/mm/subpage-prot.c +++ b/arch/powerpc/mm/subpage-prot.c @@ -90,16 +90,18 @@ static void hpte_flush_range(struct mm_struct *mm, unsigned long addr, static void subpage_prot_clear(unsigned long addr, unsigned long len) { struct mm_struct *mm = current->mm; - struct subpage_prot_table *spt = mm_ctx_subpage_prot(&mm->context); + struct subpage_prot_table *spt; u32 **spm, *spp; unsigned long i; size_t nw; unsigned long next, limit; + down_write(&mm->mmap_sem); + + spt = mm_ctx_subpage_prot(&mm->context); if (!spt) - return ; + goto err_out; - down_write(&mm->mmap_sem); limit = addr + len; if (limit > spt->maxaddr) limit = spt->maxaddr; @@ -127,6 +129,8 @@ static void subpage_prot_clear(unsigned long addr, unsigned long len) /* now flush any existing HPTEs for the range */ hpte_flush_range(mm, addr, nw); } + +err_out: up_write(&mm->mmap_sem); } @@ -189,7 +193,7 @@ SYSCALL_DEFINE3(subpage_prot, unsigned long, addr, unsigned long, len, u32 __user *, map) { struct mm_struct *mm = current->mm; - struct subpage_prot_table *spt = mm_ctx_subpage_prot(&mm->context); + struct subpage_prot_table *spt; u32 **spm, *spp; unsigned long i; size_t nw; @@ -219,6 +223,7 @@ SYSCALL_DEFINE3(subpage_prot, unsigned long, addr, down_write(&mm->mmap_sem); + spt = mm_ctx_subpage_prot(&mm->context); if (!spt) { /* * Allocate subpage prot table if not already done. |