[PATCH 1/3] powerpc/mm: move mmap_sem unlock up from do_sigbus

[Laurent Dufour]

Move mmap_sem releasing in the do_sigbus()'s unique caller : mm_fault_error()

No functional changes.

Signed-off-by: Laurent Dufour <lduf...@linux.vnet.ibm.com>
---
 arch/powerpc/mm/fault.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 62a50d6d1053..ee09604bbe12 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -119,8 +119,6 @@ static int do_sigbus(struct pt_regs *regs, unsigned long 
address,
        siginfo_t info;
        unsigned int lsb = 0;
 
-       up_read(&current->mm->mmap_sem);
-
        if (!user_mode(regs))
                return MM_FAULT_ERR(SIGBUS);
 
@@ -184,8 +182,10 @@ static int mm_fault_error(struct pt_regs *regs, unsigned 
long addr, int fault)
                return MM_FAULT_RETURN;
        }
 
-       if (fault & (VM_FAULT_SIGBUS|VM_FAULT_HWPOISON|VM_FAULT_HWPOISON_LARGE))
+       if (fault & 
(VM_FAULT_SIGBUS|VM_FAULT_HWPOISON|VM_FAULT_HWPOISON_LARGE)) {
+               up_read(&current->mm->mmap_sem);
                return do_sigbus(regs, addr, fault);
+       }
 
        /* We don't understand the fault code, this is fatal */
        BUG();
-- 
2.7.4