Blackfin arch: Fixing Bug: balance calls to get_task_mm with corresponding mmput calls

We must balance calls to get_task_mm with corresponding mmput calls, otherwise
refcounting is screwed up and mms don't get freed when their task exits.

Signed-off-by: Bryan Wu <bryan.wu@analog.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c
index 8823e9ade584..afd044e78af6 100644
--- a/arch/blackfin/kernel/traps.c
+++ b/arch/blackfin/kernel/traps.c
@@ -118,12 +118,14 @@ static int printk_address(unsigned long address)
                                         offset = (address - vma->vm_start) + (vma->vm_pgoff << PAGE_SHIFT);
 
                                 write_unlock_irq(&tasklist_lock);
+                                mmput(mm);
                                 return printk("<0x%p> [ %s + 0x%lx ]",
                                               (void *)address, name, offset);
                         }
 
                         vml = vml->next;
                 }
+                mmput(mm);
         }
         write_unlock_irq(&tasklist_lock);