From: Bernd Schmidt <bernd.schmidt@analog.com>
Date: Sun, 21 Oct 2007 14:32:27 +0000 (+0800)
Subject: Blackfin arch: Fixing Bug: balance calls to get_task_mm with corresponding mmput... 
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=c1e7399da76646f34c3857147cca649cd58745af;p=openwrt%2Fstaging%2Fblogic.git

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>
---

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);