From: Akinobu Mita <akinobu.mita@gmail.com>
Date: Fri, 3 Jul 2009 16:33:09 +0000 (+0900)
Subject: MIPS: Drop mmap_sem in pagefault oom path
X-Git-Tag: v2.6.31-rc6~64^2~29
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=a887b4dada2f23b2ff2aa725e0509c92dc652597;p=linux.git

MIPS: Drop mmap_sem in pagefault oom path

Fix the pagefault oom path which does not drop mm->mmap_sem.
This was introduced by commit c7c1e3846bac1e4b8a8941f6a194812e28b0a519

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---

diff --git a/arch/mips/mm/fault.c b/arch/mips/mm/fault.c
index 6751ce9ede9e..f956ecbb8136 100644
--- a/arch/mips/mm/fault.c
+++ b/arch/mips/mm/fault.c
@@ -171,6 +171,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
 	 * We ran out of memory, call the OOM killer, and return the userspace
 	 * (which will retry the fault, or kill us if we got oom-killed).
 	 */
+	up_read(&mm->mmap_sem);
 	pagefault_out_of_memory();
 	return;