From: Max Filippov <jcmvbkbc@gmail.com>
Date: Mon, 6 Oct 2014 17:01:17 +0000 (+0400)
Subject: xtensa: re-wire umount syscall to sys_oldumount
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=2651cc6974d47fc43bef1cd8cd26966e4f5ba306;p=openwrt%2Fstaging%2Fblogic.git

xtensa: re-wire umount syscall to sys_oldumount

Userspace actually passes single parameter (path name) to the umount
syscall, so new umount just fails. Fix it by requesting old umount
syscall implementation and re-wiring umount to it.

Cc: stable@vger.kernel.org
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
---

diff --git a/arch/xtensa/include/uapi/asm/unistd.h b/arch/xtensa/include/uapi/asm/unistd.h
index ee7b1527666b..db5bb72e2f4e 100644
--- a/arch/xtensa/include/uapi/asm/unistd.h
+++ b/arch/xtensa/include/uapi/asm/unistd.h
@@ -384,7 +384,8 @@ __SYSCALL(174, sys_chroot, 1)
 #define __NR_pivot_root 			175
 __SYSCALL(175, sys_pivot_root, 2)
 #define __NR_umount 				176
-__SYSCALL(176, sys_umount, 2)
+__SYSCALL(176, sys_oldumount, 1)
+#define __ARCH_WANT_SYS_OLDUMOUNT
 #define __NR_swapoff 				177
 __SYSCALL(177, sys_swapoff, 1)
 #define __NR_sync 				178