Date: Thu, 21 May 2015 05:00:03 +0000 (GMT)
From: Maninder Singh <maninder1.s@samsung.com>
Subject: [EDT][PATCH] kernel/exit.c : Fix missing read_unlock
To: akpm@linux-foundation.org, oleg@redhat.com, mhocko@suse.cz,
        peterz@infradead.org, mingo@kernel.org, riel@redhat.com,
        ionut.m.alexa@gmail.com, peter@hurleysoftware.com,
        linux-kernel@vger.kernel.org,
        "v.narang@samsung.com" <v.narang@samsung.com>,
        AKHILESH KUMAR <akhilesh.k@samsung.com>
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 EP-F6AA0618C49C4AEDA73BFF1B39950BAB
Hi,

From: Maninder Singh <maninder1.s@samsung.com>

Subject: [PATCH 1/1] kernel/exit.c : Fix missing task_unlock

This patch adds missing read_unlock if do_wait_thread or ptrace_do_wait 
returns non zero.

Signed-off-by: Maninder Singh <maninder1.s@samsung.com>
Signed-off-by: Vaneet Narang <v.narang@samsung.com>
Reviewd-by: Akhilesh Kumar <akhilesh.k@samsung.com>
---
 kernel/exit.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/kernel/exit.c b/kernel/exit.c
index 22fcc05..31a061f 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1486,12 +1486,16 @@ repeat:
 	tsk = current;
 	do {
 		retval = do_wait_thread(wo, tsk);
-		if (retval)
+		if (retval) {
+			read_unlock(&tasklist_lock);
 			goto end;
+		}
 
 		retval = ptrace_do_wait(wo, tsk);
-		if (retval)
+		if (retval) {
+			read_unlock(&tasklist_lock);
 			goto end;
+		}
 
 		if (wo->wo_flags & __WNOTHREAD)
 			break;
-- 
1.7.1

Thanks 
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