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From: Julia Lawall on 26 May 2010 12:00
From: Julia Lawall <julia(a)diku.dk>

Add a read_unlock missing on the error path. Other ways of reaching
out_unlock have tasklist_lock unlocked.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression E1;
@@

* read_lock(E1,...);
<+... when != E1
if (...) {
... when != E1
* return ...;
}
...+>
* read_unlock(E1,...);
// </smpl>

Signed-off-by: Julia Lawall <julia(a)diku.dk>

---
I wasn't able to find what security_task_setscheduler actually does.
If it releases tasklist_lock in an error case, then ignire this patch.

arch/mips/kernel/mips-mt-fpaff.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/mips/kernel/mips-mt-fpaff.c b/arch/mips/kernel/mips-mt-fpaff.c
index f5981c4..73581bf 100644
--- a/arch/mips/kernel/mips-mt-fpaff.c
+++ b/arch/mips/kernel/mips-mt-fpaff.c
@@ -86,8 +86,10 @@ asmlinkage long mipsmt_sys_sched_setaffinity(pid_t pid, unsigned int len,
}

retval = security_task_setscheduler(p, 0, NULL);
- if (retval)
+ if (retval) {
+ read_unlock(&tasklist_lock);
goto out_unlock;
+ }

/* Record new user-specified CPU set for future reference */
p->thread.user_cpus_allowed = new_mask;
--
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