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sched/deadline: No need to check p if dl_se is valid

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Dan Carpenter reported new 'Smatch' warnings:

  > tree:   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched/core
  > head:   130816ce4d
  > commit: 1baca4ce16 [17/50] sched/deadline: Add SCHED_DEADLINE SMP-related data structures & logic
  >
  > kernel/sched/deadline.c:937 pick_next_task_dl() warn: variable dereferenced before check 'p' (see line 934)

BUG_ON() already fires if pick_next_dl_entity() doesn't return a valid
dl_se. No need to check if p is valid afterward.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Juri Lelli <juri.lelli@gmail.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Fixes: 1baca4ce16 ("sched/deadline: Add SCHED_DEADLINE SMP-related data structures & logic")
Link: http://lkml.kernel.org/r/52D54E25.6060100@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Juri Lelli
2014-01-14 12:03:51 +01:00
committed by Ingo Molnar
parent d8bf52311e
commit 71362650b5
1 changed files with 1 additions and 2 deletions
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kernel/sched/deadline.c
+1 -2
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@@ -1007,8 +1007,7 @@ struct task_struct *pick_next_task_dl(struct rq *rq)
p->se.exec_start = rq_clock_task(rq);
/* Running task will never be pushed. */
if (p)
dequeue_pushable_dl_task(rq, p);
dequeue_pushable_dl_task(rq, p);
#ifdef CONFIG_SCHED_HRTICK
if (hrtick_enabled(rq))