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Merge tag 'v4.9.162' of git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable into odroidg12-4.9.y

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This is the 4.9.162 stable release
This commit is contained in:
Mauro (mdrjr) Ribeiro
2020-04-07 14:56:11 -03:00
parent a210829d46 f422a02f86
commit 5be05e092c
28 changed files with 138 additions and 105 deletions
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11
kernel/locking/rwsem-xadd.c
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@@ -195,15 +195,22 @@ static void __rwsem_mark_wake(struct rw_semaphore *sem,
woken++;
tsk = waiter->task;
wake_q_add(wake_q, tsk);
get_task_struct(tsk);
list_del(&waiter->list);
/*
* Ensure that the last operation is setting the reader
* Ensure calling get_task_struct() before setting the reader
* waiter to nil such that rwsem_down_read_failed() cannot
* race with do_exit() by always holding a reference count
* to the task to wakeup.
*/
smp_store_release(&waiter->task, NULL);
/*
* Ensure issuing the wakeup (either by us or someone else)
* after setting the reader waiter to nil.
*/
wake_q_add(wake_q, tsk);
/* wake_q_add() already take the task ref */
put_task_struct(tsk);
}
adjustment = woken * RWSEM_ACTIVE_READ_BIAS - adjustment;