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SUNRPC: Don't start a timer on an already queued rpc task 

Move the test for whether a task is already queued to prevent
corruption of the timer list in __rpc_sleep_on_priority_timeout().

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2020-04-04 19:52:21 -04:00
parent 44ea8dfce0
commit 1fab7dc477
1 changed files with 13 additions and 6 deletions
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19
net/sunrpc/sched.c
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@ -204,10 +204,6 @@ static void __rpc_add_wait_queue(struct rpc_wait_queue *queue,
struct rpc_task *task,
unsigned char queue_priority)
{
WARN_ON_ONCE(RPC_IS_QUEUED(task));
if (RPC_IS_QUEUED(task))
return;
INIT_LIST_HEAD(&task->u.tk_wait.timer_list);
if (RPC_IS_PRIORITY(queue))
__rpc_add_wait_queue_priority(queue, task, queue_priority);
@ -382,7 +378,7 @@ static void rpc_make_runnable(struct workqueue_struct *wq,
* NB: An RPC task will only receive interrupt-driven events as long
* as it's on a wait queue.
*/
static void __rpc_sleep_on_priority(struct rpc_wait_queue *q,
static void __rpc_do_sleep_on_priority(struct rpc_wait_queue *q,
struct rpc_task *task,
unsigned char queue_priority)
{
@ -395,12 +391,23 @@ static void __rpc_sleep_on_priority(struct rpc_wait_queue *q,
}
static void __rpc_sleep_on_priority(struct rpc_wait_queue *q,
struct rpc_task *task,
unsigned char queue_priority)
{
if (WARN_ON_ONCE(RPC_IS_QUEUED(task)))
return;
__rpc_do_sleep_on_priority(q, task, queue_priority);
}
static void __rpc_sleep_on_priority_timeout(struct rpc_wait_queue *q,
struct rpc_task *task, unsigned long timeout,
unsigned char queue_priority)
{
if (WARN_ON_ONCE(RPC_IS_QUEUED(task)))
return;
if (time_is_after_jiffies(timeout)) {
__rpc_sleep_on_priority(q, task, queue_priority);
__rpc_do_sleep_on_priority(q, task, queue_priority);
__rpc_add_timer(q, task, timeout);
} else
task->tk_status = -ETIMEDOUT;