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SUNRPC: Fix up task signalling

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The RPC_TASK_KILLED flag should really not be set from another context
because it can clobber data in the struct task when task->tk_flags is
changed non-atomically.
Let's therefore swap out RPC_TASK_KILLED with an atomic flag, and add
a function to set that flag and safely wake up the task.

Signed-off-by: Trond Myklebust <[email protected]>
Signed-off-by: Anna Schumaker <[email protected]>
This commit is contained in:
Trond Myklebust 2019-04-07 13:58:44 -04:00 • committed by Anna Schumaker
commit ae67bd3821
7 changed files with 40 additions and 26 deletions
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4
fs/lockd/clntproc.c
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@ -715,7 +715,7 @@ static void nlmclnt_unlock_callback(struct rpc_task *task, void *data)
struct nlm_rqst *req = data;
u32 status = ntohl(req->a_res.status);
if (RPC_ASSASSINATED(task))
if (RPC_SIGNALLED(task))
goto die;
if (task->tk_status < 0) {
@ -783,7 +783,7 @@ static void nlmclnt_cancel_callback(struct rpc_task *task, void *data)
struct nlm_rqst *req = data;
u32 status = ntohl(req->a_res.status);
if (RPC_ASSASSINATED(task))
if (RPC_SIGNALLED(task))
goto die;
if (task->tk_status < 0) {