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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 <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2019-04-07 13:58:44 -04:00 • committed by Anna Schumaker
parent 085b775580
commit ae67bd3821
7 changed files with 40 additions and 26 deletions
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4
fs/nfsd/nfs4callback.c
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@ -1032,7 +1032,7 @@ static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback
* the submission code will error out, so we don't need to
* handle that case here.
*/
if (task->tk_flags & RPC_TASK_KILLED)
if (RPC_SIGNALLED(task))
goto need_restart;
return true;
@ -1081,7 +1081,7 @@ static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback
dprintk("%s: freed slot, new seqid=%d\n", __func__,
clp->cl_cb_session->se_cb_seq_nr);
if (task->tk_flags & RPC_TASK_KILLED)
if (RPC_SIGNALLED(task))
goto need_restart;
out:
return ret;