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authorTrond Myklebust <trondmy@gmail.com>2019-10-17 09:02:19 -0400
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2019-10-30 12:04:35 -0400
commit875f0706accd6501c3209bb99df8573171fb5d75 (patch)
treee24cf1a2f3194e97452a8a8907ffbfd8e543cb0c /net/sunrpc
parent9e5eefba3d098d66defa1ce59a34a41a96f49771 (diff)
SUNRPC: The TCP back channel mustn't disappear while requests are outstanding
If there are TCP back channel requests being processed by the server threads, then we should hold a reference to the transport to ensure it doesn't get freed from underneath us. Reported-by: Neil Brown <neilb@suse.de> Fixes: 2ea24497a1b3 ("SUNRPC: RPC callbacks may be split across several..") Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/backchannel_rqst.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/net/sunrpc/backchannel_rqst.c b/net/sunrpc/backchannel_rqst.c
index 339e8c077c2d..7eb251372f94 100644
--- a/net/sunrpc/backchannel_rqst.c
+++ b/net/sunrpc/backchannel_rqst.c
@@ -307,8 +307,8 @@ void xprt_free_bc_rqst(struct rpc_rqst *req)
*/
dprintk("RPC: Last session removed req=%p\n", req);
xprt_free_allocation(req);
- return;
}
+ xprt_put(xprt);
}
/*
@@ -339,7 +339,7 @@ found:
spin_unlock(&xprt->bc_pa_lock);
if (new) {
if (req != new)
- xprt_free_bc_rqst(new);
+ xprt_free_allocation(new);
break;
} else if (req)
break;
@@ -368,6 +368,7 @@ void xprt_complete_bc_request(struct rpc_rqst *req, uint32_t copied)
set_bit(RPC_BC_PA_IN_USE, &req->rq_bc_pa_state);
dprintk("RPC: add callback request to list\n");
+ xprt_get(xprt);
spin_lock(&bc_serv->sv_cb_lock);
list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
wake_up(&bc_serv->sv_cb_waitq);