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authorTrond Myklebust <trond.myklebust@primarydata.com>2015-07-22 23:31:17 +0300
committerTrond Myklebust <trond.myklebust@primarydata.com>2015-07-22 23:33:59 +0300
commit68514471ceceac63c7fa9ad684d882f41be5b2d8 (patch)
treef902c3a0227db1e0c0563b9eeae57a2ae19c75a6 /net/sunrpc/backchannel_rqst.c
parentfaa4a54f0be15b5d81b574fb5a40db24345d1a6c (diff)
downloadlinux-68514471ceceac63c7fa9ad684d882f41be5b2d8.tar.xz
SUNRPC: Fix a backchannel deadlock
xprt_alloc_bc_request() cannot call xprt_free_bc_request() without deadlocking, since it already holds the xprt->bc_pa_lock. Reported-by: Chuck Lever <chuck.lever@oracle.com> Fixes: 0d2a970d0ae55 ("SUNRPC: Fix a backchannel race") Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'net/sunrpc/backchannel_rqst.c')
-rw-r--r--net/sunrpc/backchannel_rqst.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/sunrpc/backchannel_rqst.c b/net/sunrpc/backchannel_rqst.c
index 9825ff0f91d6..5a3b50aec397 100644
--- a/net/sunrpc/backchannel_rqst.c
+++ b/net/sunrpc/backchannel_rqst.c
@@ -240,8 +240,8 @@ static struct rpc_rqst *xprt_alloc_bc_request(struct rpc_xprt *xprt, __be32 xid)
req = xprt_alloc_bc_req(xprt, GFP_ATOMIC);
if (!req)
goto not_found;
- /* Note: this 'free' request adds it to xprt->bc_pa_list */
- xprt_free_bc_request(req);
+ list_add_tail(&req->rq_bc_pa_list, &xprt->bc_pa_list);
+ xprt->bc_alloc_count++;
}
req = list_first_entry(&xprt->bc_pa_list, struct rpc_rqst,
rq_bc_pa_list);