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xprtrdma: Improve locking around rpcrdma_rep creation 

Defensive clean up: Protect the rb_all_reps list during rep
creation.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Chuck Lever 2021-04-19 14:02:35 -04:00 committed by Trond Myklebust
parent 8b5292be68
commit 9e3ca33b62
1 changed files with 5 additions and 4 deletions
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9
net/sunrpc/xprtrdma/verbs.c
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@ -963,13 +963,11 @@ static void rpcrdma_reqs_reset(struct rpcrdma_xprt *r_xprt)
rpcrdma_req_reset(req);
}
/* No locking needed here. This function is called only by the
* Receive completion handler.
*/
static noinline
struct rpcrdma_rep *rpcrdma_rep_create(struct rpcrdma_xprt *r_xprt,
bool temp)
{
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
struct rpcrdma_rep *rep;
rep = kzalloc(sizeof(*rep), GFP_KERNEL);
@ -996,7 +994,10 @@ struct rpcrdma_rep *rpcrdma_rep_create(struct rpcrdma_xprt *r_xprt,
rep->rr_recv_wr.sg_list = &rep->rr_rdmabuf->rg_iov;
rep->rr_recv_wr.num_sge = 1;
rep->rr_temp = temp;
list_add(&rep->rr_all, &r_xprt->rx_buf.rb_all_reps);
spin_lock(&buf->rb_lock);
list_add(&rep->rr_all, &buf->rb_all_reps);
spin_unlock(&buf->rb_lock);
return rep;
out_free_regbuf: