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xprtrdma: Improve commentary around rpcrdma_reps_unmap()

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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 14:02:28 -04:00 committed by Trond Myklebust
parent eaf86e8cc8
commit 8b5292be68
1 changed files with 5 additions and 1 deletions
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6
net/sunrpc/xprtrdma/verbs.c
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@ -1041,6 +1041,10 @@ static void rpcrdma_rep_put(struct rpcrdma_buffer *buf,
llist_add(&rep->rr_node, &buf->rb_free_reps); llist_add(&rep->rr_node, &buf->rb_free_reps);
} }
/* Caller must ensure the QP is quiescent (RQ is drained) before
* invoking this function, to guarantee rb_all_reps is not
* changing.
*/
static void rpcrdma_reps_unmap(struct rpcrdma_xprt *r_xprt) static void rpcrdma_reps_unmap(struct rpcrdma_xprt *r_xprt)
{ {
struct rpcrdma_buffer *buf = &r_xprt->rx_buf; struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
@ -1048,7 +1052,7 @@ static void rpcrdma_reps_unmap(struct rpcrdma_xprt *r_xprt)
list_for_each_entry(rep, &buf->rb_all_reps, rr_all) { list_for_each_entry(rep, &buf->rb_all_reps, rr_all) {
rpcrdma_regbuf_dma_unmap(rep->rr_rdmabuf); rpcrdma_regbuf_dma_unmap(rep->rr_rdmabuf);
rep->rr_temp = true; rep->rr_temp = true; /* Mark this rep for destruction */
} }
} }