Commit 448c6fb3 authored by Jon Mason's avatar Jon Mason Committed by Greg Kroah-Hartman
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NTB: Out of free receive entries issue

If the NTB client driver enqueues the maximum number of rx buffers, it
will not be able to re-enqueue another in its callback handler due to a
lack of free entries.  This can be avoided by adding the current entry
to the free queue prior to calling the client callback handler.  With
this change, ntb_netdev will no longer encounter a rx error on its first

Signed-off-by: default avatarJon Mason <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent 793c20e9
......@@ -910,12 +910,15 @@ void ntb_transport_free(void *transport)
static void ntb_rx_copy_task(struct ntb_transport_qp *qp,
struct ntb_queue_entry *entry, void *offset)
memcpy(entry->buf, offset, entry->len);
void *cb_data = entry->cb_data;
unsigned int len = entry->len;
if (qp->rx_handler && qp->client_ready == NTB_LINK_UP)
qp->rx_handler(qp, qp->cb_data, entry->cb_data, entry->len);
memcpy(entry->buf, offset, entry->len);
ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q);
if (qp->rx_handler && qp->client_ready == NTB_LINK_UP)
qp->rx_handler(qp, qp->cb_data, cb_data, len);
static int ntb_process_rxc(struct ntb_transport_qp *qp)
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