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sfc: farch: fix TX queue lookup in TX event handling

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commit 83b09a1807415608b387c7bc748d329fefc5617e upstream.

We're starting from a TXQ label, not a TXQ type, so
 efx_channel_get_tx_queue() is inappropriate (and could return NULL,
 leading to panics).

Fixes: 12804793b1 ("sfc: decouple TXQ type from label")
Cc: stable@vger.kernel.org
Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Edward Cree 2021-04-20 13:28:28 +01:00 committed by Greg Kroah-Hartman
parent fb791572d6
commit bf2b941d0a
1 changed files with 4 additions and 4 deletions
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8
drivers/net/ethernet/sfc/farch.c
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@ -835,14 +835,14 @@ efx_farch_handle_tx_event(struct efx_channel *channel, efx_qword_t *event)
/* Transmit completion */
tx_ev_desc_ptr = EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_DESC_PTR);
tx_ev_q_label = EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_Q_LABEL);
tx_queue = efx_channel_get_tx_queue(
channel, tx_ev_q_label % EFX_MAX_TXQ_PER_CHANNEL);
tx_queue = channel->tx_queue +
(tx_ev_q_label % EFX_MAX_TXQ_PER_CHANNEL);
efx_xmit_done(tx_queue, tx_ev_desc_ptr);
} else if (EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_WQ_FF_FULL)) {
/* Rewrite the FIFO write pointer */
tx_ev_q_label = EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_Q_LABEL);
tx_queue = efx_channel_get_tx_queue(
channel, tx_ev_q_label % EFX_MAX_TXQ_PER_CHANNEL);
tx_queue = channel->tx_queue +
(tx_ev_q_label % EFX_MAX_TXQ_PER_CHANNEL);
netif_tx_lock(efx->net_dev);
efx_farch_notify_tx_desc(tx_queue);