This is a note to let you know that I've just added the patch titled sfc: farch: fix TX queue lookup in TX flush done handling to the 5.11-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: sfc-farch-fix-tx-queue-lookup-in-tx-flush-done-handling.patch and it can be found in the queue-5.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 5b1faa92289b53cad654123ed2bc8e10f6ddd4ac Mon Sep 17 00:00:00 2001 From: Edward Cree <ecree.xilinx@xxxxxxxxx> Date: Tue, 20 Apr 2021 13:27:22 +0100 Subject: sfc: farch: fix TX queue lookup in TX flush done handling From: Edward Cree <ecree.xilinx@xxxxxxxxx> commit 5b1faa92289b53cad654123ed2bc8e10f6ddd4ac upstream. We're starting from a TXQ instance number ('qid'), not a TXQ type, so efx_get_tx_queue() is inappropriate (and could return NULL, leading to panics). Fixes: 12804793b17c ("sfc: decouple TXQ type from label") Reported-by: Trevor Hemsley <themsley@xxxxxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Edward Cree <ecree.xilinx@xxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/net/ethernet/sfc/farch.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) --- a/drivers/net/ethernet/sfc/farch.c +++ b/drivers/net/ethernet/sfc/farch.c @@ -1081,16 +1081,16 @@ static void efx_farch_handle_tx_flush_done(struct efx_nic *efx, efx_qword_t *event) { struct efx_tx_queue *tx_queue; + struct efx_channel *channel; int qid; qid = EFX_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_SUBDATA); if (qid < EFX_MAX_TXQ_PER_CHANNEL * (efx->n_tx_channels + efx->n_extra_tx_channels)) { - tx_queue = efx_get_tx_queue(efx, qid / EFX_MAX_TXQ_PER_CHANNEL, - qid % EFX_MAX_TXQ_PER_CHANNEL); - if (atomic_cmpxchg(&tx_queue->flush_outstanding, 1, 0)) { + channel = efx_get_tx_channel(efx, qid / EFX_MAX_TXQ_PER_CHANNEL); + tx_queue = channel->tx_queue + (qid % EFX_MAX_TXQ_PER_CHANNEL); + if (atomic_cmpxchg(&tx_queue->flush_outstanding, 1, 0)) efx_farch_magic_event(tx_queue->channel, EFX_CHANNEL_MAGIC_TX_DRAIN(tx_queue)); - } } } Patches currently in stable-queue which might be from ecree.xilinx@xxxxxxxxx are queue-5.11/sfc-farch-fix-tx-queue-lookup-in-tx-flush-done-handling.patch queue-5.11/sfc-farch-fix-tx-queue-lookup-in-tx-event-handling.patch