linux-kernel - [PATCH V2 3/3] qca_spi: Fix reset behavior

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Message-Id: <20231129095241.31302-4-wahrenst@gmx.net>
Date:   Wed, 29 Nov 2023 10:52:41 +0100
From:   Stefan Wahren <wahrenst@....net>
To:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Lino Sanfilippo <LinoSanfilippo@....de>,
        Florian Fainelli <f.fainelli@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Stefan Wahren <wahrenst@....net>
Subject: [PATCH V2 3/3] qca_spi: Fix reset behavior

In case of a reset triggered by the QCA7000 itself, the behavior of the
qca_spi driver was not quite correct:
- in case of a pending RX frame decoding the drop counter must be
  incremented and decoding state machine reseted
- also the reset counter must always be incremented regardless of sync
  state

Fixes: 291ab06ecf67 ("net: qualcomm: new Ethernet over SPI driver for QCA7000")
Signed-off-by: Stefan Wahren <wahrenst@....net>
---
 drivers/net/ethernet/qualcomm/qca_spi.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/qualcomm/qca_spi.c b/drivers/net/ethernet/qualcomm/qca_spi.c
index 78317b85ad30..0fe2e24a42b2 100644
--- a/drivers/net/ethernet/qualcomm/qca_spi.c
+++ b/drivers/net/ethernet/qualcomm/qca_spi.c
@@ -613,11 +613,17 @@ qcaspi_spi_thread(void *data)
 			if (intr_cause & SPI_INT_CPU_ON) {
 				qcaspi_qca7k_sync(qca, QCASPI_EVENT_CPUON);

+				/* Frame decoding in progress */
+				if (qca->frm_handle.state != qca->frm_handle.init)
+					qca->net_dev->stats.rx_dropped++;
+
+				qcafrm_fsm_init_spi(&qca->frm_handle);
+				qca->stats.device_reset++;
+
 				/* not synced. */
 				if (qca->sync != QCASPI_SYNC_READY)
 					continue;

-				qca->stats.device_reset++;
 				netif_wake_queue(qca->net_dev);
 				netif_carrier_on(qca->net_dev);
 			}
--
2.34.1