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Date:   Tue, 21 Jul 2020 15:23:12 +0900
From:   Yoshihiro Shimoda <>
        Yoshihiro Shimoda <>
Subject: [PATCH v3] net: ethernet: ravb: exit if re-initialization fails in tx timeout

According to the report of [1], this driver is possible to cause
the following error in ravb_tx_timeout_work().

ravb e6800000.ethernet ethernet: failed to switch device to config mode

This error means that the hardware could not change the state
from "Operation" to "Configuration" while some tx and/or rx queue
are operating. After that, ravb_config() in ravb_dmac_init() will fail,
and then any descriptors will be not allocaled anymore so that NULL
pointer dereference happens after that on ravb_start_xmit().

To fix the issue, the ravb_tx_timeout_work() should check
the return values of ravb_stop_dma() and ravb_dmac_init().
If ravb_stop_dma() fails, ravb_tx_timeout_work() re-enables TX and RX
and just exits. If ravb_dmac_init() fails, just exits.


Reported-by: Dirk Behme <>
Signed-off-by: Yoshihiro Shimoda <>
Reviewed-by: Sergei Shtylyov <>
 Changes from RFC v2:
 - Check the return value of ravb_init_dmac() too.
 - Update the subject and description.
 - Fix the comment in the code.
 - Add Reviewed-by Sergei.

 Changes from RFC v1:
 - Check the return value of ravb_stop_dma() and exit if the hardware
   condition can not be initialized in the tx timeout.
 - Update the commit subject and description.
 - Fix some typo.

 Unfortunately, I still didn't reproduce the issue yet. But,
 I got review from Sergei in v2. So, I removed RFC on this patch.

 drivers/net/ethernet/renesas/ravb_main.c | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index a442bcf6..99f7aae 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -1450,6 +1450,7 @@ static void ravb_tx_timeout_work(struct work_struct *work)
 	struct ravb_private *priv = container_of(work, struct ravb_private,
 	struct net_device *ndev = priv->ndev;
+	int error;
@@ -1458,15 +1459,36 @@ static void ravb_tx_timeout_work(struct work_struct *work)
 	/* Wait for DMA stopping */
-	ravb_stop_dma(ndev);
+	if (ravb_stop_dma(ndev)) {
+		/* If ravb_stop_dma() fails, the hardware is still operating
+		 * for TX and/or RX. So, this should not call the following
+		 * functions because ravb_dmac_init() is possible to fail too.
+		 * Also, this should not retry ravb_stop_dma() again and again
+		 * here because it's possible to wait forever. So, this just
+		 * re-enables the TX and RX and skip the following
+		 * re-initialization procedure.
+		 */
+		ravb_rcv_snd_enable(ndev);
+		goto out;
+	}
 	ravb_ring_free(ndev, RAVB_BE);
 	ravb_ring_free(ndev, RAVB_NC);
 	/* Device init */
-	ravb_dmac_init(ndev);
+	error = ravb_dmac_init(ndev);
+	if (error) {
+		/* If ravb_dmac_init() fails, descriptors are freed. So, this
+		 * should return here to avoid re-enabling the TX and RX in
+		 * ravb_emac_init().
+		 */
+		netdev_err(ndev, "%s: ravb_dmac_init() failed, error %d\n",
+			   __func__, error);
+		return;
+	}
 	/* Initialise PTP Clock driver */
 	if (priv->chip_id == RCAR_GEN2)
 		ravb_ptp_init(ndev, priv->pdev);

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