net: ravb: Ensure memory write completes before ringing TX doorbell

commit 706136c5723626fcde8dd8f598a4dcd251e24927 upstream.

Add a final dma_wmb() barrier before triggering the transmit request
(TCCR_TSRQ) to ensure all descriptor and buffer writes are visible to
the DMA engine.

According to the hardware manual, a read-back operation is required
before writing to the doorbell register to guarantee completion of
previous writes. Instead of performing a dummy read, a dma_wmb() is
used to both enforce the same ordering semantics on the CPU side and
also to ensure completion of writes.

Fixes: c156633 ("Renesas Ethernet AVB driver proper")
Cc: stable@vger.kernel.org
Co-developed-by: Fabrizio Castro <fabrizio.castro.jz@renesas.com>
Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@renesas.com>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://patch.msgid.link/20251017151830.171062-5-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[uli: backport to 4.19]
Signed-off-by: Ulrich Hecht <uli@kernel.org>

Author: prabhakarlad

drivers/net/ethernet/renesas/ravb_main.c

@@ -1591,6 +1591,13 @@ static netdev_tx_t ravb_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 	desc--;
 	desc->die_dt = DT_FSTART;
 
+	/* Before ringing the doorbell we need to make sure that the latest
+	 * writes have been committed to memory, otherwise it could delay
+	 * things until the doorbell is rang again.
+	 * This is in replacement of the read operation mentioned in the HW
+	 * manuals.
+	 */
+	dma_wmb();
 	ravb_modify(ndev, TCCR, TCCR_TSRQ0 << q, TCCR_TSRQ0 << q);
 
 	priv->cur_tx[q] += NUM_TX_DESC;