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From ddeacc4f6494e07cbb6f033627926623f3e7a9d0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Tue, 22 Jun 2021 07:24:15 +0200
Subject: [PATCH] net: broadcom: bcm4908_enet: reset DMA rings sw indexes
properly
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Resetting software indexes in bcm4908_dma_alloc_buf_descs() is not
enough as it's called during device probe only. Driver resets DMA on
every .ndo_open callback and it's required to reset indexes then.
This fixes inconsistent rings state and stalled traffic after interface
down & up sequence.
Fixes: 4feffeadbcb2 ("net: broadcom: bcm4908enet: add BCM4908 controller driver")
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/ethernet/broadcom/bcm4908_enet.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/net/ethernet/broadcom/bcm4908_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm4908_enet.c
@@ -174,9 +174,6 @@ static int bcm4908_dma_alloc_buf_descs(s
if (!ring->slots)
goto err_free_buf_descs;
- ring->read_idx = 0;
- ring->write_idx = 0;
-
return 0;
err_free_buf_descs:
@@ -303,6 +300,9 @@ static void bcm4908_enet_dma_ring_init(s
enet_write(enet, ring->st_ram_block + ENET_DMA_CH_STATE_RAM_BASE_DESC_PTR,
(uint32_t)ring->dma_addr);
+
+ ring->read_idx = 0;
+ ring->write_idx = 0;
}
static void bcm4908_enet_dma_uninit(struct bcm4908_enet *enet)
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