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From 65deca92de124fb184efc5cfa711b26eac5704c6 Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Thu, 18 Apr 2024 11:05:41 -0700
Subject: net: bcmasp: fix memory leak when bringing down interface
From: Justin Chen <justin.chen@broadcom.com>
[ Upstream commit 9f898fc2c31fbf0ac5ecd289f528a716464cb005 ]
When bringing down the TX rings we flush the rings but forget to
reclaimed the flushed packets. This leads to a memory leak since we
do not free the dma mapped buffers. This also leads to tx control
block corruption when bringing down the interface for power
management.
Fixes: 490cb412007d ("net: bcmasp: Add support for ASP2.0 Ethernet controller")
Signed-off-by: Justin Chen <justin.chen@broadcom.com>
Acked-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20240418180541.2271719-1-justin.chen@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../net/ethernet/broadcom/asp2/bcmasp_intf.c | 21 ++++++++++++-------
1 file changed, 14 insertions(+), 7 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c b/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
index 78901e2e73032..529172a87ae50 100644
--- a/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
+++ b/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
@@ -435,10 +435,8 @@ static void umac_init(struct bcmasp_intf *intf)
umac_wl(intf, 0x800, UMC_RX_MAX_PKT_SZ);
}
-static int bcmasp_tx_poll(struct napi_struct *napi, int budget)
+static int bcmasp_tx_reclaim(struct bcmasp_intf *intf)
{
- struct bcmasp_intf *intf =
- container_of(napi, struct bcmasp_intf, tx_napi);
struct bcmasp_intf_stats64 *stats = &intf->stats64;
struct device *kdev = &intf->parent->pdev->dev;
unsigned long read, released = 0;
@@ -481,10 +479,16 @@ static int bcmasp_tx_poll(struct napi_struct *napi, int budget)
DESC_RING_COUNT);
}
- /* Ensure all descriptors have been written to DRAM for the hardware
- * to see updated contents.
- */
- wmb();
+ return released;
+}
+
+static int bcmasp_tx_poll(struct napi_struct *napi, int budget)
+{
+ struct bcmasp_intf *intf =
+ container_of(napi, struct bcmasp_intf, tx_napi);
+ int released = 0;
+
+ released = bcmasp_tx_reclaim(intf);
napi_complete(&intf->tx_napi);
@@ -796,6 +800,7 @@ static int bcmasp_init_tx(struct bcmasp_intf *intf)
intf->tx_spb_index = 0;
intf->tx_spb_clean_index = 0;
+ memset(intf->tx_cbs, 0, sizeof(struct bcmasp_tx_cb) * DESC_RING_COUNT);
netif_napi_add_tx(intf->ndev, &intf->tx_napi, bcmasp_tx_poll);
@@ -906,6 +911,8 @@ static void bcmasp_netif_deinit(struct net_device *dev)
} while (timeout-- > 0);
tx_spb_dma_wl(intf, 0x0, TX_SPB_DMA_FIFO_CTRL);
+ bcmasp_tx_reclaim(intf);
+
umac_enable_set(intf, UMC_CMD_TX_EN, 0);
phy_stop(dev->phydev);
--
2.43.0
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