[PATCH net v5 3/5] net: ethernet: mtk_wed: free up rings during detach

[Zhi-Jun You <hujy652@gmail.com>]

During __mtk_wed_detach, rx_ring and tx_wdma aren't freed up.

Fix this by add them to mtk_wed_free_rx_rings, also set
MTK_WED_RING_CONFIGURED flag in tx/rx ring and wdma tx/rx ring setup.
Only free rings that has the flag set.

This patch is pulled from mtk-openwrt-feeds to address Sashiko's review.

Link: https://github.com/mediatek/mtk-openwrt-feeds/blob/main/25.12/files/target/linux/mediatek/patches-6.12/999-wed-04-Fix-reinsert-wifi-module-cause-memory-leak-issue.patch
Fixes: 4c5de09eb0d0 ("net: ethernet: mtk_wed: add configure wed wo support")
Signed-off-by: Zhi-Jun You <hujy652@gmail.com>
---
 drivers/net/ethernet/mediatek/mtk_wed.c | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_wed.c b/drivers/net/ethernet/mediatek/mtk_wed.c
index 3f0be70c3f14..b8264435acbe 100644
--- a/drivers/net/ethernet/mediatek/mtk_wed.c
+++ b/drivers/net/ethernet/mediatek/mtk_wed.c
@@ -949,6 +949,16 @@ mtk_wed_free_ring(struct mtk_wed_device *dev, struct mtk_wed_ring *ring)
 static void
 mtk_wed_free_rx_rings(struct mtk_wed_device *dev)
 {
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(dev->rx_ring); i++)
+		if ((dev->tx_ring[i].flags & MTK_WED_RING_CONFIGURED))
+			mtk_wed_free_ring(dev, &dev->rx_ring[i]);
+
+	for (i = 0; i < ARRAY_SIZE(dev->tx_wdma); i++)
+		if ((dev->tx_wdma[i].flags & MTK_WED_RING_CONFIGURED))
+			mtk_wed_free_ring(dev, &dev->tx_wdma[i]);
+
 	mtk_wed_free_rx_buffer(dev);
 	mtk_wed_free_ring(dev, &dev->rro.ring);
 }
@@ -959,9 +969,11 @@ mtk_wed_free_tx_rings(struct mtk_wed_device *dev)
 	int i;
 
 	for (i = 0; i < ARRAY_SIZE(dev->tx_ring); i++)
-		mtk_wed_free_ring(dev, &dev->tx_ring[i]);
+		if ((dev->tx_ring[i].flags & MTK_WED_RING_CONFIGURED))
+			mtk_wed_free_ring(dev, &dev->tx_ring[i]);
 	for (i = 0; i < ARRAY_SIZE(dev->rx_wdma); i++)
-		mtk_wed_free_ring(dev, &dev->rx_wdma[i]);
+		if ((dev->rx_wdma[i].flags & MTK_WED_RING_CONFIGURED))
+			mtk_wed_free_ring(dev, &dev->rx_wdma[i]);
 }
 
 static void
@@ -1885,6 +1897,8 @@ mtk_wed_wdma_rx_ring_setup(struct mtk_wed_device *dev, int idx, int size,
 					 dev->hw->soc->wdma_desc_size, true))
 		return -ENOMEM;
 
+	wdma->flags |= MTK_WED_RING_CONFIGURED;
+
 	wdma_w32(dev, MTK_WDMA_RING_RX(idx) + MTK_WED_RING_OFS_BASE,
 		 wdma->desc_phys);
 	wdma_w32(dev, MTK_WDMA_RING_RX(idx) + MTK_WED_RING_OFS_COUNT,
@@ -1931,6 +1945,8 @@ mtk_wed_wdma_tx_ring_setup(struct mtk_wed_device *dev, int idx, int size,
 		}
 	}
 
+	wdma->flags |= MTK_WED_RING_CONFIGURED;
+
 	wdma_w32(dev, MTK_WDMA_RING_TX(idx) + MTK_WED_RING_OFS_BASE,
 		 wdma->desc_phys);
 	wdma_w32(dev, MTK_WDMA_RING_TX(idx) + MTK_WED_RING_OFS_COUNT,
@@ -2504,6 +2520,7 @@ mtk_wed_tx_ring_setup(struct mtk_wed_device *dev, int idx, void __iomem *regs,
 
 	ring->reg_base = MTK_WED_RING_TX(idx);
 	ring->wpdma = regs;
+	ring->flags |= MTK_WED_RING_CONFIGURED;
 
 	if (mtk_wed_is_v3_or_greater(dev->hw) && idx == 1) {
 		/* reset prefetch index */

-- 
2.47.3