[RESEND PATCH net 07/10] net: ethernet: mediatek: fix issue of driver removal with interface is up

[Sean Wang]

1) mtk_stop() must be called to stop for freeing DMA resources
acquired and restoring state changed by mtk_open() when module
removal.

2) group clock disabled related function into mtk_hw_deinit which
could be reused with others functionality such as the whole ethernet
reset that would be posted in the later series of patches.

Signed-off-by: Sean Wang <sean.w...@mediatek.com>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c 
b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 0a4c782..c573475 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1478,6 +1478,16 @@ static int __init mtk_hw_init(struct mtk_eth *eth)
        return 0;
 }
 
+static int mtk_hw_deinit(struct mtk_eth *eth)
+{
+       clk_disable_unprepare(eth->clk_esw);
+       clk_disable_unprepare(eth->clk_gp1);
+       clk_disable_unprepare(eth->clk_gp2);
+       clk_disable_unprepare(eth->clk_ethif);
+
+       return 0;
+}
+
 static int __init mtk_init(struct net_device *dev)
 {
        struct mtk_mac *mac = netdev_priv(dev);
@@ -1919,11 +1929,15 @@ err_free_dev:
 static int mtk_remove(struct platform_device *pdev)
 {
        struct mtk_eth *eth = platform_get_drvdata(pdev);
+       int i;
 
-       clk_disable_unprepare(eth->clk_ethif);
-       clk_disable_unprepare(eth->clk_esw);
-       clk_disable_unprepare(eth->clk_gp1);
-       clk_disable_unprepare(eth->clk_gp2);
+       /* stop all devices to make sure that dma is properly shut down */
+       for (i = 0; i < MTK_MAC_COUNT; i++) {
+               if (!eth->netdev[i])
+                       continue;
+               mtk_stop(eth->netdev[i]);
+       }
+       mtk_hw_deinit(eth);
 
        netif_napi_del(&eth->tx_napi);
        netif_napi_del(&eth->rx_napi);
-- 
1.9.1