stmmac: fix resource management when resume

There is a memleak when suspend/resume this driver version.
Currently the stmmac, during resume step, reallocates all the resources
but they are not released when suspend.
The patch is not to release these resources but the logic has been changed.
In fact, it is not necessary to free and reallocate all from scratch
because the memory data will be always preserved.
As final solution, the patch just reinit the descriptors and the rx/tx
pointers only when resume. Tested done on STi boxes.

Reported-by: ZhengShunQian <zhengsq@rock-chips.com>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 3c6549aee11dee5cf13c92c90c5b4b7a8618f375..a5b869eb46783e338708f93c31f33524116e637f 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3046,8 +3046,6 @@ int stmmac_suspend(struct net_device *ndev)
        priv->hw->dma->stop_tx(priv->ioaddr);
        priv->hw->dma->stop_rx(priv->ioaddr);
 
-       stmmac_clear_descriptors(priv);
-
        /* Enable Power down mode by programming the PMT regs */
        if (device_may_wakeup(priv->device)) {
                priv->hw->mac->pmt(priv->hw, priv->wolopts);
@@ -3105,7 +3103,12 @@ int stmmac_resume(struct net_device *ndev)
 
        netif_device_attach(ndev);
 
-       init_dma_desc_rings(ndev, GFP_ATOMIC);
+       priv->cur_rx = 0;
+       priv->dirty_rx = 0;
+       priv->dirty_tx = 0;
+       priv->cur_tx = 0;
+       stmmac_clear_descriptors(priv);
+
        stmmac_hw_setup(ndev, false);
        stmmac_init_tx_coalesce(priv);
        stmmac_set_rx_mode(ndev);