sh_eth: Fix crash or memory leak when resizing rings on device that is down

If the device is down then no packet buffers should be allocated.
We also must not touch its registers as it may be powered off.

Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index fa8a7b775b4ac42180cd64f71476d7d1349369e3..7facda1328f8bd35f6b688e0f251182ecaac2fd5 100644 (file)
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -1976,29 +1976,31 @@ static int sh_eth_set_ringparam(struct net_device *ndev,
                sh_eth_write(ndev, 0, EDTRR);
                sh_eth_write(ndev, 0, EDRRR);
                synchronize_irq(ndev->irq);
-       }
 
-       /* Free all the skbuffs in the Rx queue. */
-       sh_eth_ring_free(ndev);
-       /* Free DMA buffer */
-       sh_eth_free_dma_buffer(mdp);
+               /* Free all the skbuffs in the Rx queue. */
+               sh_eth_ring_free(ndev);
+               /* Free DMA buffer */
+               sh_eth_free_dma_buffer(mdp);
+       }
 
        /* Set new parameters */
        mdp->num_rx_ring = ring->rx_pending;
        mdp->num_tx_ring = ring->tx_pending;
 
-       ret = sh_eth_ring_init(ndev);
-       if (ret < 0) {
-               netdev_err(ndev, "%s: sh_eth_ring_init failed.\n", __func__);
-               return ret;
-       }
-       ret = sh_eth_dev_init(ndev, false);
-       if (ret < 0) {
-               netdev_err(ndev, "%s: sh_eth_dev_init failed.\n", __func__);
-               return ret;
-       }
-
        if (netif_running(ndev)) {
+               ret = sh_eth_ring_init(ndev);
+               if (ret < 0) {
+                       netdev_err(ndev, "%s: sh_eth_ring_init failed.\n",
+                                  __func__);
+                       return ret;
+               }
+               ret = sh_eth_dev_init(ndev, false);
+               if (ret < 0) {
+                       netdev_err(ndev, "%s: sh_eth_dev_init failed.\n",
+                                  __func__);
+                       return ret;
+               }
+
                sh_eth_write(ndev, mdp->cd->eesipr_value, EESIPR);
                /* Setting the Rx mode will start the Rx process. */
                sh_eth_write(ndev, EDRRR_R, EDRRR);