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

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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>
This commit is contained in:
Ben Hutchings 2015-01-22 12:41:34 +00:00 committed by David S. Miller
parent bd8889163a
commit 084236d8c5
1 changed files with 18 additions and 16 deletions
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34
drivers/net/ethernet/renesas/sh_eth.c
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@ -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);