net: sgi: ioc3-eth: ensure tx ring is 16k aligned.

IOC3 hardware needs a 16k aligned TX ring.

Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/sgi/ioc3-eth.c b/drivers/net/ethernet/sgi/ioc3-eth.c
index 1af6882..d242906 100644 (file)
--- a/drivers/net/ethernet/sgi/ioc3-eth.c
+++ b/drivers/net/ethernet/sgi/ioc3-eth.c
@@ -89,6 +89,7 @@ struct ioc3_private {
        struct device *dma_dev;
        u32 *ssram;
        unsigned long *rxr;             /* pointer to receiver ring */
+       void *tx_ring;
        struct ioc3_etxd *txr;
        dma_addr_t rxr_dma;
        dma_addr_t txr_dma;
@@ -1236,13 +1237,16 @@ static int ioc3_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
        }
 
        /* Allocate tx rings.  16kb = 128 bufs, must be 16kb aligned  */
-       ip->txr = dma_alloc_coherent(ip->dma_dev, TX_RING_SIZE, &ip->txr_dma,
-                                    GFP_KERNEL);
-       if (!ip->txr) {
+       ip->tx_ring = dma_alloc_coherent(ip->dma_dev, TX_RING_SIZE + SZ_16K - 1,
+                                        &ip->txr_dma, GFP_KERNEL);
+       if (!ip->tx_ring) {
                pr_err("ioc3-eth: tx ring allocation failed\n");
                err = -ENOMEM;
                goto out_stop;
        }
+       /* Align TX ring */
+       ip->txr = PTR_ALIGN(ip->tx_ring, SZ_16K);
+       ip->txr_dma = ALIGN(ip->txr_dma, SZ_16K);
 
        ioc3_init(dev);
 
@@ -1299,8 +1303,8 @@ out_stop:
        if (ip->rxr)
                dma_free_coherent(ip->dma_dev, RX_RING_SIZE, ip->rxr,
                                  ip->rxr_dma);
-       if (ip->txr)
-               dma_free_coherent(ip->dma_dev, TX_RING_SIZE, ip->txr,
+       if (ip->tx_ring)
+               dma_free_coherent(ip->dma_dev, TX_RING_SIZE, ip->tx_ring,
                                  ip->txr_dma);
 out_res:
        pci_release_regions(pdev);
@@ -1320,7 +1324,7 @@ static void ioc3_remove_one(struct pci_dev *pdev)
        struct ioc3_private *ip = netdev_priv(dev);
 
        dma_free_coherent(ip->dma_dev, RX_RING_SIZE, ip->rxr, ip->rxr_dma);
-       dma_free_coherent(ip->dma_dev, TX_RING_SIZE, ip->txr, ip->txr_dma);
+       dma_free_coherent(ip->dma_dev, TX_RING_SIZE, ip->tx_ring, ip->txr_dma);
 
        unregister_netdev(dev);
        del_timer_sync(&ip->ioc3_timer);