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authorRob Herring <r.herring@freescale.com>2010-02-05 11:56:20 +0300
committerDavid S. Miller <davem@davemloft.net>2010-02-11 00:05:42 +0300
commit633e7533cec78b99d806248e832fc83e689d2453 (patch)
treece20891b9038d35d21687957491383ed9e167ce8 /drivers/net/fec.c
parent67de792420be2daa1c6fec07ec8552af9ea0bde3 (diff)
downloadlinux-633e7533cec78b99d806248e832fc83e689d2453.tar.xz
fec: fix uninitialized rx buffer usage
The fec driver was enabling receive buffer descriptor without allocating the buffers. Make sure the buffer descriptors are initialized to not start receiving packets. Open also calls fec_restart after the rx buffers are allocated. With the code in fec_restart, it zeroes out the buffer descriptors that have just been setup. Signed-off-by: Rob Herring <r.herring@freescale.com> Signed-off-by: Amit Kucheria <amit.kucheria@canonical.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Greg Ungerer <gerg@uclinux.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/fec.c')
-rw-r--r--drivers/net/fec.c57
1 files changed, 29 insertions, 28 deletions
diff --git a/drivers/net/fec.c b/drivers/net/fec.c
index 16a1d58419d9..9a8743daa3e5 100644
--- a/drivers/net/fec.c
+++ b/drivers/net/fec.c
@@ -1658,6 +1658,7 @@ static int fec_enet_init(struct net_device *dev, int index)
{
struct fec_enet_private *fep = netdev_priv(dev);
struct bufdesc *cbd_base;
+ struct bufdesc *bdp;
int i;
/* Allocate memory for buffer descriptors. */
@@ -1710,6 +1711,34 @@ static int fec_enet_init(struct net_device *dev, int index)
/* Set MII speed to 2.5 MHz */
fep->phy_speed = ((((clk_get_rate(fep->clk) / 2 + 4999999)
/ 2500000) / 2) & 0x3F) << 1;
+
+ /* Initialize the receive buffer descriptors. */
+ bdp = fep->rx_bd_base;
+ for (i = 0; i < RX_RING_SIZE; i++) {
+
+ /* Initialize the BD for every fragment in the page. */
+ bdp->cbd_sc = 0;
+ bdp++;
+ }
+
+ /* Set the last buffer to wrap */
+ bdp--;
+ bdp->cbd_sc |= BD_SC_WRAP;
+
+ /* ...and the same for transmit */
+ bdp = fep->tx_bd_base;
+ for (i = 0; i < TX_RING_SIZE; i++) {
+
+ /* Initialize the BD for every fragment in the page. */
+ bdp->cbd_sc = 0;
+ bdp->cbd_bufaddr = 0;
+ bdp++;
+ }
+
+ /* Set the last buffer to wrap */
+ bdp--;
+ bdp->cbd_sc |= BD_SC_WRAP;
+
fec_restart(dev, 0);
/* Queue up command to detect the PHY and initialize the
@@ -1730,7 +1759,6 @@ static void
fec_restart(struct net_device *dev, int duplex)
{
struct fec_enet_private *fep = netdev_priv(dev);
- struct bufdesc *bdp;
int i;
/* Whack a reset. We should wait for this. */
@@ -1768,33 +1796,6 @@ fec_restart(struct net_device *dev, int duplex)
}
}
- /* Initialize the receive buffer descriptors. */
- bdp = fep->rx_bd_base;
- for (i = 0; i < RX_RING_SIZE; i++) {
-
- /* Initialize the BD for every fragment in the page. */
- bdp->cbd_sc = BD_ENET_RX_EMPTY;
- bdp++;
- }
-
- /* Set the last buffer to wrap */
- bdp--;
- bdp->cbd_sc |= BD_SC_WRAP;
-
- /* ...and the same for transmit */
- bdp = fep->tx_bd_base;
- for (i = 0; i < TX_RING_SIZE; i++) {
-
- /* Initialize the BD for every fragment in the page. */
- bdp->cbd_sc = 0;
- bdp->cbd_bufaddr = 0;
- bdp++;
- }
-
- /* Set the last buffer to wrap */
- bdp--;
- bdp->cbd_sc |= BD_SC_WRAP;
-
/* Enable MII mode */
if (duplex) {
/* MII enable / FD enable */