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net: systemport: update UMAC_CMD only when link is detected

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When we bring the interface down, phy_stop() will schedule the PHY
state machine to call our link adjustment callback. By the time we do so,
we may have clock gated off the SYSTEMPORT hardware block, and this will
cause bus errors to happen in bcm_sysport_adj_link():

Make sure that we only touch the UMAC_CMD register when there is an
actual link. This is safe to do for two reasons:

- updating the Ethernet MAC registers only make sense when a physical
  link is present
- the PHY library state machine first set phydev->link = 0 before
  invoking phydev->adjust_link in the PHY_HALTED case

This is a similar fix to the GENET one:
c677ba8b3c ("net: bcmgenet: update
UMAC_CMD only when link is detected").

Fixes: 80105befdb ("net: systemport: add Broadcom SYSTEMPORT Ethernet MAC driver")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2014-09-02 11:17:07 -07:00 committed by David S. Miller
parent a9fe8e2994
commit 4a804c0163
1 changed files with 6 additions and 3 deletions
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9
drivers/net/ethernet/broadcom/bcmsysport.c
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@ -1071,16 +1071,19 @@ static void bcm_sysport_adj_link(struct net_device *dev)
if (!phydev->pause)
cmd_bits |= CMD_RX_PAUSE_IGNORE | CMD_TX_PAUSE_IGNORE;
if (changed) {
if (!changed)
return;
if (phydev->link) {
reg = umac_readl(priv, UMAC_CMD);
reg &= ~((CMD_SPEED_MASK << CMD_SPEED_SHIFT) |
CMD_HD_EN | CMD_RX_PAUSE_IGNORE |
CMD_TX_PAUSE_IGNORE);
reg |= cmd_bits;
umac_writel(priv, reg, UMAC_CMD);
phy_print_status(priv->phydev);
}
phy_print_status(priv->phydev);
}
static int bcm_sysport_init_tx_ring(struct bcm_sysport_priv *priv,