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net: phylink: fix ethtool -A with attached PHYs 

Fix a phylink's ethtool set_pauseparam support deadlock caused by phylib
interacting with phylink: we must not hold the state lock while calling
phylib functions that may call into phylink_phy_change().

Fixes: f904f15ea9 ("net: phylink: allow ethtool -A to change flow control advertisement")
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Russell King 2020-06-23 17:47:23 +01:00 committed by David S. Miller
parent 41b14fb872
commit c718af2d00
1 changed files with 11 additions and 9 deletions
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20
drivers/net/phy/phylink.c
View File

@ -1502,18 +1502,20 @@ int phylink_ethtool_set_pauseparam(struct phylink *pl,
linkmode_set_pause(config->advertising, pause->tx_pause,
pause->rx_pause);
/* If we have a PHY, phylib will call our link state function if the
* mode has changed, which will trigger a resolve and update the MAC
* configuration.
if (!pl->phydev && !test_bit(PHYLINK_DISABLE_STOPPED,
&pl->phylink_disable_state))
phylink_pcs_config(pl, true, &pl->link_config);
mutex_unlock(&pl->state_mutex);
/* If we have a PHY, a change of the pause frame advertisement will
* cause phylib to renegotiate (if AN is enabled) which will in turn
* call our phylink_phy_change() and trigger a resolve. Note that
* we can't hold our state mutex while calling phy_set_asym_pause().
*/
if (pl->phydev) {
if (pl->phydev)
phy_set_asym_pause(pl->phydev, pause->rx_pause,
pause->tx_pause);
} else if (!test_bit(PHYLINK_DISABLE_STOPPED,
&pl->phylink_disable_state)) {
phylink_pcs_config(pl, true, &pl->link_config);
}
mutex_unlock(&pl->state_mutex);
return 0;
}