diff options
| author | Timur Tabi <timur@codeaurora.org> | 2016-10-14 14:14:35 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-10-15 17:34:43 -0400 |
| commit | 93966b715b32a783a1641f5a385901bbfab04733 (patch) | |
| tree | 4e79dc8d5a2f9ba30914935ac1c2080f0efb3b2f /drivers/net/ethernet | |
| parent | f0076436136751359e0886f3302a2a0b3a28ba6e (diff) | |
| download | linux-93966b715b32a783a1641f5a385901bbfab04733.tar.bz2 | |
net: qcom/emac: disable interrupts before calling phy_disconnect
There is a race condition that can occur if EMAC interrupts are
enabled when phy_disconnect() is called. phy_disconnect() sets
adjust_link to NULL. When an interrupt occurs, the ISR might
call phy_mac_interrupt(), which wakes up the workqueue function
phy_state_machine(). This function might reference adjust_link,
thereby causing a null pointer exception.
Signed-off-by: Timur Tabi <timur@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet')
| -rw-r--r-- | drivers/net/ethernet/qualcomm/emac/emac-mac.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/net/ethernet/qualcomm/emac/emac-mac.c b/drivers/net/ethernet/qualcomm/emac/emac-mac.c index e97968ed4b8f..6fb3bee904d3 100644 --- a/drivers/net/ethernet/qualcomm/emac/emac-mac.c +++ b/drivers/net/ethernet/qualcomm/emac/emac-mac.c @@ -1021,14 +1021,18 @@ void emac_mac_down(struct emac_adapter *adpt) napi_disable(&adpt->rx_q.napi); phy_stop(adpt->phydev); - phy_disconnect(adpt->phydev); - /* disable mac irq */ + /* Interrupts must be disabled before the PHY is disconnected, to + * avoid a race condition where adjust_link is null when we get + * an interrupt. + */ writel(DIS_INT, adpt->base + EMAC_INT_STATUS); writel(0, adpt->base + EMAC_INT_MASK); synchronize_irq(adpt->irq.irq); free_irq(adpt->irq.irq, &adpt->irq); + phy_disconnect(adpt->phydev); + emac_mac_reset(adpt); emac_tx_q_descs_free(adpt); |