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net: fec: remove .ndo_poll_controller to avoid deadlocks

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There is a deadlock issue found in sungem driver, please refer to the
commit ac0a230f71 ("eth: sungem: remove .ndo_poll_controller to avoid
deadlocks"). The root cause of the issue is that netpoll is in atomic
context and disable_irq() is called by .ndo_poll_controller interface
of sungem driver, however, disable_irq() might sleep. After analyzing
the implementation of fec_poll_controller(), the fec driver should have
the same issue. Due to the fec driver uses NAPI for TX completions, the
.ndo_poll_controller is unnecessary to be implemented in the fec driver,
so fec_poll_controller() can be safely removed.

Fixes: 7f5c6addcd ("net/fec: add poll controller function for fec nic")
Signed-off-by: Wei Fang <wei.fang@nxp.com>
Link: https://lore.kernel.org/r/20240511062009.652918-1-wei.fang@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Wei Fang 2024-05-11 14:20:09 +08:00 committed by Jakub Kicinski
parent ad506586cb
commit c2e0c58b25
1 changed files with 0 additions and 26 deletions
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26
drivers/net/ethernet/freescale/fec_main.c
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@ -3674,29 +3674,6 @@ fec_set_mac_address(struct net_device *ndev, void *p)
return 0;
}
#ifdef CONFIG_NET_POLL_CONTROLLER
/**
* fec_poll_controller - FEC Poll controller function
* @dev: The FEC network adapter
*
* Polled functionality used by netconsole and others in non interrupt mode
*
*/
static void fec_poll_controller(struct net_device *dev)
{
int i;
struct fec_enet_private *fep = netdev_priv(dev);
for (i = 0; i < FEC_IRQ_NUM; i++) {
if (fep->irq[i] > 0) {
disable_irq(fep->irq[i]);
fec_enet_interrupt(fep->irq[i], dev);
enable_irq(fep->irq[i]);
}
}
}
#endif
static inline void fec_enet_set_netdev_features(struct net_device *netdev,
netdev_features_t features)
{
@ -4003,9 +3980,6 @@ static const struct net_device_ops fec_netdev_ops = {
.ndo_tx_timeout = fec_timeout,
.ndo_set_mac_address = fec_set_mac_address,
.ndo_eth_ioctl = phy_do_ioctl_running,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = fec_poll_controller,
#endif
.ndo_set_features = fec_set_features,
.ndo_bpf = fec_enet_bpf,
.ndo_xdp_xmit = fec_enet_xdp_xmit,