From: Wei Fang <wei.fang@nxp.com>
To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
pabeni@redhat.com, shenwei.wang@nxp.com, xiaoning.wang@nxp.com,
netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, imx@lists.linux.dev
Subject: [PATCH net] net: fec: remove .ndo_poll_controller to avoid deadlocks
Date: Sat, 11 May 2024 14:20:09 +0800 [thread overview]
Message-ID: <20240511062009.652918-1-wei.fang@nxp.com> (raw)
There is a deadlock issue found in sungem driver, please refer to the
commit ac0a230f719b ("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: 7f5c6addcdc0 ("net/fec: add poll controller function for fec nic")
Signed-off-by: Wei Fang <wei.fang@nxp.com>
---
drivers/net/ethernet/freescale/fec_main.c | 26 -----------------------
1 file changed, 26 deletions(-)
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 8bd213da8fb6..a72d8a2eb0b3 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -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,
--
2.34.1
next reply other threads:[~2024-05-11 6:31 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-11 6:20 Wei Fang [this message]
2024-05-14 1:00 ` [PATCH net] net: fec: remove .ndo_poll_controller to avoid deadlocks patchwork-bot+netdevbpf
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