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net: fec: fix the unhandled context fault from smmu

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When repeatedly changing the interface link speed using the command below:

ethtool -s eth0 speed 100 duplex full
ethtool -s eth0 speed 1000 duplex full

The following errors may sometimes be reported by the ARM SMMU driver:

[ 5395.035364] fec 5b040000.ethernet eth0: Link is Down
[ 5395.039255] arm-smmu 51400000.iommu: Unhandled context fault:
fsr=0x402, iova=0x00000000, fsynr=0x100001, cbfrsynra=0x852, cb=2
[ 5398.108460] fec 5b040000.ethernet eth0: Link is Up - 100Mbps/Full -
flow control off

It is identified that the FEC driver does not properly stop the TX queue
during the link speed transitions, and this results in the invalid virtual
I/O address translations from the SMMU and causes the context faults.

Fixes: dbc64a8ea2 ("net: fec: move calls to quiesce/resume packet processing out of fec_restart()")
Signed-off-by: Shenwei Wang <shenwei.wang@nxp.com>
Link: https://lore.kernel.org/r/20240123165141.2008104-1-shenwei.wang@nxp.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Shenwei Wang 2024-01-23 10:51:41 -06:00 committed by Paolo Abeni
parent a2933a8759
commit 5e34480773
1 changed files with 2 additions and 0 deletions
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2
drivers/net/ethernet/freescale/fec_main.c
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@ -2036,6 +2036,7 @@ static void fec_enet_adjust_link(struct net_device *ndev)
/* if any of the above changed restart the FEC */
if (status_change) {
netif_stop_queue(ndev);
napi_disable(&fep->napi);
netif_tx_lock_bh(ndev);
fec_restart(ndev);
@ -2045,6 +2046,7 @@ static void fec_enet_adjust_link(struct net_device *ndev)
}
} else {
if (fep->link) {
netif_stop_queue(ndev);
napi_disable(&fep->napi);
netif_tx_lock_bh(ndev);
fec_stop(ndev);