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net: stmmac: Disable Tx queues when reconfiguring the interface

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The Tx queues were not disabled in situations where the driver needed to
stop the interface to apply a new configuration. This could result in a
kernel panic when doing any of the 3 following actions:
* reconfiguring the number of queues (ethtool -L)
* reconfiguring the size of the ring buffers (ethtool -G)
* installing/removing an XDP program (ip l set dev ethX xdp)

Prevent the panic by making sure netif_tx_disable is called when stopping
an interface.

Without this patch, the following kernel panic can be observed when doing
any of the actions above:

Unable to handle kernel paging request at virtual address ffff80001238d040
[....]
 Call trace:
  dwmac4_set_addr+0x8/0x10
  dev_hard_start_xmit+0xe4/0x1ac
  sch_direct_xmit+0xe8/0x39c
  __dev_queue_xmit+0x3ec/0xaf0
  dev_queue_xmit+0x14/0x20
[...]
[ end trace 0000000000000002 ]---

Fixes: 5fabb01207 ("net: stmmac: Add initial XDP support")
Fixes: aa042f60e4 ("net: stmmac: Add support to Ethtool get/set ring parameters")
Fixes: 0366f7e06a ("net: stmmac: add ethtool support for get/set channels")
Signed-off-by: Yannick Vignon <yannick.vignon@nxp.com>
Link: https://lore.kernel.org/r/20211124154731.1676949-1-yannick.vignon@oss.nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Yannick Vignon 2021-11-24 16:47:31 +01:00 committed by Jakub Kicinski
parent 49573ff783
commit b270bfe697
1 changed files with 2 additions and 0 deletions
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2
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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@ -3802,6 +3802,8 @@ int stmmac_release(struct net_device *dev)
struct stmmac_priv *priv = netdev_priv(dev);
u32 chan;
netif_tx_disable(dev);
if (device_may_wakeup(priv->device))
phylink_speed_down(priv->phylink, false);
/* Stop and disconnect the PHY */