[PATCH 6.12 219/244] idpf: check error for register_netdev() on init

Greg Kroah-Hartman
2026-03-31T16:55:30Z

From: Emil Tantilov <emil.s.tantilov@intel.com>

[ Upstream commit 680811c67906191b237bbafe7dabbbad64649b39 ]

Current init logic ignores the error code from register_netdev(),
which will cause WARN_ON() on attempt to unregister it, if there was one,
and there is no info for the user that the creation of the netdev failed.

WARNING: CPU: 89 PID: 6902 at net/core/dev.c:11512 unregister_netdevice_many_notify+0x211/0x1a10
...
[ 3707.563641] unregister_netdev+0x1c/0x30
[ 3707.563656] idpf_vport_dealloc+0x5cf/0xce0 [idpf]
[ 3707.563684] idpf_deinit_task+0xef/0x160 [idpf]
[ 3707.563712] idpf_vc_core_deinit+0x84/0x320 [idpf]
[ 3707.563739] idpf_remove+0xbf/0x780 [idpf]
[ 3707.563769] pci_device_remove+0xab/0x1e0
[ 3707.563786] device_release_driver_internal+0x371/0x530
[ 3707.563803] driver_detach+0xbf/0x180
[ 3707.563816] bus_remove_driver+0x11b/0x2a0
[ 3707.563829] pci_unregister_driver+0x2a/0x250

Introduce an error check and log the vport number and error code.
On removal make sure to check VPORT_REG_NETDEV flag prior to calling
unregister and free on the netdev.

Add local variables for idx, vport_config and netdev for readability.

Fixes: 0fe45467a104 ("idpf: add create vport and netdev configuration")
Suggested-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Tested-by: Samuel Salin <Samuel.salin@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
(cherry picked from commit 680811c67906191b237bbafe7dabbbad64649b39)
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/intel/idpf/idpf_lib.c | 31 ++++++++++++++++++++---------
1 file changed, 22 insertions(+), 9 deletions(-)

--- a/drivers/net/ethernet/intel/idpf/idpf_lib.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_lib.c
@@ -911,15 +911,19 @@ static int idpf_stop(struct net_device *
static void idpf_decfg_netdev(struct idpf_vport *vport)
{
struct idpf_adapter *adapter = vport->adapter;
+ u16 idx = vport->idx;

kfree(vport->rx_ptype_lkup);
vport->rx_ptype_lkup = NULL;

- unregister_netdev(vport->netdev);
- free_netdev(vport->netdev);
+ if (test_and_clear_bit(IDPF_VPORT_REG_NETDEV,
+ adapter->vport_config[idx]->flags)) {
+ unregister_netdev(vport->netdev);
+ free_netdev(vport->netdev);
+ }
vport->netdev = NULL;

- adapter->netdevs[vport->idx] = NULL;
+ adapter->netdevs[idx] = NULL;
}

/**
@@ -1541,13 +1545,22 @@ void idpf_init_task(struct work_struct *
}

for (index = 0; index < adapter->max_vports; index++) {
- if (adapter->netdevs[index] &&
- !test_bit(IDPF_VPORT_REG_NETDEV,
- adapter->vport_config[index]->flags)) {
- register_netdev(adapter->netdevs[index]);
- set_bit(IDPF_VPORT_REG_NETDEV,
- adapter->vport_config[index]->flags);
+ struct net_device *netdev = adapter->netdevs[index];
+ struct idpf_vport_config *vport_config;
+
+ vport_config = adapter->vport_config[index];
+
+ if (!netdev ||
+ test_bit(IDPF_VPORT_REG_NETDEV, vport_config->flags))
+ continue;
+
+ err = register_netdev(netdev);
+ if (err) {
+ dev_err(&pdev->dev, "failed to register netdev for vport %d: %pe\n",
+ index, ERR_PTR(err));
+ continue;
}
+ set_bit(IDPF_VPORT_REG_NETDEV, vport_config->flags);
}

/* As all the required vports are created, clear the reset flag