netdev - [PATCH net v2] ice: Unregister netdev and devlink

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Date: Mon, 19 Jun 2023 12:58:13 +0200
From: Petr Oros <poros@...hat.com>
To: netdev@...r.kernel.org
Cc: jesse.brandeburg@...el.com,
	anthony.l.nguyen@...el.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	michal.swiatkowski@...ux.intel.com,
	jacob.e.keller@...el.com,
	intel-wired-lan@...ts.osuosl.org,
	linux-kernel@...r.kernel.org,
	pmenzel@...gen.mpg.de
Subject: [PATCH net v2] ice: Unregister netdev and devlink_port only once

Since commit 6624e780a577fc ("ice: split ice_vsi_setup into smaller
functions") ice_vsi_release does things twice. There is unregister
netdev which is unregistered in ice_deinit_eth also.

It also unregisters the devlink_port twice which is also unregistered
in ice_deinit_eth(). This double deregistration is hidden because
devl_port_unregister ignores the return value of xa_erase.

[   68.642167] Call Trace:
[   68.650385]  ice_devlink_destroy_pf_port+0xe/0x20 [ice]
[   68.655656]  ice_vsi_release+0x445/0x690 [ice]
[   68.660147]  ice_deinit+0x99/0x280 [ice]
[   68.664117]  ice_remove+0x1b6/0x5c0 [ice]

[  171.103841] Call Trace:
[  171.109607]  ice_devlink_destroy_pf_port+0xf/0x20 [ice]
[  171.114841]  ice_remove+0x158/0x270 [ice]
[  171.118854]  pci_device_remove+0x3b/0xc0
[  171.122779]  device_release_driver_internal+0xc7/0x170
[  171.127912]  driver_detach+0x54/0x8c
[  171.131491]  bus_remove_driver+0x77/0xd1
[  171.135406]  pci_unregister_driver+0x2d/0xb0
[  171.139670]  ice_module_exit+0xc/0x55f [ice]

Fixes: 6624e780a577 ("ice: split ice_vsi_setup into smaller functions")
Signed-off-by: Petr Oros <poros@...hat.com>
---
v2: reword subject

v1: https://lore.kernel.org/netdev/20230619084948.360128-1-poros@redhat.com/
---
 drivers/net/ethernet/intel/ice/ice_lib.c | 27 ------------------------
 1 file changed, 27 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_lib.c b/drivers/net/ethernet/intel/ice/ice_lib.c
index 11ae0e41f518a1..284a1f0bfdb545 100644
--- a/drivers/net/ethernet/intel/ice/ice_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_lib.c
@@ -3272,39 +3272,12 @@ int ice_vsi_release(struct ice_vsi *vsi)
 		return -ENODEV;
 	pf = vsi->back;
 
-	/* do not unregister while driver is in the reset recovery pending
-	 * state. Since reset/rebuild happens through PF service task workqueue,
-	 * it's not a good idea to unregister netdev that is associated to the
-	 * PF that is running the work queue items currently. This is done to
-	 * avoid check_flush_dependency() warning on this wq
-	 */
-	if (vsi->netdev && !ice_is_reset_in_progress(pf->state) &&
-	    (test_bit(ICE_VSI_NETDEV_REGISTERED, vsi->state))) {
-		unregister_netdev(vsi->netdev);
-		clear_bit(ICE_VSI_NETDEV_REGISTERED, vsi->state);
-	}
-
-	if (vsi->type == ICE_VSI_PF)
-		ice_devlink_destroy_pf_port(pf);
-
 	if (test_bit(ICE_FLAG_RSS_ENA, pf->flags))
 		ice_rss_clean(vsi);
 
 	ice_vsi_close(vsi);
 	ice_vsi_decfg(vsi);
 
-	if (vsi->netdev) {
-		if (test_bit(ICE_VSI_NETDEV_REGISTERED, vsi->state)) {
-			unregister_netdev(vsi->netdev);
-			clear_bit(ICE_VSI_NETDEV_REGISTERED, vsi->state);
-		}
-		if (test_bit(ICE_VSI_NETDEV_ALLOCD, vsi->state)) {
-			free_netdev(vsi->netdev);
-			vsi->netdev = NULL;
-			clear_bit(ICE_VSI_NETDEV_ALLOCD, vsi->state);
-		}
-	}
-
 	/* retain SW VSI data structure since it is needed to unregister and
 	 * free VSI netdev when PF is not in reset recovery pending state,\
 	 * for ex: during rmmod.
-- 
2.41.0