netdev - Re: [PATCH iwl-net v2] idpf: check error for register

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Message-ID: <20250217161703.GO1615191@kernel.org>
Date: Mon, 17 Feb 2025 16:17:03 +0000
From: Simon Horman <horms@...nel.org>
To: Emil Tantilov <emil.s.tantilov@...el.com>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	decot@...gle.com, willemb@...gle.com, anthony.l.nguyen@...el.com,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, madhu.chittim@...el.com,
	przemyslaw.kitszel@...el.com
Subject: Re: [PATCH iwl-net v2] idpf: check error for register_netdev() on
 init

On Fri, Feb 14, 2025 at 09:18:16AM -0800, Emil Tantilov wrote:
> 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@...el.com>
> Signed-off-by: Emil Tantilov <emil.s.tantilov@...el.com>
> ---
> Changelog:
> v2:
> - Refactored a bit to avoid >80 char lines.
> - Changed the netdev and flag check to allow for early continue in the
>   max_vports loop, which also helps to reduce the identation.
> 
> v1:
> https://lore.kernel.org/intel-wired-lan/20250211023851.21090-1-emil.s.tantilov@intel.com/

Thanks for the update.

Reviewed-by: Simon Horman <horms@...nel.org>