text: From 73204b342fbee1fd9364365c1213815cc715eee2 Mon Sep 17 00:00:00 2001
  From: Claudiu Manoil <claudiu.manoil@nxp.com>
  Date: Thu, 14 Nov 2019 16:22:39 +0200
  Subject: [PATCH] enetc: Remove mdio bus on PF probe error path
  
  Fixes following kernel panic on the probing error
  path, when pci=nomsi bootarg is used (which is
  not supporrted by the enetc dirver):
  
  fsl_enetc 0000:00:00.0: MSIX alloc failed
  ------------[ cut here ]------------
  kernel BUG at drivers/net/phy/mdio_bus.c:487!
  Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
  Modules linked in:
  Process swapper/0 (pid: 1, stack limit = 0x(____ptrval____))
  CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.19.68-00004-g85dc4876e6e6 #1
  Hardware name: LS1028A RDB Board (DT)
  pstate: 80000005 (Nzcv daif -PAN -UAO)
  pc : mdiobus_free+0x5c/0x60
  lr : _devm_mdiobus_free+0x20/0x30
  [...]
  Call trace:
   mdiobus_free+0x5c/0x60
   _devm_mdiobus_free+0x20/0x30
   release_nodes+0x148/0x238
   devres_release_all+0x3c/0x68
   really_probe+0x90/0x2a0
   driver_probe_device+0x5c/0x100
   __driver_attach+0xf0/0xf8
   bus_for_each_dev+0x84/0xd8
   driver_attach+0x30/0x40
   bus_add_driver+0x1c4/0x230
   driver_register+0x64/0x110
   __pci_register_driver+0x58/0x68
   enetc_pf_driver_init+0x28/0x30
   do_one_initcall+0x54/0x268
   kernel_init_freeable+0x2d0/0x37c
   kernel_init+0x18/0x118
   ret_from_fork+0x10/0x1c
  Code: 97e0dd79 f9400bf3 a8c27bfd d65f03c0 (d4210000)
  ---[ end trace 1e4e5729f059b773 ]---
  
  Fixes: ebfcb23d62ab ("enetc: Add ENETC PF level external MDIO support")
  Signed-off-by: Claudiu Manoil <claudiu.manoil@nxp.com>
  ---
   drivers/net/ethernet/freescale/enetc/enetc_pf.c | 1 +
   1 file changed, 1 insertion(+)
  
  --- a/drivers/net/ethernet/freescale/enetc/enetc_pf.c
  +++ b/drivers/net/ethernet/freescale/enetc/enetc_pf.c
  @@ -953,6 +953,7 @@ err_alloc_si_res:
   	si->ndev = NULL;
   	free_netdev(ndev);
   err_alloc_netdev:
  +	enetc_mdio_remove(pf);
   	enetc_of_put_phy(pf);
   err_map_pf_space:
   	enetc_pci_remove(pdev);
  