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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
@@ -952,6 +952,7 @@ 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);
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