1 files changed, 58 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-5.4/701-net-0237-enetc-Remove-mdio-bus-on-PF-probe-error-path.patch b/target/linux/layerscape/patches-5.4/701-net-0237-enetc-Remove-mdio-bus-on-PF-probe-error-path.patch
new file mode 100644
index 0000000000..e3d36978d4
--- /dev/null
+++ b/target/linux/layerscape/patches-5.4/701-net-0237-enetc-Remove-mdio-bus-on-PF-probe-error-path.patch
@@ -0,0 +1,58 @@
+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);