net/mlx5: Fix double unregister of HCA_PORTS component

In the Linux kernel, the following vulnerability has been resolved:

net/mlx5: Fix double unregister of HCA_PORTS component

Clear hca_devcom_comp in device's private data after unregistering it in

LAG teardown. Otherwise a slightly lagging second pass through

mlx5_unload_one() might try to unregister it again and trip over

use-after-free.

On s390 almost all PCI level recovery events trigger two passes through

mxl5_unload_one() - one through the poll_health() method and one through

mlx5_pci_err_detected() as callback from generic PCI error recovery.

While testing PCI error recovery paths with more kernel debug features

enabled, this issue reproducibly led to kernel panics with the following

call chain:

Unable to handle kernel pointer dereference in virtual kernel address space

Failing address: 6b6b6b6b6b6b6000 TEID: 6b6b6b6b6b6b6803 ESOP-2 FSI

Fault in home space mode while using kernel ASCE.

AS:00000000705c4007 R3:0000000000000024

Oops: 0038 ilc:3 [#1]SMP

CPU: 14 UID: 0 PID: 156 Comm: kmcheck Kdump: loaded Not tainted

6.18.0-20251130.rc7.git0.16131a59cab1.300.fc43.s390x+debug #1 PREEMPT

Krnl PSW : 0404e00180000000 0000020fc86aa1dc (__lock_acquire+0x5c/0x15f0)

R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3

Krnl GPRS: 0000000000000000 0000020f00000001 6b6b6b6b6b6b6c33 0000000000000000

0000000000000000 0000000000000000 0000000000000001 0000000000000000

0000000000000000 0000020fca28b820 0000000000000000 0000010a1ced8100

0000010a1ced8100 0000020fc9775068 0000018fce14f8b8 0000018fce14f7f8

Krnl Code: 0000020fc86aa1cc: e3b003400004 lg %r11,832

0000020fc86aa1d2: a7840211 brc 8,0000020fc86aa5f4

*0000020fc86aa1d6: c09000df0b25 larl %r9,0000020fca28b820

>0000020fc86aa1dc: d50790002000 clc 0(8,%r9),0(%r2)

0000020fc86aa1e2: a7840209 brc 8,0000020fc86aa5f4

0000020fc86aa1e6: c0e001100401 larl %r14,0000020fca8aa9e8

0000020fc86aa1ec: c01000e25a00 larl %r1,0000020fca2f55ec

0000020fc86aa1f2: a7eb00e8 aghi %r14,232

Call Trace:

__lock_acquire+0x5c/0x15f0

lock_acquire.part.0+0xf8/0x270

lock_acquire+0xb0/0x1b0

down_write+0x5a/0x250

mlx5_detach_device+0x42/0x110 [mlx5_core]

mlx5_unload_one_devl_locked+0x50/0xc0 [mlx5_core]

mlx5_unload_one+0x42/0x60 [mlx5_core]

mlx5_pci_err_detected+0x94/0x150 [mlx5_core]

zpci_event_attempt_error_recovery+0xcc/0x388