scsi: lpfc: Fix hard lockup when reading the rx_monitor from debugfs

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

scsi: lpfc: Fix hard lockup when reading the rx_monitor from debugfs

During I/O and simultaneous cat of /sys/kernel/debug/lpfc/fnX/rx_monitor, a

hard lockup similar to the call trace below may occur.

The spin_lock_bh in lpfc_rx_monitor_report is not protecting from timer

interrupts as expected, so change the strength of the spin lock to _irq.

Kernel panic - not syncing: Hard LOCKUP

CPU: 3 PID: 110402 Comm: cat Kdump: loaded

exception RIP: native_queued_spin_lock_slowpath+91

[IRQ stack]

native_queued_spin_lock_slowpath at ffffffffb814e30b

_raw_spin_lock at ffffffffb89a667a

lpfc_rx_monitor_record at ffffffffc0a73a36 [lpfc]

lpfc_cmf_timer at ffffffffc0abbc67 [lpfc]

__hrtimer_run_queues at ffffffffb8184250

hrtimer_interrupt at ffffffffb8184ab0

smp_apic_timer_interrupt at ffffffffb8a026ba

apic_timer_interrupt at ffffffffb8a01c4f

[End of IRQ stack]

apic_timer_interrupt at ffffffffb8a01c4f

lpfc_rx_monitor_report at ffffffffc0a73c80 [lpfc]

lpfc_rx_monitor_read at ffffffffc0addde1 [lpfc]

full_proxy_read at ffffffffb83e7fc3

vfs_read at ffffffffb833fe71

ksys_read at ffffffffb83402af

do_syscall_64 at ffffffffb800430b

entry_SYSCALL_64_after_hwframe at ffffffffb8a000ad