pwr-mlxbf: Several bug fixes for focal

[Asmaa Mnebhi]

SRU Justification:

[Impact]

There is are several changes that needs to be made to pwr-mlxbf in focal:
* There is a race condition between gpio-mlxbf2.c driver being loaded and pwr-mlxbf.c being loaded
* When the module is removed, there is a panic due to NULL pointer access
* soft reset needs to be replaced by graceful reboot

[Fix]

* Fix race condition between gpio-mlxbf2.c driver being loaded and pwr-mlxbf.c being loaded
* Fix panic due to access to NULL pointer when driver is removed via rmmod
* support graceful reboot instead of soft reset

[Test Case]

* all test cases are for BF2:
* trigger the gpio toggling from the BMC: ipmitool raw 0x32 0xA1 0x02
  This should trigger a graceful reboot of the DPU.
* rmmod/modprobe
* reboot test and make sure the driver is always loaded

[Regression Potential]

* Run the 100 reboot test and make sure that the driver is loaded with no issues. That the gpio graceful reboot works.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux-bluefield/5.4.0-1076.82 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-focal-linux-bluefield' to 'verification-done-focal-linux-bluefield'. If the problem still exists, change the tag 'verification-needed-focal-linux-bluefield' to 'verification-failed-focal-linux-bluefield'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-bluefield - 5.4.0-1076.82

---------------
linux-bluefield (5.4.0-1076.82) focal; urgency=medium

  * focal/linux-bluefield: 5.4.0-1076.82 -proposed tracker (LP: #2041621)

  * pwr-mlxbf: Several bug fixes for focal (LP: #2041996)
    - SAUCE: Fix race condition between loading pwr-mlxbf.c and gpio-mlxbf2.c
      drivers
    - SAUCE: pwr-mlxbf.c: rmmod results in kernel panic due to access to NULL
      pointer
    - SAUCE: pwr-mlxbf: support graceful reboot instead of soft reset

  [ Ubuntu: 5.4.0-169.187 ]

  * focal/linux: 5.4.0-169.187 -proposed tracker (LP: #2044375)
  * USB bus error after upgrading to proposed kernel on lunar, jammy and focal
    (LP: #2043197)
    - USB: core: Fix oversight in SuperSpeed initialization
  * Packaging resync (LP: #1786013)
    - [Packaging] resync git-ubuntu-log
    - [Packaging] resync update-dkms-versions helper
    - [Packaging] update annotations scripts

  [ Ubuntu: 5.4.0-168.186 ]

  * focal/linux: 5.4.0-168.186 -proposed tracker (LP: #2041652)
  * Focal update: v5.4.257 upstream stable release (LP: #2040284)
    - erofs: ensure that the post-EOF tails are all zeroed
    - ARM: pxa: remove use of symbol_get()
    - mmc: au1xmmc: force non-modular build and remove symbol_get usage
    - net: enetc: use EXPORT_SYMBOL_GPL for enetc_phc_index
    - rtc: ds1685: use EXPORT_SYMBOL_GPL for ds1685_rtc_poweroff
    - modules: only allow symbol_get of EXPORT_SYMBOL_GPL modules
    - USB: serial: option: add Quectel EM05G variant (0x030e)
    - USB: serial: option: add FOXCONN T99W368/T99W373 product
    - HID: wacom: remove the battery when the EKR is off
    - staging: rtl8712: fix race condition
    - Bluetooth: btsdio: fix use after free bug in btsdio_remove due to race
      condition
    - serial: sc16is7xx: fix bug when first setting GPIO direction
    - firmware: stratix10-svc: Fix an NULL vs IS_ERR() bug in probe
    - fsi: master-ast-cf: Add MODULE_FIRMWARE macro
    - nilfs2: fix general protection fault in nilfs_lookup_dirty_data_buffers()
    - nilfs2: fix WARNING in mark_buffer_dirty due to discarded buffer reuse
    - pinctrl: amd: Don't show `Invalid config param` errors
    - 9p: virtio: make sure 'offs' is initialized in zc_request
    - ASoC: da7219: Flush pending AAD IRQ when suspending
    - ASoC: da7219: Check for failure reading AAD IRQ events
    - ethernet: atheros: fix return value check in atl1c_tso_csum()
    - vxlan: generalize vxlan_parse_gpe_hdr and remove unused args
    - m68k: Fix invalid .section syntax
    - s390/dasd: use correct number of retries for ERP requests
    - s390/dasd: fix hanging device after request requeue
    - fs/nls: make load_nls() take a const parameter
    - ASoc: codecs: ES8316: Fix DMIC config
    - ASoC: atmel: Fix the 8K sample parameter in I2SC master
    - platform/x86: intel: hid: Always call BTNL ACPI method
    - platform/x86: huawei-wmi: Silence ambient light sensor
    - security: keys: perform capable check only on privileged operations
    - clk: fixed-mmio: make COMMON_CLK_FIXED_MMIO depend on HAS_IOMEM
    - net: usb: qmi_wwan: add Quectel EM05GV2
    - idmaengine: make FSL_EDMA and INTEL_IDMA64 d...