Andy Shevchenko 72bd750d11 mfd: intel-lpss: Fix too early PM enablement in the ACPI ->probe()
commit c9e143084d1a602f829115612e1ec79df3727c8b upstream.

The runtime PM callback may be called as soon as the runtime PM facility
is enabled and activated. It means that ->suspend() may be called before
we finish probing the device in the ACPI case. Hence, NULL pointer
dereference:

  intel-lpss INT34BA:00: IRQ index 0 not found
  BUG: kernel NULL pointer dereference, address: 0000000000000030
  ...
  Workqueue: pm pm_runtime_work
  RIP: 0010:intel_lpss_suspend+0xb/0x40 [intel_lpss]

To fix this, first try to register the device and only after that enable
runtime PM facility.

Fixes: 4b45efe85263 ("mfd: Add support for Intel Sunrisepoint LPSS devices")
Reported-by: Orlando Chamberlain <redecorating@protonmail.com>
Reported-by: Aditya Garg <gargaditya08@live.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Aditya Garg <gargaditya08@live.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20211101190008.86473-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-01-16 09:12:44 +01:00
..
2021-09-07 12:38:59 -07:00
2019-07-02 12:11:31 +01:00
2019-07-15 20:18:40 -07:00
2021-09-07 12:38:59 -07:00
2021-03-10 10:58:33 +00:00
2021-06-15 13:02:53 +01:00
2019-07-09 08:59:39 -07:00