Public bug reported:

[Impact]
Kernel panic when doing rfkill block on Intel Bluetooth controller.

[Fix]
Ensure everything is stopped before calling the shutdown callback.

[Test] 
Keep pressing the airplane mode button. High chance that a kernel splat
is shown and Bluetooth becomes unusable.

[Where problems could occur]
The shutdown callback is used by other Bluetooth controller as well.
Logically, the patch is doing the correct thing by queiscing the device
before calling shutodwn. However, other Bluetooth drivers may depend
it to behave correctly.

** Affects: hwe-next
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu)
     Importance: Medium
         Status: Confirmed

** Affects: linux-oem-5.10 (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Affects: linux (Ubuntu Focal)
     Importance: Undecided
         Status: Won't Fix

** Affects: linux-oem-5.10 (Ubuntu Focal)
     Importance: Medium
         Status: Confirmed

** Affects: linux (Ubuntu Hirsute)
     Importance: Medium
         Status: Confirmed

** Affects: linux-oem-5.10 (Ubuntu Hirsute)
     Importance: Undecided
         Status: Invalid

** Affects: linux (Ubuntu Impish)
     Importance: Medium
         Status: Confirmed

** Affects: linux-oem-5.10 (Ubuntu Impish)
     Importance: Undecided
         Status: Invalid


** Tags: oem-priority originate-from-1927047 originate-from-1927181 
originate-from-1927185 stella

** Also affects: linux-oem-5.10 (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Hirsute)
   Importance: Undecided
       Status: New

** Also affects: linux-oem-5.10 (Ubuntu Hirsute)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Impish)
   Importance: Undecided
       Status: New

** Also affects: linux-oem-5.10 (Ubuntu Impish)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: linux-oem-5.10 (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: linux-oem-5.10 (Ubuntu Hirsute)
       Status: New => Invalid

** Changed in: linux-oem-5.10 (Ubuntu Impish)
       Status: New => Invalid

** Changed in: linux (Ubuntu Impish)
       Status: New => Confirmed

** Changed in: linux (Ubuntu Hirsute)
       Status: New => Confirmed

** Changed in: linux (Ubuntu Focal)
       Status: New => Won't Fix

** Changed in: linux-oem-5.10 (Ubuntu Focal)
       Status: New => Confirmed

** Changed in: linux (Ubuntu Hirsute)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu Impish)
   Importance: Undecided => Medium

** Changed in: linux-oem-5.10 (Ubuntu Focal)
   Importance: Undecided => Medium

** Tags added: oem-priority originate-from-1927047 stella

** Tags added: originate-from-1927185

** Tags added: originate-from-1927181

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https://bugs.launchpad.net/bugs/1928838

Title:
  Fix kernel panic on Intel Bluetooth

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