Description: writeback: avoid use-after-free after removing device
References:
 https://bugzilla.redhat.com/show_bug.cgi?id=2258475
 https://patchwork.kernel.org/project/linux-mm/patch/20220801155034.3772543-1-khazhy@google.com/
Notes:
 carnil> Commit fixes 45a2966fd641 ("writeback: fix bandwidth estimate
 carnil> for spiky workload") in 5.15-rc1.
Bugs:
upstream: released (6.0-rc3) [f87904c075515f3e1d8f4a7115869d3b914674fd]
6.1-upstream-stable: N/A "Fixed before branching point"
5.10-upstream-stable: N/A "Vulnerable code not present"
4.19-upstream-stable: N/A "Vulnerable code not present"
sid: released (5.19.6-1)
6.1-bookworm-security: N/A "Fixed before branching point"
5.10-bullseye-security: N/A "Vulnerable code not present"
4.19-buster-security: N/A "Vulnerable code not present"