[PATCH AUTOSEL 6.17-5.15] nvmet-fc: avoid scheduling association deletion twice

[Sasha Levin]

On Fri, Oct 10, 2025 at 09:39:05AM +0200, Daniel Wagner wrote:
>Hi Sasha,
>
>On Thu, Oct 09, 2025 at 11:54:41AM -0400, Sasha Levin wrote:
>> From: Daniel Wagner <wagi at kernel.org>
>>
>> [ Upstream commit f2537be4f8421f6495edfa0bc284d722f253841d ]
>>
>> When forcefully shutting down a port via the configfs interface,
>> nvmet_port_subsys_drop_link() first calls nvmet_port_del_ctrls() and
>> then nvmet_disable_port(). Both functions will eventually schedule all
>> remaining associations for deletion.
>>
>> The current implementation checks whether an association is about to be
>> removed, but only after the work item has already been scheduled. As a
>> result, it is possible for the first scheduled work item to free all
>> resources, and then for the same work item to be scheduled again for
>> deletion.
>>
>> Because the association list is an RCU list, it is not possible to take
>> a lock and remove the list entry directly, so it cannot be looked up
>> again. Instead, a flag (terminating) must be used to determine whether
>> the association is already in the process of being deleted.
>>
>> Reported-by: Shinichiro Kawasaki <shinichiro.kawasaki at wdc.com>
>> Closes: https://lore.kernel.org/all/rsdinhafrtlguauhesmrrzkybpnvwantwmyfq2ih5aregghax5@mhr7v3eryci3/
>> Reviewed-by: Hannes Reinecke <hare at suse.de>
>> Signed-off-by: Daniel Wagner <wagi at kernel.org>
>> Signed-off-by: Keith Busch <kbusch at kernel.org>
>> Signed-off-by: Sasha Levin <sashal at kernel.org>
>
>This patch is part of a whole series:
>
>https://lore.kernel.org/all/20250902-fix-nvmet-fc-v3-0-1ae1ecb798d8@kernel.org/
>
>IMO, all should all be backported:
>
>db5a5406fb7e nvmet-fc: move lsop put work to nvmet_fc_ls_req_op
>f2537be4f842 nvmet-fc: avoid scheduling association deletion twice
>10c165af35d2 nvmet-fcloop: call done callback even when remote port is gone
>891cdbb162cc nvme-fc: use lock accessing port_state and rport state

Ack, thanks!

-- 
Thanks,
Sasha