[PATCH v3 0/1] Fix race condition in throttle_group_restart_queue()

[Alberto Garcia <berto@igalia.com>]

Hi,

In the previous patch I forgot to relax the assertion for case 2.

If we're restarting the queue when another tgm has a timer armed I
don't think we can guarantee that when the timer fires it won't set a
new timer on our own tgm before we reach the assertion.

I think that the assertion should depend on reset_timer_armed:

- If it's true, no one else can arm a timer so the assertion holds.
- If it's false, it is possible for the other tgm to arm our timer.
  The assertion would fail in this case, but I think it's harmless
  because even if it would fire at the same time the logic in
  throttle_group_restart_queue_entry() is protected by the lock.

Berto

Alberto Garcia (1):
  throttle-group: Fix race condition in throttle_group_restart_queue()

 block/throttle-groups.c | 79 +++++++++++++++++++++++++++++++----------
 1 file changed, 60 insertions(+), 19 deletions(-)

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2.47.3