Public bug reported:
[ Impact ]
On a certain Dell all-in-one (AIO) platform, we observed a system-hang
issue when the system resumed from suspend. This is introduced by the
fix [1] from #2115478 -- a delayed_work is introduced in the
drivers/usb/core/hub.c. But in this patch, the driver doesn't flush the
delayed_work when the system is going to suspend, causing it to be
called right after the system resume, which is an uncertain behavior.
[ Fix ]
The author had launched two fixes [2][3], which fixes the problem
introduced by the original fix [1].
These two fixes have already landed on mainline:
1. a49e1e2e785fb362 usb: hub: Fix flushing and scheduling of delayed work that
tunes runtime pm
2. 9bd9c8026341f75f usb: hub: Fix flushing of delayed work used for post resume
purposes
[ Test ]
1. Boot into the Ubuntu OEM-6.14 kernel
2. Suspend the system by running $ sudo systemctl suspend
3. Wake the system up by pressing any key on a keyboard
4. Check whether the system hangs after resuming from suspend
[ Where problems could occurs ]
These two fixes [2][3] resolve the issue caused by the original fix [1]. It is
unlikely to cause regression since these two fixes are quite small.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux-oem-6.14 (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux (Ubuntu Noble)
Importance: Undecided
Status: Invalid
** Affects: linux-oem-6.14 (Ubuntu Noble)
Importance: Undecided
Assignee: En-Wei Wu (rickywu)
Status: New
** Also affects: linux-oem-6.14 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Noble)
Importance: Undecided
Status: New
** Also affects: linux-oem-6.14 (Ubuntu Noble)
Importance: Undecided
Status: New
** Changed in: linux-oem-6.14 (Ubuntu Noble)
Assignee: (unassigned) => En-Wei Wu (rickywu)
** Changed in: linux (Ubuntu)
Status: New => Invalid
** Changed in: linux (Ubuntu Noble)
Status: New => Invalid
** Changed in: linux-oem-6.14 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2117224
Title:
[USB Hub] Fix hanging issue when resume from suspend on a Dell AIO
platform
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