6.15-stable review patch. If anyone has any objections, please let me know.
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From: Mathias Nyman mathias.nyman@linux.intel.com
commit a49e1e2e785fb3621f2d748581881b23a364998a upstream.
Delayed work to prevent USB3 hubs from runtime-suspending immediately after resume was added in commit 8f5b7e2bec1c ("usb: hub: fix detection of high tier USB3 devices behind suspended hubs").
This delayed work needs be flushed if system suspends, or hub needs to be quiesced for other reasons right after resume. Not flushing it triggered issues on QC SC8280XP CRD board during suspend/resume testing.
Fix it by flushing the delayed resume work in hub_quiesce()
The delayed work item that allow hub runtime suspend is also scheduled just before calling autopm get. Alan pointed out there is a small risk that work is run before autopm get, which would call autopm put before get, and mess up the runtime pm usage order. Swap the order of work sheduling and calling autopm get to solve this.
Cc: stable stable@kernel.org Fixes: 8f5b7e2bec1c ("usb: hub: fix detection of high tier USB3 devices behind suspended hubs") Reported-by: Konrad Dybcio konrad.dybcio@oss.qualcomm.com Closes: https://lore.kernel.org/linux-usb/acaaa928-832c-48ca-b0ea-d202d5cd3d6c@oss.q... Reported-by: Alan Stern stern@rowland.harvard.edu Closes: https://lore.kernel.org/linux-usb/c73fbead-66d7-497a-8fa1-75ea4761090a@rowla... Signed-off-by: Mathias Nyman mathias.nyman@linux.intel.com Link: https://lore.kernel.org/r/20250626130102.3639861-2-mathias.nyman@linux.intel... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/core/hub.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -1359,11 +1359,12 @@ static void hub_activate(struct usb_hub
if (type == HUB_RESUME && hub_is_superspeed(hub->hdev)) { /* give usb3 downstream links training time after hub resume */ + usb_autopm_get_interface_no_resume( + to_usb_interface(hub->intfdev)); + INIT_DELAYED_WORK(&hub->init_work, hub_post_resume); queue_delayed_work(system_power_efficient_wq, &hub->init_work, msecs_to_jiffies(USB_SS_PORT_U0_WAKE_TIME)); - usb_autopm_get_interface_no_resume( - to_usb_interface(hub->intfdev)); return; }
@@ -1417,6 +1418,7 @@ static void hub_quiesce(struct usb_hub *
/* Stop hub_wq and related activity */ timer_delete_sync(&hub->irq_urb_retry); + flush_delayed_work(&hub->init_work); usb_kill_urb(hub->urb); if (hub->has_indicators) cancel_delayed_work_sync(&hub->leds);