5.4-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 9bd9c8026341f75f25c53104eb7e656e357ca1a2 upstream.
Delayed work that prevents USB3 hubs from runtime-suspending too early needed to be flushed in hub_quiesce() to resolve issues detected on QC SC8280XP CRD board during suspend resume testing.
This flushing did however trigger new issues on Raspberry Pi 3B+, which doesn't have USB3 ports, and doesn't queue any post resume delayed work.
The flushed 'hub->init_work' item is used for several purposes, and is originally initialized with a 'NULL' work function. The work function is also changed on the fly, which may contribute to the issue.
Solve this by creating a dedicated delayed work item for post resume work, and flush that delayed work in hub_quiesce()
Cc: stable stable@kernel.org Fixes: a49e1e2e785f ("usb: hub: Fix flushing and scheduling of delayed work that tunes runtime pm") Reported-by: Mark Brown broonie@kernel.org Closes: https://lore.kernel.org/linux-usb/aF5rNp1l0LWITnEB@finisterre.sirena.org.uk Signed-off-by: Mathias Nyman mathias.nyman@linux.intel.com Tested-by: Konrad Dybcio konrad.dybcio@oss.qualcomm.com # SC8280XP CRD Tested-by: Mark Brown broonie@kernel.org Link: https://lore.kernel.org/r/20250627164348.3982628-2-mathias.nyman@linux.intel... [florian: adjust for lack of hub_{get,put} and timer_delete_sync] Signed-off-by: Florian Fainelli florian.fainelli@broadcom.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/core/hub.c | 21 ++++++++------------- drivers/usb/core/hub.h | 1 + 2 files changed, 9 insertions(+), 13 deletions(-)
--- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -1030,12 +1030,11 @@ int usb_remove_device(struct usb_device
enum hub_activation_type { HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ - HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, HUB_POST_RESUME, + HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, };
static void hub_init_func2(struct work_struct *ws); static void hub_init_func3(struct work_struct *ws); -static void hub_post_resume(struct work_struct *ws);
static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) { @@ -1059,12 +1058,6 @@ static void hub_activate(struct usb_hub goto init3; }
- if (type == HUB_POST_RESUME) { - usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); - kref_put(&hub->kref, hub_release); - return; - } - kref_get(&hub->kref);
/* The superspeed hub except for root hub has to use Hub Depth @@ -1318,8 +1311,8 @@ static void hub_activate(struct usb_hub 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, + queue_delayed_work(system_power_efficient_wq, + &hub->post_resume_work, msecs_to_jiffies(USB_SS_PORT_U0_WAKE_TIME)); return; } @@ -1344,9 +1337,10 @@ static void hub_init_func3(struct work_s
static void hub_post_resume(struct work_struct *ws) { - struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); + struct usb_hub *hub = container_of(ws, struct usb_hub, post_resume_work.work);
- hub_activate(hub, HUB_POST_RESUME); + usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); + kref_put(&hub->kref, hub_release); }
enum hub_quiescing_type { @@ -1374,7 +1368,7 @@ static void hub_quiesce(struct usb_hub *
/* Stop hub_wq and related activity */ del_timer_sync(&hub->irq_urb_retry); - flush_delayed_work(&hub->init_work); + flush_delayed_work(&hub->post_resume_work); usb_kill_urb(hub->urb); if (hub->has_indicators) cancel_delayed_work_sync(&hub->leds); @@ -1921,6 +1915,7 @@ static int hub_probe(struct usb_interfac hub->hdev = hdev; INIT_DELAYED_WORK(&hub->leds, led_work); INIT_DELAYED_WORK(&hub->init_work, NULL); + INIT_DELAYED_WORK(&hub->post_resume_work, hub_post_resume); INIT_WORK(&hub->events, hub_event); spin_lock_init(&hub->irq_urb_lock); timer_setup(&hub->irq_urb_retry, hub_retry_irq_urb, 0); --- a/drivers/usb/core/hub.h +++ b/drivers/usb/core/hub.h @@ -69,6 +69,7 @@ struct usb_hub { u8 indicator[USB_MAXCHILDREN]; struct delayed_work leds; struct delayed_work init_work; + struct delayed_work post_resume_work; struct work_struct events; spinlock_t irq_urb_lock; struct timer_list irq_urb_retry;