This is a note to let you know that I've just added the patch titled
usb: dwc3: Fix lock-up on ID change during system suspend/resume
to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From 084a804e01205bcd74cd0849bc72cb5c88f8e648 Mon Sep 17 00:00:00 2001
From: Roger Quadros <rogerq@xxxxxx>
Date: Tue, 27 Feb 2018 12:41:41 +0200
Subject: usb: dwc3: Fix lock-up on ID change during system suspend/resume
To reproduce the lock up do the following
- connect otg host adapter and a USB device to the dual-role port
so that it is in host mode.
- suspend to mem.
- disconnect otg adapter.
- resume the system.
If we call dwc3_host_exit() before tasks are thawed
xhci_plat_remove() seems to lock up at the second usb_remove_hcd() call.
To work around this we queue the _dwc3_set_mode() work on
the system_freezable_wq.
Fixes: 41ce1456e1db ("usb: dwc3: core: make dwc3_set_mode() work properly")
Cc: <stable@xxxxxxxxxxxxxxx> # v4.12+
Suggested-by: Manu Gautam <mgautam@xxxxxxxxxxxxxx>
Signed-off-by: Roger Quadros <rogerq@xxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
---
drivers/usb/dwc3/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index f1d838a4acd6..e94bf91cc58a 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -175,7 +175,7 @@ void dwc3_set_mode(struct dwc3 *dwc, u32 mode)
dwc->desired_dr_role = mode;
spin_unlock_irqrestore(&dwc->lock, flags);
- queue_work(system_power_efficient_wq, &dwc->drd_work);
+ queue_work(system_freezable_wq, &dwc->drd_work);
}
u32 dwc3_core_fifo_space(struct dwc3_ep *dep, u8 type)
--
2.16.2