linux-kernel - [PATCH] usb: dwc3: Fix lock-up on ID change during system suspend/resume

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Date:   Tue, 27 Feb 2018 12:41:41 +0200
From:   Roger Quadros <rogerq@...com>
To:     <balbi@...nel.org>
CC:     <gregkh@...uxfoundation.org>, <mgautam@...eaurora.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Roger Quadros <rogerq@...com>,
        "# v4 . 12+" <stable@...r.kernel.org>
Subject: [PATCH] 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@...r.kernel.org> # v4.12+
Suggested-by: Manu Gautam <mgautam@...eaurora.org>
Signed-off-by: Roger Quadros <rogerq@...com>
---
 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 f1d838a..e94bf91 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)
-- 
cheers,
-roger

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