Commit 084a804e authored Feb 27, 2018 by Roger Quadros Committed by Felipe Balbi Feb 28, 2018

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: 41ce1456 ("usb: dwc3: core: make dwc3_set_mode() work properly")
Cc: <stable@vger.kernel.org> # v4.12+
Suggested-by: Manu Gautam <mgautam@codeaurora.org>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

parent 4a3928c6

drivers/usb/dwc3/core.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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)

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