usb: dwc3: Prevent indefinite sleep in _dwc3_set_mode during suspend/resume

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In the following test we get stuck by sleeping forever in _dwc3_set_mode()
after which dual-role switching doesn't work.

On dra7-evm's dual-role port,
- Load g_zero gadget driver and enumerate to host
- suspend to mem
- disconnect USB cable to host and connect otg cable with Pen drive in it.
- resume system
- we sleep indefinitely in _dwc3_set_mode due to.
  dwc3_gadget_exit()->usb_del_gadget_udc()->udc_stop()->
	dwc3_gadget_stop()->wait_event_lock_irq()

To fix this instead of waiting indefinitely with wait_event_lock_irq()
we use wait_event_interruptible_lock_irq_timeout() and print
and error message if there was a timeout.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

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Roger Quadros 2018-03-09 14:47:04 +02:00 • committed by Felipe Balbi

parent 365b7673c3

commit 498f0478ab

1 changed files with 20 additions and 3 deletions

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drivers/usb/dwc3/gadget.c

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