Messages in this thread | | | From | Alexey Khoroshilov <> | Subject | Deadlock in pch_udc_svc_ur_interrupt() | Date | Mon, 28 Sep 2015 16:12:33 +0400 |
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Dear colleagus,
It seems code handling USB_RESET interrupt contains unavoidable deadlock.
pch_udc_isr() locks dev->lock, then calls to pch_udc_dev_isr(dev, dev_intr) that seems to have a couple of locks dev->lock itself:
pch_udc_isr() spin_lock(&dev->lock); pch_udc_dev_isr(dev, dev_intr); pch_udc_svc_ur_interrupt(dev); empty_req_queue(ep); complete_req(ep, req, -ESHUTDOWN); spin_lock(&dev->lock); <--- deadlock if (dev->driver) { spin_lock(&dev->lock); } <--- deadlock
Found by Linux Driver Verification project (linuxtesting.org).
-- Alexey Khoroshilov Linux Verification Center, ISPRAS web: http://linuxtesting.org
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