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To: linux-kernel@vger.kernel.org
From: Matthias Urlichs <smurf@smurf.noris.de>
Subject: Call chain analysis
Date: Wed, 30 Mar 2005 15:04:28 +0200
Organization: {M:U} IT-Consulting
Message-ID: <pan.2005.03.30.13.04.25.128572@smurf.noris.de>
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Hi,

I'm running into an IRQ problem while removing USB adapters (e.g., when
pulling a PCMCIA card with an OHCI on it).

Specifically, this call chain
  usb_hcd_pci_remove -> hcd_buffer_destroy -> dma_pool_destroy
    -> pool_free_page -> free_hot_cold_page -> IRQ -> usb_hcd_irq
results in a crash. That's not the immediate problem, though.

The problem is that wrapping usb_hcd_pci_remove() in a local_irq_save/
/restore *still* allows that interrupt to happen. I suspect that something
in that call chain sometimes calls the scheduler ..?

I assume that there are nice tools which find that call for me, and save
me from plowing through a lot of kernel code ..? I've never needed one of
those before. :-/

-- 
Matthias Urlichs   |   {M:U} IT Design @ m-u-it.de   |  smurf@smurf.noris.de


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