Re: [PATCH] Fix USB suspend/resume crasher

From: Benjamin Herrenschmidt
Date: Wed Nov 23 2005 - 20:36:51 EST

> Unfortunately with this patch the EHCI controller in my box (Asus L5D,
> x86-64 kernel) does not resume from suspend. Appended is the relevant
> snippet from the serial console log (EHCI is the only device using IRQ #5).

Hrm... let me see... You are getting an interrupt for EHCI after it has
been resumed, so it should work.

/me double-checks the patch

> ehci_hcd 0000:00:02.2: lost power, restarting

Hrm... I can't find that line in the code...

/me rechecks with david's other patches

Ah ... I see it. There might have been some screwup between david's
patch and mine.

Make sure that

set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);

Is still done before anything else in ehci_pci_resume(). It may be worth
following it with a memory barrier actually... just in case (due to the
absence of locks in that area).


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