On 12/19/16 17:13, John Baldwin wrote:
On Monday, December 19, 2016 09:28:13 AM Hans Petter Selasky wrote:
Author: hselasky
Date: Mon Dec 19 09:28:12 2016
New Revision: 310242
URL: https://svnweb.freebsd.org/changeset/base/310242
Log:
Defer USB enumeration until the SI_SUB_KICK_SCHEDULER is executed to avoid
boot panics in conjunction with the recently added EARLY_AP_STARTUP feature.
The panics happen due to using kernel facilities like callouts too early.
Tested by: jhb @
MFC after: 1 week
As mentioned in the thread, the patches to usb_hub.c weren't needed and the
block
in usb_process.c can just be removed unconditionally since it should never
execute
in the non-EARLY_AP_STARTUP case.
Hi John,
The checks in usb_process.c are needed in case attaching a USB
controller fails for some unknown reason. Then there is a problem that
thread0 cannot wait/sleep for the process to exit, so that it doesn't
access freed memory. Did I miss anything?
--HPS
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