K 10
svn:author
V 6
emaste
K 8
svn:date
V 27
2012-02-13T01:44:12.966580Z
K 7
svn:log
V 709
Fix panic after "WARNING - ATA_IDENTIFY taskqueue timeout"

When performing a firmware upgrade via atacontrol[1] the subsequent
command may time out producing the error message above.  When this
happens the callout could still be active, and the system would then
panic due to a destroyed semaphore.

Instead, ensure that the callout is done first, via callout_drain.

Note that this fix applies to the "old" ata(4) and so isn't applicable
to the default configuration in HEAD.  It is still applicable to
stable/8.

[1] http://lists.freebsd.org/pipermail/freebsd-current/2012-January/031122.html

Submitted by:   Nima Misaghian
Reviewed by:    rstone, attilio, mav
Obtained from:  SVOS
MFC after:      3 days

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