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/freebsd-9.3-release/sys/cam/ata/
H A Data_pmp.cdiff 251096 Wed May 29 02:30:18 MDT 2013 mav MFC r250508:
Disable sending Early R_OK on SiI3726/SiI3826 port multipliers.
With "cached read" HDD testing and multiple ports busy on a SATA
host controller, 3726/3826 PMP will very rarely drop a deferred
R_OK that was intended for the host. Symptom will be all 5 drives
under test will timeout, get reset, and recover.

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