linux-kernel - RE: [PATCH] [SCSI] LIBSAS: fix libsas link error issue

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Message-ID: <F766E4F80769BD478052FB6533FA745D19FAE66CCA@SC-VEXCH4.marvell.com>
Date:	Wed, 15 Jun 2011 19:29:18 -0700
From:	Xiangliang Yu <yuxiangl@...vell.com>
To:	Jack Wang <jack_wang@...sh.com>,
	'James Bottomley' <James.Bottomley@...senPartnership.com>
CC:	"yxlraid@...il.com" <yxlraid@...il.com>,
	"lucas.demarchi@...fusion.mobi" <lucas.demarchi@...fusion.mobi>,
	"maciej.trela@...el.com" <maciej.trela@...el.com>,
	"dan.j.williams@...el.com" <dan.j.williams@...el.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jacky Feng <jfeng@...vell.com>
Subject: RE: [PATCH] [SCSI] LIBSAS: fix libsas link error issue

> [Jack Wang] 
>It's the same, sas_ex_get_linkrate use DISCOVER response as linkrate.
But the function have problem, actually, the error statement is:
child->linkrate = min(parent_phy->linkrate, child->max_linkrate); 
its mean like this:
child->linkrate = min(child_phy->linkrate, max(parent->max_linkrate,child_phy->linkrate));
and if parent->max_linkrate(3Gbps) is less than child_phy->linkrate(6Gbps),
the statement will be change this:
child->linkrate = child_phy->linkrate, forget the parent linkrate.

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