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Message-ID: <F766E4F80769BD478052FB6533FA745D25EA5FB180@SC-VEXCH4.marvell.com>
Date: Thu, 8 Nov 2012 23:30:03 -0800
From: Xiangliang Yu <yuxiangl@...vell.com>
To: Xi Wang <xi.wang@...il.com>,
James Bottomley <James.Bottomley@...senPartnership.com>
CC: "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 2/3] [SCSI] mvsas: fix shift in mvs_94xx_free_reg_set()
> On 11/6/12 7:06 AM, James Bottomley wrote:
> >
> > Why is this necessary? As I read the reg set assignment code, it finds
> > a free bit in the 64 bit register and uses that ... which can never be
> > greater than 64 so there's no need for the check.
>
> This patch just tries to be more defensive for bit(reg_set) with a
> broken reg_set value. I agree with you that it's not that necessary.
Agree with James, and just need to do NOT operation one time
>
> > The other two look OK (probably redone as a single patch with a stable
> > tag), but I'd like the input of the mvs people since it seems with the
> > current code, we only use 32 bit regsets and probably hang if we go over
> > that. The bug fix is either to enable the full 64 if it works, or
> > possibly cap at 32 ... what works with all released devices?
>
> Thanks for reviewing. Yeah we'd better to wait for the input from
> the mvs people.
About patch 3, I check the ffz code and found it will check ~0 conditions.
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