linux-kernel - Re: [PATCH 2/3] [SCSI] mvsas: fix shift in mvs_94xx_free_reg

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Date:	Tue, 06 Nov 2012 15:55:49 -0500
From:	Xi Wang <xi.wang@...il.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	Xiangliang Yu <yuxiangl@...vell.com>, linux-scsi@...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.

> 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.

- xi
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