linux-kernel - Re: [PATCH] libata: limit post SRST nsect/lbal wait to ~100ms

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Message-ID: <466C256C.9040509@garzik.org>
Date:	Sun, 10 Jun 2007 12:23:08 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Tejun Heo <htejun@...il.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Gregor Jasny <gjasny@...glemail.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] libata: limit post SRST nsect/lbal wait to ~100ms

Tejun Heo wrote:
> After SRST, libata used to wait for nsect/lbal to be set to 1/1 for
> the slave device.  However, some ATAPI devices don't set nsect/lbal
> after SRST and the wait itself isn't too useful as we're gonna wait
> for !BSY right after that anyway.
> 
> Before reset-seq update, nsect/lbal wait failure used to be ignored
> and caused 30sec delay during detection.  After reset-seq, all
> timeouts are considered error conditions making libata fail to detect
> such ATAPI devices.
> 
> This patch limits nsect/lbal wait to around 100ms.  This should give
> acceptable behavior to such ATAPI devices while not disturbing the
> heavily used code path too much.
> 
> Signed-off-by: Tejun Heo <htejun@...il.com>
> ---
> Okay, here it is.  Sorry for the delay.
> 
>  drivers/ata/libata-core.c |   32 +++++++++++++++++++-------------
>  1 file changed, 19 insertions(+), 13 deletions(-)

Thanks.  Maybe Gregor can confirm this fixes his problem?

I'll ACK and push upstream then...


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