linux-kernel - RE: fixed a bug of adma in rhel4u5 with HDS7250SASUN500G.

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Date:	Thu, 24 Jan 2008 11:20:51 +0800
From:	"Kuan Luo" <kluo@...dia.com>
To:	"Robert Hancock" <hancockr@...w.ca>,
	"Allen Martin" <AMartin@...dia.com>
Cc:	"Tejun Heo" <htejun@...il.com>, "Mark Lord" <liml@....ca>,
	"Jeff Garzik" <jeff@...zik.org>,
	"IDE/ATA development list" <linux-ide@...r.kernel.org>,
	"Peer Chen" <pchen@...dia.com>,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"David Milburn" <dmilburn@...hat.com>
Subject: RE: fixed a bug of adma in rhel4u5 with HDS7250SASUN500G.

Robert worte.
> 
> Kuan, does this patch (using the notifiers to see if the command is 
> really done) still work if one port on the controller has 
> ADMA disabled 
> because it's in ATAPI mode? I seem to recall Allen Martin mentioning 
> that notifiers wouldn't work in this case.
> 

I just tried the 2.6.24-rc7 sata_nv driver with one hd and  one cdrom in
the same controller. 
I mkfs hd and mounted the cdrom and no error happened.

Allen,  is there anything about notifier that we should pay attention
to?

> 
> > 
> > * it sure seems like there are other open sata_nv ADMA 
> issues -- can we 
> > hard-confirm or deny this?  bugzilla wasn't very helpful 
> for me.  It 
> > doesn't seem like we can disable ADMA (to solve those 
> issues) and get 
> > enough test time in (which is what I said a week (or more?) 
> ago too...)
> 
> The NCQ/non-NCQ command switching issue is still hitting some people 
> (last I heard Kuan was looking into this), also there's a 
> hotplug issue 
> that Tejun reported..
> 
I have not yet reproduced the switching issue even if i removed the
udelay function according to your metholds.
I tried the 2.6.24-rc7. 
 I don't know what kernel version can easily reproduce the issue or
mabye i omit some steps during test.

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