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From: Robert Hancock <hancockr@shaw.ca>
To: Bill Davidsen <davidsen@tmr.com>
Cc: Stephen.Clark@seclark.us, Patrick Ale <patrick.ale@gmail.com>,
	linux-kernel@vger.kernel.org
Subject: Re: hdparm for lib_pata
Date: Tue, 06 Feb 2007 17:45:22 -0600	[thread overview]
Message-ID: <45C91312.2030403@shaw.ca> (raw)
In-Reply-To: <45C8BE89.9000705@tmr.com>

Bill Davidsen wrote:
>> Support for that ioctl could likely be added, but these days I don't 
>> think there's much use for it. I can't see how anybody in their right 
>> mind would want to disable DMA on a modern drive, and if libata turns 
>> it off automatically then there's likely some serious hardware or 
>> driver problem that will end up biting you some other way if you force 
>> it back on.
>>
> I think deciding to turn off DMA which works fine in old kernels 
> qualifies as a "serious driver problem," which is why it should be under 
> user control.

Point is, if the DMA's not working such that the system decides to turn 
it off, it's obviously having some issues, and thus turning it back on 
without fixing the problem could cause problems or even cause data 
corruption.

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/


  parent reply	other threads:[~2007-02-06 23:46 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <fa.L/RjDlo6Njb5Jt7/9ENZuiASoV0@ifi.uio.no>
2007-02-03 19:14 ` Robert Hancock
2007-02-03 23:15   ` Stephen Clark
2007-02-03 23:28     ` Robert Hancock
2007-02-06 17:44       ` Bill Davidsen
2007-02-06 18:45         ` Mark Lord
2007-02-06 21:05         ` Jeff Garzik
2007-02-06 23:45         ` Robert Hancock [this message]
2007-02-03 23:44     ` Patrick Ale
2007-02-04  0:11       ` Stephen Clark
2007-02-04  0:18         ` Patrick Ale
2007-02-05 11:00           ` Patrick Ale
2007-02-05 14:23             ` Robert Hancock
2007-02-05 16:21               ` Patrick Ale
2007-02-05 18:15   ` Mark Lord
2007-02-06 17:49     ` Bill Davidsen
2007-02-08  2:16 Adam J. Richter
  -- strict thread matches above, loose matches on Subject: below --
2007-02-07 10:55 Adam J. Richter
2007-02-07 11:47 ` Patrick Ale
2007-02-03  8:41 Patrick Ale
2007-02-03  8:55 ` Patrick Ale
2007-02-03 12:07   ` Rene Rebe
2007-02-05 18:13 ` Mark Lord
2007-02-05 19:09   ` Alan
2007-02-05 21:19     ` Jeff Garzik
2007-02-05 19:21   ` Patrick Ale

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