From: <benh@kernel.crashing.org>
To: Andrew Morton <akpm@zip.com.au>
Cc: Ed Sweetman <ed.sweetman@wmich.edu>,
Kristian <kristian.peters@korseby.net>,
<linux-kernel@vger.kernel.org>
Subject: Re: [CFT] Bus mastering support for IDE CDROM audio
Date: Mon, 28 Jan 2002 10:51:36 +0100 [thread overview]
Message-ID: <20020128095136.1298@mailhost.mipsys.com> (raw)
In-Reply-To: <3C550BD4.E9CBE6A@zip.com.au>
In-Reply-To: <3C550BD4.E9CBE6A@zip.com.au>
>At no stage does a packet-mode DMA error turn off drive-level
>DMA. This is because some devices seem to perform ordinary
>ATA DMA OK, but screw up packet DMA.
>
>The kernel internally retries the requests when it performs fallback,
>so userspace shouldn't see any disruption as the kernel works
>out what to do.
>
>Once the drive has fallen back to single-frame (or PIO mode) for
>packet reads, the only way to get it back to a higher level is
>a reboot.
Doesn that mean that a bad media (typically a scratched CDROM) will
cause the drive to revert to PIO until next reboot ?
Ben.
next prev parent reply other threads:[~2002-01-28 9:52 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-25 8:40 [CFT] Bus mastering support for IDE CDROM audio Andrew Morton
2002-01-25 19:21 ` Kevin P. Fleming
2002-01-27 2:13 ` Dan Chen
2002-01-27 3:16 ` Andrew Morton
2002-01-27 6:41 ` Andrew Morton
2002-01-27 9:11 ` Kristian
2002-01-27 10:19 ` Kristian
2002-01-27 19:54 ` Ed Sweetman
2002-01-28 8:29 ` Andrew Morton
2002-01-28 9:51 ` benh [this message]
2002-01-28 9:51 ` Andrew Morton
2002-01-28 15:50 ` Ed Sweetman
2002-01-28 17:13 ` Kristian
2002-01-28 13:51 ` Kristian
2002-01-28 19:21 ` Kevin P. Fleming
2002-01-26 8:43 ` Dan Chen
2002-01-26 12:03 ` Kristian
2002-01-27 21:21 ` Robert Love
2002-01-27 21:25 ` Jens Axboe
2002-01-27 21:36 ` Andrew Morton
2002-01-27 21:40 ` Robert Love
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