From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugme-daemon@bugzilla.kernel.org
Subject: [Bug 12320] warn_on_slowpath when playing audio CD
Date: Tue, 30 Dec 2008 03:56:14 -0800 (PST)
Message-ID: <20081230115614.8AACA10800C@picon.linux-foundation.org>
References: <bug-12320-11633@http.bugzilla.kernel.org/>
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http://bugzilla.kernel.org/show_bug.cgi?id=12320





------- Comment #10 from nm127@freemail.hu  2008-12-30 03:56 -------
Created an attachment (id=19538)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=19538&action=view)
revert 9bd27cba1aeacb6b12d05f4e5ed6361072f08fe0

(In reply to comment #6)
> Created an attachment (id=19528)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=19528&action=view) [details]
> git bisect log
> 
> (In reply to comment #3)
> > I started to git bisecting the problem but this might take a while.
> 
> The result of git bisecting is:
> 
> 9bd27cba1aeacb6b12d05f4e5ed6361072f08fe0 is first bad commit
> commit 9bd27cba1aeacb6b12d05f4e5ed6361072f08fe0
> Author: Borislav Petkov <petkovbb@gmail.com>
> Date:   Sun Nov 2 21:40:07 2008 +0100
> 
>     ide-cd: fix DMA alignment regression
> 
>     e5318b531b008c79d2a0c0df06a7b8628da38e2f ("ide: use the dma safe check for
>     REQ_TYPE_ATA_PC") introduced a regression which caused some ATAPI drives to
>     turn off DMA for REQ_TYPE_BLOCK_PC commands while burning and thus
> degrading
>     performance and ultimately causing an excessive amount of underruns.
> 
>     The issue is documented also in:
>     http://bugzilla.kernel.org/show_bug.cgi?id=11742.
> 
>     Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
>     Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
>     Tested-by: Valerio Passini <valerio.passini@unicam.it>
>     [bart: fixup patch description per comments from Sergei Shtylyov]
>     Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
> 
> :040000 040000 998c57acb8e63f2f1d64543f2c03ecfc05beb3a0
> fef197de8e3c9db1308917eaeb1c10f196a8a8ab M      drivers

Reverting this patch on top of 2.6.28 removes the warn_on_slowpath messages
from dmesg.


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