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Date: Thu, 29 Nov 2001 10:17:55 -0700 (MST)
From: Ron Lawrence <rlawrence@netraverse.com>
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To: Peter Osterlund <petero2@telia.com>
Cc: <linux-kernel@vger.kernel.org>, Jens Axboe <axboe@suse.de>
Subject: Re: CDROM ioctl bug (fwd)
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On 29 Nov 2001, Peter Osterlund wrote:
>Ron Lawrence <rlawrence@netraverse.com> writes:
>> busy. Here are the symptoms of my problem : doing reads from a CDROM
>> device intermingled with CDROM_MEDIA_CHANGED ioctls causes long pauses
>> during the ioctl. This behavior started in 2.4.10. The ioctl can take a
>> very long time to return, especially if reading large chunks.
>This patch fixes the problem for my USB CDROM device. Maybe a similar
>patch is needed for the IDE case, I haven't looked yet.

Thanks! I should have mentioned that it affects CDROM drives when accessed
via ide-scsi, but not when accessed "normally" via ide.  So, your patch
helps this case too. It is still significantly slower than "normal"
access, and I will run some tests to see if it's still slower in this case
than it was in 2.4.9.

>In general, who is responsible for unplugging the request queue after
>queuing an ioctl command?
>
>Peter ?sterlund             petero2@telia.com
>Sk?ndalsv?gen 35            http://w1.894.telia.com/~u89404340
>S-128 66 Sk?ndal            +46 8 942647
>Sweden

Ron Lawrence
rlawrence@NeTraverse.com
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