Re: CDROM ioctl bug (fwd)

[Ron Lawrence <rlawrence@netraverse.com>]

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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 Österlund             petero2@telia.com
>Sköndalsvägen 35            http://w1.894.telia.com/~u89404340
>S-128 66 Sköndal            +46 8 942647
>Sweden

Ron Lawrence
rlawrence@NeTraverse.com
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