Re: CDROM ioctl bug (fwd)

[Ron Lawrence]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 29 Nov 2001, Peter Osterlund wrote:
>Ron Lawrence <[e-mail]> 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             [e-mail]
>Sköndalsvägen 35            http://w1.894.telia.com/~u89404340
>S-128 66 Sköndal            [phone]
>Sweden

Ron Lawrence
[e-mail]
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org

iD8DBQE8Bm3GU0yq8UBYK2oRAsH/AJ9fy5LQSTiES5PD0BczAb82EXrsYgCaA3sI
zeX3IuZnQzh7B80TT4oJH4M=
=+UKy
-----END PGP SIGNATURE-----