Re: [PATCH] uniform cdrom: fix mutex unlocking in/proc/sys/dev/cdrom/info file

From: Andrew Morton
Date: Tue Jun 15 2010 - 15:31:15 EST

On Tue, 15 Jun 2010 14:40:54 -0400
Davidlohr Bueso <dave.bueso@xxxxxxxxx> wrote:

> Regarding cdrom_sysctl_info(), I have noticed in several netbooks
> (haven't
> looked in other machines with no cdrom drive) that the
> /proc/sys/dev/cdrom/info file shows no values for the listed entries,
> ie:
> CD-ROM information, Id: cdrom.c 3.20 2003/12/17
> drive name:
> drive speed:
> drive # of slots:
> Can close tray:
> Can open tray:
> ...
> Now, is this expected behavior? If not, should it be changed to
> something
> more descriptive? Perhaps it would affect user space applications that
> read
> the file?

It works for me.

Does your kernel build have CONFIG_SYSCTL=n? If so, then all that code
is disabled. That seems a bit bogus to me and perhaps we should enable
at least some of that code by CONFIG_PROCFS instead.

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