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From: Marcin Dawidowicz <marcin.dawidowicz@kontron.pl>
To: linuxppc-dev@ozlabs.org
Date: Thu, 16 Jun 2005 11:23:41 +0200
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Cc: Garcia =?iso-8859-1?q?J=E9r=E9mie?= <GARCIAJ@3il.fr>
Subject: Re: Error while opennig device file
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On Thursday 16 of June 2005 10:35, Garcia J=E9r=E9mie wrote:
> static int test_open(struct inode *inode , struct file *file)
> {
>   int ret_val =3D 0;
>
>   if (Device_open !=3D 0)   <------
>     return -EBUSY;           <------
>
>   Device_open++;          <------
>   printk("%d minor number!\n",MINOR(inode->i_rdev));
>   MOD_INC_USE_COUNT;
>
>   return ret_val;
> }
>
> Very traditionnal...
>
Have a look on marked lines.

>  What error do you get on second open?
> --> I trace the execution of my programm and get the following :
> First opened succeeded, open() return code : 3 =A0 =A0
> Can't open second file, open() return code : -1 , errno =3D 16
>
> Looking in the errno.h, we have :
> #define=A0EBUSY=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A016=A0=A0=A0=A0=A0=A0/* De=
vice or resource busy */

This is what I would expect. You can remove marked lines and try again...

Regards,
Marcin