Experimental Physics and
Industrial Control System
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| <== Date ==> | <== Thread ==> |
|---|
| Subject: | ~kernel/driver message |
| From: | Sebastian Matkovich <[email protected]> |
| To: | [email protected] |
| Date: | Sat, 11 May 2013 13:27:58 -0100 |
hey, does this kernel message say you anything? kernel: gpib: need to hold board lock to perform ioctl; i found the sourcecode writing this: if( current->pid != board->locking_pid )
{
printk( "gpib: need to hold board lock to perform ioctl %i\n",
cmd & 0xff );
retval = -EPERM;
goto done;
}
what i try is to build device support for a powersupply connected through a gpib interface.
someone told me it might be because two different processes try to access the board, or maybe it isn't accessed by root (but i executed the ioc as root), has anyone got an idea?^^
{
printk( "gpib: need to hold board lock to perform ioctl %i\n",
cmd & 0xff );
retval = -EPERM;
goto done;
}
what i try is to build device support for a powersupply connected through a gpib interface.
someone told me it might be because two different processes try to access the board, or maybe it isn't accessed by root (but i executed the ioc as root), has anyone got an idea?^^
- Replies:
- Re: ~kernel/driver message Rod Nussbaumer
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