Hi,

I have a question about sysfs interface.

If you open a sysfs file created by a module, then remove it (rmmoding 
the module that create this sysfs file), then try to read the opened 
file, you often get strange result (segdefault or oppps).

I attach a small program to test it : open your sysfs file with it 
`wait_read /sysfs/file', rmmod the module, and press enter.

I was wondering if it is to user of sysfs to prevent that (with mutex, 
...) or it is a sysfs bug ?

If it is the first case, I fear that lot's of modules are broken.

Regards,

Matthieu

PS : CC me as I am not subscribed to lkml.