Hi All,
As Mr.Alan Suggested there was one resource freeing which was still in use by
Application. That is Driver Specific structure, which is soted in
file->private_data in open system call. When disconnected was called i was
freeing this structure also which i think i should not free. Because Even
though device is disconnected application does not know about it yet. So it may
call further system calls on it, like read, write, ioctl... In those function
the first usual step we do is ...
struct scanner_dev *dev;
dev = (struct scanner_dev *)file->private_data;
if(!dev) // or if(!dev->device_present)
return -EBADF;
As soon as i free this dev structure in disconnect, there was kernel panic!!! (
Correct me if i am wrong)
One question:
What if probe function fails for some reason n user do insmod driver.ko... User
doesn't understand any printk's of driver n tries to open application n fail.
Is there anyway to tell him or notify him not to do that( other than printing
some Msg to console)? this may be very silly question but plz ans me...
Thanks alot for inputs
Savita
-------------------------------------------------------
This SF.Net email is sponsored by the JBoss Inc.
Get Certified Today * Register for a JBoss Training Course
Free Certification Exam for All Training Attendees Through End of 2005
Visit http://www.jboss.com/services/certification for more information
_______________________________________________
[email protected]
To unsubscribe, use the last form field at:
https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
