Hi, I'm running kernel 2.6.20 on an AT91RM9200 processor. I have the gadget serial driver loaded and I am successfully reading and writing data in and out the USB port to a windows terminal. In my user code, when I open the gadget driver port, I open it with the default blocking flag so that my user thread will sleep while waiting for data to come in. My problem is that when I pull the USB cable which causes a disconnect, the read() call never returns in my user code thereby locking the thread that it is called in.
I have turned on debugs in the driver's module and am I am monitoring the Gadget Driver in another thread by cat /proc/kmsg and can clearly see that the Gadget Driver function gs_disconnect(struct usb_gadget *gadget) is being called. The driver reacts fine to the connects and disconnects but the user mode read() function is the problem. I'm pretty new to driver development and I've been attempting to trace the problem through the tty driver and the line discipline to attempt to understand how things work. After 3 days, I'm gaining some understanding but I really could use some help. I would think that lots of apps would have to handle the USB cord being yanked out. Does anyone have any insight into this? Thanks for reading. Robert P. Sagusti ENSCO Inc., APA Division 5400 Port Royal Rd. Springfield, VA 22151 (703) 321-4407 [EMAIL PROTECTED] ...................................................................... The information contained in this email message is intended only for the use of the individuals to whom it is addressed and may contain information that is privileged and sensitive. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender immediately by email at the above referenced address. Thank you. ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
