July 4, 2011
12:43 p.m.
Hi , if a application is doing read /write I/O with a usb device , in 2 different threads in userspace , and at usb disconnect event , read thread returns with error and application calls close() subsequently without waiting for write thread to finish . Do the VFS upper layers maintain locks that take care that until both read and write methods in usb driver donot finish and return with error in kernel space close will pend and usb driver release method will not be called ? Regards Amit Nagal