On Fri, Jul 24, 2009 at 8:13 PM, Alan Stern<stern@xxxxxxxxxxxxxxxxxxx> wrote: > dummy-hcd doesn't use buffer heads at all; it uses only usb_requests. > There's a reason why the structures are named "fsg_buffhd" -- it's > because they are private to the fsg driver. Dear Alan, Thanks for your information and help. As I explained in my previous emails, I have implemented the multiple threads (two threads) in the gadget driver and it is working fine when the storage driver issues commands sequentially. However, when the storage driver issues the multiple commands (currently 2 commands at a time) to the gadget driver, the gadget is not able to handle them. The issue is like this, in the gadget driver, one thread sends the status on the bulk in pipe which is for 10 bytes where as storage requested 4 bytes and 10 bytes from two different threads. The gadget driver is expecting 10 bytes first but the bulk_in callback gets 4 bytes which results in a crash. Here my question is, the gadget driver first calls (invokes) the start_transfer method, then only the bulk_in command complete callback is invoked. But, is there any way to invoke the callback complete method without calling the start_transfer method. My idea is, if the callback complete routine called first, then I will send the requested number of bytes instead of sending the bytes to the upper layer through start_transfer method. Please let me know if there are any ideas. Thanks and Regards, Madhavi M -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
