On Tue, Nov 22, 2011 at 2:31 PM, Amit Nagal <helloin.amit@xxxxxxxxx> wrote: >>> Also , i have not test the case with the above patch when usb audio >>> streaming (capture ) is in progress >>> and a usb reset is issued . >> >> Do you have a way to test that? >> >> Regards >> Oliver >> > (1 ) Hi , to test this , in one terminal , i continously read usb audio interface ( /dev/dsp1) in a while loop , and in another terminal , i reset the usb device via a userspace program . At the time of reset , read(/dev/dsp1) failed with error : : Broken pipe . (2) Now , on linux machine , once read(/dev/dsp1) failed , i needed a minimum of 150 ms delay before i can reopen /dev/dsp1 successfully . if i donot provide this 150 ms delay , test program fails to re-open /dev/dsp1 , and in dmesg i could see a line 0:1:1: usb_set_interface failed . (3) i am enclosing the dmesg log when i donot provide 150 ms delay before reopen /dev/dsp1 : dmesg log with 150 ms delay case remains same except line 0:1:1: usb_set_interface failed . [ 1266.319331] ehci_hcd 0000:00:1d.7: GetStatus port:5 status 001005 0 ACK POWER sig=se0 PE CONNECT [ 1266.370024] usb 2-5: reset high-speed USB device number 2 using ehci_hcd [ 1266.378201] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 1 [ 1266.378324] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 2 [ 1266.378449] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 3 [ 1266.378574] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 4 [ 1266.378699] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 5 [ 1266.378824] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 6 [ 1266.378949] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 7 [ 1266.379075] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 8 [ 1266.379200] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 9 [ 1266.379324] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 10 [ 1266.379449] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 11 [ 1266.379574] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 12 [ 1266.379699] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 13 [ 1266.379823] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 14 [ 1266.379949] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 15 [ 1266.380074] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 16 [ 1266.380198] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 17 [ 1266.380324] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 18 [ 1266.380449] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 19 [ 1266.380574] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 20 [ 1266.380699] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 21 [ 1266.380824] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 22 [ 1266.380949] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 23 [ 1266.381075] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 24 [ 1266.381200] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 25 [ 1266.381324] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 26 [ 1266.381450] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 27 [ 1266.381574] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 28 [ 1266.381699] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 29 [ 1266.381824] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 30 [ 1266.381949] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 31 [ 1266.382074] ehci_hcd 0000:00:1d.7: devpath 5 ep0out 3strikes [ 1266.382576] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 1 [ 1266.382699] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 2 [ 1266.382824] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 3 [ 1266.382949] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 4 [ 1266.383074] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 5 [ 1266.383200] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 6 [ 1266.383325] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 7 [ 1266.383449] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 8 [ 1266.383574] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 9 [ 1266.383699] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 10 [ 1266.383824] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 11 [ 1266.383949] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 12 [ 1266.384074] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 13 [ 1266.384200] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 14 [ 1266.384324] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 15 [ 1266.384449] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 16 [ 1266.384574] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 17 [ 1266.384699] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 18 [ 1266.384824] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 19 [ 1266.384948] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 20 [ 1266.385075] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 21 [ 1266.385200] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 22 [ 1266.385323] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 23 [ 1266.385449] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 24 [ 1266.385573] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 25 [ 1266.385699] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 26 [ 1266.385824] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 27 [ 1266.385948] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 28 [ 1266.386075] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 29 [ 1266.386200] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 30 [ 1266.386324] ehci_hcd 0000:00:1d.7: detected XactErr len 0/8 retry 31 [ 1266.386449] ehci_hcd 0000:00:1d.7: devpath 5 ep0out 3strikes [ 1266.386460] 0:1:1: usb_set_interface failed [ 1266.421197] ehci_hcd 0000:00:1d.7: port 5 high speed [ 1266.421202] ehci_hcd 0000:00:1d.7: GetStatus port:5 status 001005 0 ACK POWER sig=se0 PE CONNECT [ 1267.659833] 2:1:1: cannot get freq at ep 0x81 (4) i have a query . At the time of reset , read(/dev/dsp1) fails with error broken pipe , Even when we donot apply the patch also , still usb audio modules gets unbind and then rebinds . As far as userspace is concerned , if some I/O is going on , it will feel the same effect of disconnect / broken pipe with or without the patch applied. i want to know what extra advantage will the implemention of pre-reset and post-reset functionality provide as compared to bind-unbind approach ? Thanx & Regards Amit Nagal -- 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
