Hi Bin, On 2022-01-05 02:21, Bin Meng wrote: > Hi Stefan, > > On Wed, Jan 5, 2022 at 3:48 AM Stefan Agner <[email protected]> wrote: >> >> Bin Meng, >> >> On 2021-09-27 17:14, Marek Vasut wrote: >> > On 9/27/21 2:42 PM, Stefan Agner wrote: >> >> There are devices which cause a USB stall when trying to read strings. >> >> Specifically Arduino Mega R3 stalls when trying to read the product >> >> string. >> >> >> >> The stall currently remains unhandled, and subsequent retries submit new >> >> transfers on a stopped endpoint which ultimately cause a crash in >> >> abort_td(): >> >> WARN halted endpoint, queueing URB anyway. >> >> XHCI control transfer timed out, aborting... >> >> Unexpected XHCI event TRB, skipping... (3affe040 00000000 13000000 >> >> 02008401) >> >> BUG at drivers/usb/host/xhci-ring.c:505/abort_td()! >> >> BUG! >> >> resetting ... >> >> >> >> Linux seems to be able to recover from the stall by issuing a >> >> TRB_RESET_EP command. >> >> >> >> Introduce reset_ep() which issues a TRB_RESET_EP followed by setting the >> >> transfer ring dequeue pointer via TRB_SET_DEQ. This allows to properly >> >> recover from a USB stall error and continue communicating with the USB >> >> device. >> >> >> >> Signed-off-by: Stefan Agner <[email protected]> >> > >> > I hope to get AB/RB from Bin here, then it can go into this release I >> > think. >> >> Any chance you could have a look at this to get it into this release :) >> > > Sorry I missed this. I suspect it's too late for 2022.01 to include > such big changes :(
I understand. Now that 2022.01 is out, could you have a look at this? -- Stefan
