On 2/16/22 08:53, Bin Meng wrote:
On Mon, Sep 27, 2021 at 8:43 PM Stefan Agner stefan@agner.ch 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 stefan@agner.ch
Applied, thanks.