Probably I found the root cause of this problem. After enabling the HIGHMEM and VMSPLIT_3G, the urb sent to the driver of dwc_otg maybe allocated in the highmem, if it is in the highmem, the usb core will not set the urb->transfer_buffer and call hcd->urb_enquenue().
With other hcd drivers, they could handle the situation of urb->transfer_buffer to be NULL, but for dwc_otg hcd driver, it returns an error unconditionally if the urb->transfer_buffer is NULL. I check the code, the dwc_otg driver could handle the situation that the urb buffer is in highmem (urb->tansfer_buffer is NULL). Maybe we could fix this issue with a simple patch, I will post my found to the upstream bug https://github.com/raspberrypi/linux/issues/3332 hwang4@hwang4-Vostro-5390:~/work/mainline/raspi/linux-32$ git diff diff --git a/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c b/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c index 08a3e41038a3..5d04adfc58c0 100644 --- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c +++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c @@ -821,10 +821,10 @@ static int dwc_otg_urb_enqueue(struct usb_hcd *hcd, dump_urb_info(urb, "dwc_otg_urb_enqueue"); } #endif - +#if 0 if (!urb->transfer_buffer && urb->transfer_buffer_length) return -EINVAL; - +#endif if ((usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) || (usb_pipetype(urb->pipe) == PIPE_INTERRUPT)) { if (!dwc_otg_hcd_is_bandwidth_allocated -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1852510 Title: IO errors when writing large amounts of data to USB storage in eoan on RPI To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-raspi2/+bug/1852510/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
