1 From 2a15e634d80f78cf2d8aa16ecf0f3cf930e277b4 Mon Sep 17 00:00:00 2001
2 From: Hui Wang <hui.wang@canonical.com>
3 Date: Sun, 17 Nov 2019 10:31:46 +0800
4 Subject: [PATCH] dwc_otg: checking the urb->transfer_buffer too early
7 After enable the HIGHMEM and VMSPLIT_3G, the dwc_otg driver doesn't
8 work well on Pi2/3 boards with 1G physical ram. Users experience
9 the failure when copying a file of 600M size to the USB stick. And
10 at the same time, the dmesg shows:
11 usb 1-1.1.2: reset high-speed USB device number 8 using dwc_otg
12 sd 0:0:0:0: [sda] tag#0 FAILED Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK
13 blk_update_request: I/O error, dev sda, sector 3024048 op 0x1:(WRITE) flags 0x4000 phys_seg 15 prio class 0
15 When this happens, the sg_buf sent to the driver is located in the
16 highmem region, the usb_sg_init() in the core/message.c will leave
17 transfer_buffer to NULL if the sg_buf is in highmem, but in the
18 dwc_otg driver, it returns -EINVAL unconditionally if transfer_buffer
21 The driver can handle the situation of buffer to be NULL, if it is in
22 DMA mode, it will convert an address from transfer_dma.
24 But if the conversion fails or it is in the PIO mode, we should check
25 buffer and return -EINVAL if it is NULL.
27 BugLink: https://bugs.launchpad.net/bugs/1852510
28 Signed-off-by: Hui Wang <hui.wang@canonical.com>
30 drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c | 11 +++++++----
31 1 file changed, 7 insertions(+), 4 deletions(-)
33 --- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c
34 +++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c
35 @@ -821,10 +821,6 @@ static int dwc_otg_urb_enqueue(struct us
36 dump_urb_info(urb, "dwc_otg_urb_enqueue");
40 - if (!urb->transfer_buffer && urb->transfer_buffer_length)
43 if ((usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS)
44 || (usb_pipetype(urb->pipe) == PIPE_INTERRUPT)) {
45 if (!dwc_otg_hcd_is_bandwidth_allocated
46 @@ -881,6 +877,13 @@ static int dwc_otg_urb_enqueue(struct us
47 &urb->transfer_dma, buf);
50 + if (!buf && urb->transfer_buffer_length) {
51 + DWC_FREE(dwc_otg_urb);
52 + DWC_ERROR("transfer_buffer is NULL in PIO mode or both "
53 + "transfer_buffer and transfer_dma are NULL in DMA mode\n");
57 if (!(urb->transfer_flags & URB_NO_INTERRUPT))
58 flags |= URB_GIVEBACK_ASAP;
59 if (urb->transfer_flags & URB_ZERO_PACKET)