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60 lines
2.3 KiB
Diff
60 lines
2.3 KiB
Diff
From 2a15e634d80f78cf2d8aa16ecf0f3cf930e277b4 Mon Sep 17 00:00:00 2001
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From: Hui Wang <hui.wang@canonical.com>
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Date: Sun, 17 Nov 2019 10:31:46 +0800
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Subject: [PATCH] dwc_otg: checking the urb->transfer_buffer too early
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(#3332)
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After enable the HIGHMEM and VMSPLIT_3G, the dwc_otg driver doesn't
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work well on Pi2/3 boards with 1G physical ram. Users experience
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the failure when copying a file of 600M size to the USB stick. And
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at the same time, the dmesg shows:
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usb 1-1.1.2: reset high-speed USB device number 8 using dwc_otg
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sd 0:0:0:0: [sda] tag#0 FAILED Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK
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blk_update_request: I/O error, dev sda, sector 3024048 op 0x1:(WRITE) flags 0x4000 phys_seg 15 prio class 0
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When this happens, the sg_buf sent to the driver is located in the
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highmem region, the usb_sg_init() in the core/message.c will leave
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transfer_buffer to NULL if the sg_buf is in highmem, but in the
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dwc_otg driver, it returns -EINVAL unconditionally if transfer_buffer
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is NULL.
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The driver can handle the situation of buffer to be NULL, if it is in
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DMA mode, it will convert an address from transfer_dma.
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But if the conversion fails or it is in the PIO mode, we should check
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buffer and return -EINVAL if it is NULL.
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BugLink: https://bugs.launchpad.net/bugs/1852510
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Signed-off-by: Hui Wang <hui.wang@canonical.com>
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---
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drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c | 11 +++++++----
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1 file changed, 7 insertions(+), 4 deletions(-)
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--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c
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+++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c
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@@ -821,10 +821,6 @@ static int dwc_otg_urb_enqueue(struct us
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dump_urb_info(urb, "dwc_otg_urb_enqueue");
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}
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#endif
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-
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- if (!urb->transfer_buffer && urb->transfer_buffer_length)
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- return -EINVAL;
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-
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if ((usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS)
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|| (usb_pipetype(urb->pipe) == PIPE_INTERRUPT)) {
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if (!dwc_otg_hcd_is_bandwidth_allocated
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@@ -881,6 +877,13 @@ static int dwc_otg_urb_enqueue(struct us
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&urb->transfer_dma, buf);
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}
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+ if (!buf && urb->transfer_buffer_length) {
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+ DWC_FREE(dwc_otg_urb);
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+ DWC_ERROR("transfer_buffer is NULL in PIO mode or both "
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+ "transfer_buffer and transfer_dma are NULL in DMA mode\n");
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+ return -EINVAL;
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+ }
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+
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if (!(urb->transfer_flags & URB_NO_INTERRUPT))
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flags |= URB_GIVEBACK_ASAP;
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if (urb->transfer_flags & URB_ZERO_PACKET)
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