[PATCH 4.9 163/167] Input: bcm5974 - set missing URB_NO_TRANSFER_DMA_MAP urb flag

Greg Kroah-Hartman
2022-06-13T10:32:53Z

From: Mathias Nyman <mathias.nyman@linux.intel.com>

commit c42e65664390be7c1ef3838cd84956d3a2739d60 upstream.

The bcm5974 driver does the allocation and dma mapping of the usb urb
data buffer, but driver does not set the URB_NO_TRANSFER_DMA_MAP flag
to let usb core know the buffer is already mapped.

usb core tries to map the already mapped buffer, causing a warning:
"xhci_hcd 0000:00:14.0: rejecting DMA map of vmalloc memory"

Fix this by setting the URB_NO_TRANSFER_DMA_MAP, letting usb core
know buffer is already mapped by bcm5974 driver

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Cc: stable@vger.kernel.org
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215890
Link: https://lore.kernel.org/r/20220606113636.588955-1-mathias.nyman@linux.intel.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/input/mouse/bcm5974.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/input/mouse/bcm5974.c
+++ b/drivers/input/mouse/bcm5974.c
@@ -956,17 +956,22 @@ static int bcm5974_probe(struct usb_inte
if (!dev->tp_data)
goto err_free_bt_buffer;

- if (dev->bt_urb)
+ if (dev->bt_urb) {
usb_fill_int_urb(dev->bt_urb, udev,
usb_rcvintpipe(udev, cfg->bt_ep),
dev->bt_data, dev->cfg.bt_datalen,
bcm5974_irq_button, dev, 1);

+ dev->bt_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+ }
+
usb_fill_int_urb(dev->tp_urb, udev,
usb_rcvintpipe(udev, cfg->tp_ep),
dev->tp_data, dev->cfg.tp_datalen,
bcm5974_irq_trackpad, dev, 1);

+ dev->tp_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+
/* create bcm5974 device */
usb_make_path(udev, dev->phys, sizeof(dev->phys));
strlcat(dev->phys, "/input0", sizeof(dev->phys));