This is a note to let you know that I've just added the patch titled

staging: gdm724x: Fix DMA from stack

to my staging git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git in the staging-testing branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will be merged to the staging-next branch sometime soon, after it passes testing, and the merge window is open.

If you have any questions about this process, please let me know.

From 7c3a0635cd008eaca9a734dc802709ee0b81cac5 Mon Sep 17 00:00:00 2001

From: Amey Narkhede ameynarkhede03@gmail.com Date: Thu, 11 Feb 2021 11:08:19 +0530 Subject: staging: gdm724x: Fix DMA from stack

Stack allocated buffers cannot be used for DMA on all architectures so allocate hci_packet buffer using kmalloc.

Reviewed-by: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Amey Narkhede ameynarkhede03@gmail.com Link: https://lore.kernel.org/r/20210211053819.34858-1-ameynarkhede03@gmail.com Cc: stable stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/staging/gdm724x/gdm_usb.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/gdm724x/gdm_usb.c b/drivers/staging/gdm724x/gdm_usb.c index dc4da66c3695..54bdb64f52e8 100644 --- a/drivers/staging/gdm724x/gdm_usb.c +++ b/drivers/staging/gdm724x/gdm_usb.c @@ -56,20 +56,24 @@ static int gdm_usb_recv(void *priv_dev,

static int request_mac_address(struct lte_udev *udev) { - u8 buf[16] = {0,}; - struct hci_packet *hci = (struct hci_packet *)buf; + struct hci_packet *hci; struct usb_device *usbdev = udev->usbdev; int actual; int ret = -1;

+ hci = kmalloc(struct_size(hci, data, 1), GFP_KERNEL); + if (!hci) + return -ENOMEM; + hci->cmd_evt = gdm_cpu_to_dev16(udev->gdm_ed, LTE_GET_INFORMATION); hci->len = gdm_cpu_to_dev16(udev->gdm_ed, 1); hci->data[0] = MAC_ADDRESS;

- ret = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 2), buf, 5, + ret = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 2), hci, 5, &actual, 1000);

udev->request_mac_addr = 1; + kfree(hci);

return ret; }