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Subject[PATCH v3] staging: gdm724x: Fix DMA from stack
Date
Stack allocated buffers cannot be used for DMA
on all architectures so allocate hci_packet buffer
using kmalloc.

Signed-off-by: Amey Narkhede <ameynarkhede03@gmail.com>
---
Changes in v3:
- Remove superfluous buf pointer
- Reduce size of allocation of hci_packet to match number of
bytes used for DMA

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 dc4da66c3..80c58a3ef 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(5, 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;
}
--
2.30.1
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