From: Stefan Schmidt Date: Thu, 15 Dec 2016 17:40:16 +0000 (+0100) Subject: ieee802154: atusb: do not use the stack for address fetching to make it DMA able X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=5eb35a6ccea61648a55713c076ab65423eea1ac0;p=linux-beck.git ieee802154: atusb: do not use the stack for address fetching to make it DMA able From 4.9 we should really avoid using the stack here as this will not be DMA able on various platforms. This changes a buffer that was introduced in the 4.10 merge window. Fixes: 6cc33eba232c ("ieee802154: atusb: try to read permanent extended address from device") Reported-by: Dan Carpenter Signed-off-by: Stefan Schmidt Signed-off-by: Marcel Holtmann --- diff --git a/drivers/net/ieee802154/atusb.c b/drivers/net/ieee802154/atusb.c index 67790f88908d..63cb67917a07 100644 --- a/drivers/net/ieee802154/atusb.c +++ b/drivers/net/ieee802154/atusb.c @@ -721,7 +721,7 @@ fail: static int atusb_set_extended_addr(struct atusb *atusb) { struct usb_device *usb_dev = atusb->usb_dev; - unsigned char buffer[IEEE802154_EXTENDED_ADDR_LEN]; + unsigned char *buffer; __le64 extended_addr; u64 addr; int ret; @@ -733,6 +733,10 @@ static int atusb_set_extended_addr(struct atusb *atusb) return 0; } + buffer = kmalloc(IEEE802154_EXTENDED_ADDR_LEN, GFP_KERNEL); + if (!buffer) + return -ENOMEM; + /* Firmware is new enough so we fetch the address from EEPROM */ ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0), ATUSB_EUI64_READ, ATUSB_REQ_FROM_DEV, 0, 0, @@ -740,6 +744,7 @@ static int atusb_set_extended_addr(struct atusb *atusb) if (ret < 0) { dev_err(&usb_dev->dev, "failed to fetch extended address, random address set\n"); ieee802154_random_extended_addr(&atusb->hw->phy->perm_extended_addr); + kfree(buffer); return ret; } @@ -755,6 +760,7 @@ static int atusb_set_extended_addr(struct atusb *atusb) &addr); } + kfree(buffer); return ret; }