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usbnet/cdc_ncm: Don't use stack variables for DMA 

The cdc_ncm driver still has a few places where stack variables are
passed to the cdc_ncm_do_request function.  This triggers a stack trace in
lib/dma-debug.c if the CONFIG_DEBUG_DMA_API option is set.

Adjust these calls to pass parameters that have been allocated with
kzalloc.

Signed-off-by: Josh Boyer <jwboyer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Josh Boyer 2011-08-08 02:34:07 +00:00 committed by David S. Miller
parent f6957f88e5
commit 75bc8ef528
1 changed files with 49 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

67
drivers/net/usb/cdc_ncm.c
View File

@ -228,23 +228,40 @@ static u8 cdc_ncm_setup(struct cdc_ncm_ctx *ctx)
if (ctx->rx_max != le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize)) {
if (flags & USB_CDC_NCM_NCAP_NTB_INPUT_SIZE) {
struct usb_cdc_ncm_ndp_input_size ndp_in_sz;
err = usb_control_msg(ctx->udev,
usb_sndctrlpipe(ctx->udev, 0),
USB_CDC_SET_NTB_INPUT_SIZE,
USB_TYPE_CLASS | USB_DIR_OUT
| USB_RECIP_INTERFACE,
0, iface_no, &ndp_in_sz, 8, 1000);
} else {
__le32 dwNtbInMaxSize = cpu_to_le32(ctx->rx_max);
err = usb_control_msg(ctx->udev,
usb_sndctrlpipe(ctx->udev, 0),
USB_CDC_SET_NTB_INPUT_SIZE,
USB_TYPE_CLASS | USB_DIR_OUT
| USB_RECIP_INTERFACE,
0, iface_no, &dwNtbInMaxSize, 4, 1000);
struct usb_cdc_ncm_ndp_input_size *ndp_in_sz;
ndp_in_sz = kzalloc(sizeof(*ndp_in_sz), GFP_KERNEL);
if (!ndp_in_sz) {
err = -ENOMEM;
goto size_err;
}
err = usb_control_msg(ctx->udev,
usb_sndctrlpipe(ctx->udev, 0),
USB_CDC_SET_NTB_INPUT_SIZE,
USB_TYPE_CLASS | USB_DIR_OUT
| USB_RECIP_INTERFACE,
0, iface_no, ndp_in_sz, 8, 1000);
kfree(ndp_in_sz);
} else {
__le32 *dwNtbInMaxSize;
dwNtbInMaxSize = kzalloc(sizeof(*dwNtbInMaxSize),
GFP_KERNEL);
if (!dwNtbInMaxSize) {
err = -ENOMEM;
goto size_err;
}
*dwNtbInMaxSize = cpu_to_le32(ctx->rx_max);
err = usb_control_msg(ctx->udev,
usb_sndctrlpipe(ctx->udev, 0),
USB_CDC_SET_NTB_INPUT_SIZE,
USB_TYPE_CLASS | USB_DIR_OUT
| USB_RECIP_INTERFACE,
0, iface_no, dwNtbInMaxSize, 4, 1000);
kfree(dwNtbInMaxSize);
}
size_err:
if (err < 0)
pr_debug("Setting NTB Input Size failed\n");
}
@ -325,19 +342,29 @@ static u8 cdc_ncm_setup(struct cdc_ncm_ctx *ctx)
/* set Max Datagram Size (MTU) */
if (flags & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE) {
__le16 max_datagram_size;
__le16 *max_datagram_size;
u16 eth_max_sz = le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
max_datagram_size = kzalloc(sizeof(*max_datagram_size),
GFP_KERNEL);
if (!max_datagram_size) {
err = -ENOMEM;
goto max_dgram_err;
}
err = usb_control_msg(ctx->udev, usb_rcvctrlpipe(ctx->udev, 0),
USB_CDC_GET_MAX_DATAGRAM_SIZE,
USB_TYPE_CLASS | USB_DIR_IN
| USB_RECIP_INTERFACE,
0, iface_no, &max_datagram_size,
0, iface_no, max_datagram_size,
2, 1000);
if (err < 0) {
pr_debug("GET_MAX_DATAGRAM_SIZE failed, use size=%u\n",
CDC_NCM_MIN_DATAGRAM_SIZE);
kfree(max_datagram_size);
} else {
ctx->max_datagram_size = le16_to_cpu(max_datagram_size);
ctx->max_datagram_size =
le16_to_cpu(*max_datagram_size);
/* Check Eth descriptor value */
if (eth_max_sz < CDC_NCM_MAX_DATAGRAM_SIZE) {
if (ctx->max_datagram_size > eth_max_sz)
@ -360,8 +387,10 @@ static u8 cdc_ncm_setup(struct cdc_ncm_ctx *ctx)
USB_TYPE_CLASS | USB_DIR_OUT
| USB_RECIP_INTERFACE,
0,
iface_no, &max_datagram_size,
iface_no, max_datagram_size,
2, 1000);
kfree(max_datagram_size);
max_dgram_err:
if (err < 0)
pr_debug("SET_MAX_DATAGRAM_SIZE failed\n");
}