usb_control_msg initiates (and waits for completion of) a dma transfer using the supplied buffer. That buffer thus has to be seperately allocated on the heap. In lib/dma_debug.c the function check_for_stack even warns about it: WARNING: at lib/dma-debug.c:866 check_for_stack Note: This change is tested to compile only, as I don't have the hardware. Signed-off-by: Florian Mickler <florian@xxxxxxxxxxx> --- drivers/media/dvb/dvb-usb/a800.c | 17 +++++++++++++---- 1 files changed, 13 insertions(+), 4 deletions(-) diff --git a/drivers/media/dvb/dvb-usb/a800.c b/drivers/media/dvb/dvb-usb/a800.c index 53b93a4..fe2366b 100644 --- a/drivers/media/dvb/dvb-usb/a800.c +++ b/drivers/media/dvb/dvb-usb/a800.c @@ -78,17 +78,26 @@ static struct rc_map_table rc_map_a800_table[] = { static int a800_rc_query(struct dvb_usb_device *d, u32 *event, int *state) { - u8 key[5]; + int ret; + u8 *key = kmalloc(5, GFP_KERNEL); + if (!key) + return -ENOMEM; + if (usb_control_msg(d->udev,usb_rcvctrlpipe(d->udev,0), 0x04, USB_TYPE_VENDOR | USB_DIR_IN, 0, 0, key, 5, - 2000) != 5) - return -ENODEV; + 2000) != 5) { + ret = -ENODEV; + goto out; + } /* call the universal NEC remote processor, to find out the key's state and event */ dvb_usb_nec_rc_key_to_event(d,key,event,state); if (key[0] != 0) deb_rc("key: %x %x %x %x %x\n",key[0],key[1],key[2],key[3],key[4]); - return 0; + ret = 0; +out: + kfree(key); + return ret; } /* USB Driver stuff */ -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html