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[media] a800: get rid of on-stack dma buffers 

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@mickler.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Florian Mickler 2011-03-21 15:33:41 -03:00 committed by Mauro Carvalho Chehab
parent ca73877587
commit 54f4e11ae3
1 changed files with 13 additions and 4 deletions
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17
drivers/media/dvb/dvb-usb/a800.c
View File

@ -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 */