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[media] vp7045: fix buffer setup

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dvb_usb_device_init calls the frontend_attach method of this driver which
uses vp7045_usb_ob. In order to have a buffer ready in vp7045_usb_op, it has to
be allocated before that happens.

Luckily we can use the whole private data as the buffer as it gets separately
allocated on the heap via kzalloc in dvb_usb_device_init and is thus apt for
use via usb_control_msg.

This fixes a
	BUG: unable to handle kernel paging request at 0000000000001e78

reported by Tino Keitel and diagnosed by Dan Carpenter.

Cc: stable@kernel.org # For v3.0 and upper
Tested-by: Tino Keitel <tino.keitel@tikei.de>
Signed-off-by: Florian Mickler <florian@mickler.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Florian Mickler 2011-08-10 07:05:20 -03:00 committed by Mauro Carvalho Chehab
parent de4ed0c111
commit fc61ccd35f
1 changed files with 4 additions and 22 deletions
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26
drivers/media/dvb/dvb-usb/vp7045.c
View file

@ -224,26 +224,8 @@ static struct dvb_usb_device_properties vp7045_properties;
static int vp7045_usb_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct dvb_usb_device *d;
int ret = dvb_usb_device_init(intf, &vp7045_properties,
THIS_MODULE, &d, adapter_nr);
if (ret)
return ret;
d->priv = kmalloc(20, GFP_KERNEL);
if (!d->priv) {
dvb_usb_device_exit(intf);
return -ENOMEM;
}
return ret;
}
static void vp7045_usb_disconnect(struct usb_interface *intf)
{
struct dvb_usb_device *d = usb_get_intfdata(intf);
kfree(d->priv);
dvb_usb_device_exit(intf);
return dvb_usb_device_init(intf, &vp7045_properties,
THIS_MODULE, NULL, adapter_nr);
}
static struct usb_device_id vp7045_usb_table [] = {
@ -258,7 +240,7 @@ MODULE_DEVICE_TABLE(usb, vp7045_usb_table);
static struct dvb_usb_device_properties vp7045_properties = {
.usb_ctrl = CYPRESS_FX2,
.firmware = "dvb-usb-vp7045-01.fw",
.size_of_priv = sizeof(u8 *),
.size_of_priv = 20,
.num_adapters = 1,
.adapter = {
@ -305,7 +287,7 @@ static struct dvb_usb_device_properties vp7045_properties = {
static struct usb_driver vp7045_usb_driver = {
.name = "dvb_usb_vp7045",
.probe = vp7045_usb_probe,
.disconnect = vp7045_usb_disconnect,
.disconnect = dvb_usb_device_exit,
.id_table = vp7045_usb_table,
};