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[media] dtt200u: don't do DMA on stack

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The USB control messages require DMA to work. We cannot pass
a stack-allocated buffer, as it is not warranted that the
stack would be into a DMA enabled area.

Reviewed-by: Patrick Boettcher <patrick.boettcher@posteo.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2016-10-07 08:40:43 -03:00 committed by Mauro Carvalho Chehab
parent ba705a629c
commit ab883e2de3
1 changed files with 75 additions and 29 deletions
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104
drivers/media/usb/dvb-usb/dtt200u.c
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@ -20,74 +20,103 @@ MODULE_PARM_DESC(debug, "set debugging level (1=info,xfer=2 (or-able))." DVB_USB
DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
struct dtt200u_state {
unsigned char data[80];
struct mutex data_mutex;
};
static int dtt200u_power_ctrl(struct dvb_usb_device *d, int onoff)
{
u8 b = SET_INIT;
struct dtt200u_state *st = d->priv;
mutex_lock(&st->data_mutex);
st->data[0] = SET_INIT;
if (onoff)
dvb_usb_generic_write(d,&b,2);
dvb_usb_generic_write(d, st->data, 2);
mutex_unlock(&st->data_mutex);
return 0;
}
static int dtt200u_streaming_ctrl(struct dvb_usb_adapter *adap, int onoff)
{
u8 b_streaming[2] = { SET_STREAMING, onoff };
u8 b_rst_pid = RESET_PID_FILTER;
struct dtt200u_state *st = adap->dev->priv;
dvb_usb_generic_write(adap->dev, b_streaming, 2);
mutex_lock(&st->data_mutex);
st->data[0] = SET_STREAMING;
st->data[1] = onoff;
dvb_usb_generic_write(adap->dev, st->data, 2);
if (onoff)
return 0;
st->data[0] = RESET_PID_FILTER;
dvb_usb_generic_write(adap->dev, st->data, 1);
mutex_unlock(&st->data_mutex);
if (onoff == 0)
dvb_usb_generic_write(adap->dev, &b_rst_pid, 1);
return 0;
}
static int dtt200u_pid_filter(struct dvb_usb_adapter *adap, int index, u16 pid, int onoff)
{
u8 b_pid[4];
struct dtt200u_state *st = adap->dev->priv;
int ret;
pid = onoff ? pid : 0;
b_pid[0] = SET_PID_FILTER;
b_pid[1] = index;
b_pid[2] = pid & 0xff;
b_pid[3] = (pid >> 8) & 0x1f;
mutex_lock(&st->data_mutex);
st->data[0] = SET_PID_FILTER;
st->data[1] = index;
st->data[2] = pid & 0xff;
st->data[3] = (pid >> 8) & 0x1f;
return dvb_usb_generic_write(adap->dev, b_pid, 4);
ret = dvb_usb_generic_write(adap->dev, st->data, 4);
mutex_unlock(&st->data_mutex);
return ret;
}
static int dtt200u_rc_query(struct dvb_usb_device *d)
{
u8 key[5],cmd = GET_RC_CODE;
struct dtt200u_state *st = d->priv;
u32 scancode;
dvb_usb_generic_rw(d,&cmd,1,key,5,0);
if (key[0] == 1) {
mutex_lock(&st->data_mutex);
st->data[0] = GET_RC_CODE;
dvb_usb_generic_rw(d, st->data, 1, st->data, 5, 0);
if (st->data[0] == 1) {
enum rc_type proto = RC_TYPE_NEC;
scancode = key[1];
if ((u8) ~key[1] != key[2]) {
scancode = st->data[1];
if ((u8) ~st->data[1] != st->data[2]) {
/* Extended NEC */
scancode = scancode << 8;
scancode |= key[2];
scancode |= st->data[2];
proto = RC_TYPE_NECX;
}
scancode = scancode << 8;
scancode |= key[3];
scancode |= st->data[3];
/* Check command checksum is ok */
if ((u8) ~key[3] == key[4])
if ((u8) ~st->data[3] == st->data[4])
rc_keydown(d->rc_dev, proto, scancode, 0);
else
rc_keyup(d->rc_dev);
} else if (key[0] == 2) {
} else if (st->data[0] == 2) {
rc_repeat(d->rc_dev);
} else {
rc_keyup(d->rc_dev);
}
if (key[0] != 0)
deb_info("key: %*ph\n", 5, key);
if (st->data[0] != 0)
deb_info("st->data: %*ph\n", 5, st->data);
mutex_unlock(&st->data_mutex);
return 0;
}
@ -106,17 +135,24 @@ static struct dvb_usb_device_properties wt220u_miglia_properties;
static int dtt200u_usb_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct dvb_usb_device *d;
struct dtt200u_state *st;
if (0 == dvb_usb_device_init(intf, &dtt200u_properties,
THIS_MODULE, NULL, adapter_nr) ||
THIS_MODULE, &d, adapter_nr) ||
0 == dvb_usb_device_init(intf, &wt220u_properties,
THIS_MODULE, NULL, adapter_nr) ||
THIS_MODULE, &d, adapter_nr) ||
0 == dvb_usb_device_init(intf, &wt220u_fc_properties,
THIS_MODULE, NULL, adapter_nr) ||
THIS_MODULE, &d, adapter_nr) ||
0 == dvb_usb_device_init(intf, &wt220u_zl0353_properties,
THIS_MODULE, NULL, adapter_nr) ||
THIS_MODULE, &d, adapter_nr) ||
0 == dvb_usb_device_init(intf, &wt220u_miglia_properties,
THIS_MODULE, NULL, adapter_nr))
THIS_MODULE, &d, adapter_nr)) {
st = d->priv;
mutex_init(&st->data_mutex);
return 0;
}
return -ENODEV;
}
@ -140,6 +176,8 @@ static struct dvb_usb_device_properties dtt200u_properties = {
.usb_ctrl = CYPRESS_FX2,
.firmware = "dvb-usb-dtt200u-01.fw",
.size_of_priv = sizeof(struct dtt200u_state),
.num_adapters = 1,
.adapter = {
{
@ -190,6 +228,8 @@ static struct dvb_usb_device_properties wt220u_properties = {
.usb_ctrl = CYPRESS_FX2,
.firmware = "dvb-usb-wt220u-02.fw",
.size_of_priv = sizeof(struct dtt200u_state),
.num_adapters = 1,
.adapter = {
{
@ -240,6 +280,8 @@ static struct dvb_usb_device_properties wt220u_fc_properties = {
.usb_ctrl = CYPRESS_FX2,
.firmware = "dvb-usb-wt220u-fc03.fw",
.size_of_priv = sizeof(struct dtt200u_state),
.num_adapters = 1,
.adapter = {
{
@ -290,6 +332,8 @@ static struct dvb_usb_device_properties wt220u_zl0353_properties = {
.usb_ctrl = CYPRESS_FX2,
.firmware = "dvb-usb-wt220u-zl0353-01.fw",
.size_of_priv = sizeof(struct dtt200u_state),
.num_adapters = 1,
.adapter = {
{
@ -340,6 +384,8 @@ static struct dvb_usb_device_properties wt220u_miglia_properties = {
.usb_ctrl = CYPRESS_FX2,
.firmware = "dvb-usb-wt220u-miglia-01.fw",
.size_of_priv = sizeof(struct dtt200u_state),
.num_adapters = 1,
.generic_bulk_ctrl_endpoint = 0x01,