I think I've found the problem:
------------------------------------------------------------------------
static int cinergyt2_fe_set_frontend(struct dvb_frontend *fe,
struct dvb_frontend_parameters *fep)
{
struct cinergyt2_fe_state *state = fe->demodulator_priv;
struct dvbt_set_parameters_msg param;
char result[2];
int err;
param.cmd = CINERGYT2_EP1_SET_TUNER_PARAMETERS;
param.tps = cpu_to_le16(compute_tps(fep));
param.freq = cpu_to_le32(fep->frequency / 1000);
param.bandwidth = 8 - fep->u.ofdm.bandwidth - BANDWIDTH_8_MHZ;
err = dvb_usb_generic_rw(state->d,
(char *)¶m, sizeof(param),
result, sizeof(result), 0);
------------------------------------------------------------------------
As dvbt_set_parameters_msg is declared with __attribute__((packed)), its
alignment is 8 bits. In fact, cinergyt2_fe_set_frontend()'s param variable
is not aligned on a 32-bit boundary. Note that param is passed to usb_bulk_msg().
This seems to cause DMA problems on my hardware (Atom N270 + 945GSE + ICH7M).
I hope that I'm not talking to a black hole.
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