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media: dvbsky: use a single mutex and state buffers for all R/W ops #689

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media: dvbsky: use a single mutex and state buffers for all R/W ops #689

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18 changes: 10 additions & 8 deletions drivers/media/usb/dvb-usb-v2/dvbsky.c
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,7 @@ MODULE_PARM_DESC(disable_rc, "Disable inbuilt IR receiver.");
DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);

struct dvbsky_state {
struct mutex stream_mutex;
//struct mutex stream_mutex;
u8 ibuf[DVBSKY_BUF_LEN];
u8 obuf[DVBSKY_BUF_LEN];
u8 last_lock;
Expand Down Expand Up @@ -61,16 +61,18 @@ static int dvbsky_stream_ctrl(struct dvb_usb_device *d, u8 onoff)
{
struct dvbsky_state *state = d_to_priv(d);
int ret;
u8 obuf_pre[3] = { 0x37, 0, 0 };
u8 obuf_post[3] = { 0x36, 3, 0 };
static u8 obuf_pre[3] = { 0x37, 0, 0 };
static u8 obuf_post[3] = { 0x36, 3, 0 };

mutex_lock(&state->stream_mutex);
ret = dvbsky_usb_generic_rw(d, obuf_pre, 3, NULL, 0);
mutex_lock(&d->usb_mutex);
memcpy(state->obuf, obuf_pre, 3);
ret = dvb_usbv2_generic_write_locked(d, state->obuf, 3);
if (!ret && onoff) {
msleep(20);
ret = dvbsky_usb_generic_rw(d, obuf_post, 3, NULL, 0);
memcpy(state->obuf, obuf_post, 3);
ret = dvb_usbv2_generic_write_locked(d, state->obuf, 3);
}
mutex_unlock(&state->stream_mutex);
mutex_unlock(&d->usb_mutex);
return ret;
}

Expand Down Expand Up @@ -599,7 +601,7 @@ static int dvbsky_init(struct dvb_usb_device *d)
if (ret)
return ret;
*/
mutex_init(&state->stream_mutex);
//mutex_init(&state->stream_mutex);

state->last_lock = 0;

Expand Down