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

Re-use usb_mutex from dvb_usb_device for this.

Tested-by: Jan Pieter van Woerkom <jp@jpvw.nl>
Signed-off-by: Andrei Koshkosh <andreykosh000@mail.ru>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Andrei Koshkosh 2019-09-29 05:04:05 -03:00 committed by Mauro Carvalho Chehab
parent 767f22ac54
commit cecf0bbbcb
1 changed files with 8 additions and 8 deletions
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16
drivers/media/usb/dvb-usb-v2/dvbsky.c
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@ -22,7 +22,6 @@ MODULE_PARM_DESC(disable_rc, "Disable inbuilt IR receiver.");
DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
struct dvbsky_state {
struct mutex stream_mutex;
u8 ibuf[DVBSKY_BUF_LEN];
u8 obuf[DVBSKY_BUF_LEN];
u8 last_lock;
@ -60,17 +59,19 @@ static int dvbsky_usb_generic_rw(struct dvb_usb_device *d,
static int dvbsky_stream_ctrl(struct dvb_usb_device *d, u8 onoff)
{
struct dvbsky_state *state = d_to_priv(d);
static const u8 obuf_pre[3] = { 0x37, 0, 0 };
static const u8 obuf_post[3] = { 0x36, 3, 0 };
int ret;
u8 obuf_pre[3] = { 0x37, 0, 0 };
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;
}
@ -598,7 +599,6 @@ static int dvbsky_init(struct dvb_usb_device *d)
if (ret)
return ret;
*/
mutex_init(&state->stream_mutex);
state->last_lock = 0;