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media: dvbsky: use just one mutex for serializing device R/W ops 

Right now, there are two mutexes serializing r/w ops: one "generic"
and another one specifically for stream on/off.

Clean it a little bit, getting rid of one of the mutexes.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Mauro Carvalho Chehab 2018-04-27 12:33:11 -04:00
parent 3b7158d61a
commit 7d95fb746c
1 changed files with 6 additions and 10 deletions
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16
drivers/media/usb/dvb-usb-v2/dvbsky.c
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@ -31,7 +31,6 @@ 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;
@ -68,18 +67,17 @@ 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);
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);
ret = dvb_usbv2_generic_rw_locked(d, obuf_pre, 3, NULL, 0);
if (!ret && onoff) {
msleep(20);
ret = dvbsky_usb_generic_rw(d, obuf_post, 3, NULL, 0);
ret = dvb_usbv2_generic_rw_locked(d, obuf_post, 3, NULL, 0);
}
mutex_unlock(&state->stream_mutex);
mutex_unlock(&d->usb_mutex);
return ret;
}
@ -608,8 +606,6 @@ static int dvbsky_init(struct dvb_usb_device *d)
if (ret)
return ret;
*/
mutex_init(&state->stream_mutex);
state->last_lock = 0;
return 0;