From 7d95fb746c4eece67308f1642a666ea1ebdbd2cc Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Fri, 27 Apr 2018 12:33:11 -0400 Subject: [PATCH] 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 --- drivers/media/usb/dvb-usb-v2/dvbsky.c | 16 ++++++---------- 1 file changed, 6 insertions(+), 10 deletions(-) diff --git a/drivers/media/usb/dvb-usb-v2/dvbsky.c b/drivers/media/usb/dvb-usb-v2/dvbsky.c index e28bd88..1aa88d9 100644 --- a/drivers/media/usb/dvb-usb-v2/dvbsky.c +++ b/drivers/media/usb/dvb-usb-v2/dvbsky.c @@ -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; -- 2.7.4