From 08ccbb8e0667e90e5c7334057965c6205a3855fb Mon Sep 17 00:00:00 2001 From: Andrei Koshkosh Date: Sun, 29 Sep 2019 05:04:05 -0300 Subject: [PATCH] media: dvbsky: use a single mutex and state buffers for all R/W ops commit cecf0bbbcb6f035a5ca2197f3e11ec2b7fb3da83 upstream. Re-use usb_mutex from dvb_usb_device for this. See: https://github.com/raspberrypi/linux/issues/3809 Tested-by: Jan Pieter van Woerkom Signed-off-by: Andrei Koshkosh Signed-off-by: Sean Young Signed-off-by: Mauro Carvalho Chehab --- drivers/media/usb/dvb-usb-v2/dvbsky.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) --- a/drivers/media/usb/dvb-usb-v2/dvbsky.c +++ b/drivers/media/usb/dvb-usb-v2/dvbsky.c @@ -22,7 +22,6 @@ MODULE_PARM_DESC(disable_rc, "Disable in 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 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_de if (ret) return ret; */ - mutex_init(&state->stream_mutex); state->last_lock = 0;