From: JP <jp@jpvw.nl>
To: Andrei Koshkosh <andreykosh000@mail.ru>,
Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: linux-media@vger.kernel.org, "Sean Young" <sean@mess.org>,
"Stefan Brüns" <stefan.bruens@rwth-aachen.de>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/1] media: dvbsky: use a single mutex and state buffers for all R/W ops
Date: Sun, 29 Sep 2019 23:40:16 +0200 [thread overview]
Message-ID: <fa7cfdba-42b3-bcc2-7e61-f4108c07529d@jpvw.nl> (raw)
In-Reply-To: <1569744245-23030-1-git-send-email-andreykosh000@mail.ru>
This works very well for me.
(and please see unrelated comment below)
On 9/29/19 10:04 AM, Andrei Koshkosh wrote:
> Signed-off-by: Andrei Koshkosh <andreykosh000@mail.ru>
> ---
> drivers/media/usb/dvb-usb-v2/dvbsky.c | 16 ++++++++--------
> 1 file changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/media/usb/dvb-usb-v2/dvbsky.c b/drivers/media/usb/dvb-usb-v2/dvbsky.c
> index c41e10b..6a118a0 100644
> --- 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 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;
> @@ -61,16 +60,18 @@ 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;
> }
>
> @@ -599,7 +600,6 @@ static int dvbsky_init(struct dvb_usb_device *d)
> if (ret)
> return ret;
> */
commented-out code has call to non-existing function.
> - mutex_init(&state->stream_mutex);
>
> state->last_lock = 0;
>
Thanks,
Jan Pieter.
next prev parent reply other threads:[~2019-09-29 22:07 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-29 8:04 [PATCH 1/1] media: dvbsky: use a single mutex and state buffers for all R/W ops Andrei Koshkosh
2019-09-29 21:40 ` JP [this message]
2019-11-08 18:15 Andrei Koshkosh
2019-11-08 18:22 ` Brüns, Stefan
2019-11-08 19:15 ` JP
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