linux-kernel - Re: Problem with VMAP

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Message-ID: <20161005182945.nkpphvd6wtk6kq7h@linuxtv.org>
Date:   Wed, 5 Oct 2016 20:29:45 +0200
From:   Johannes Stezenbach <js@...uxtv.org>
To:     Mauro Carvalho Chehab <mchehab@...pensource.com>
Cc:     Jiri Kosina <jikos@...nel.org>,
        Patrick Boettcher <patrick.boettcher@...teo.de>,
        Jörg Otte <jrg.otte@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Michael Krufky <mkrufky@...uxtv.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>
Subject: Re: Problem with VMAP_STACK=y

On Wed, Oct 05, 2016 at 06:04:50AM -0300, Mauro Carvalho Chehab wrote:
>  static int cinergyt2_frontend_attach(struct dvb_usb_adapter *adap)
>  {
> -	char query[] = { CINERGYT2_EP1_GET_FIRMWARE_VERSION };
> -	char state[3];
> +	struct dvb_usb_device *d = adap->dev;
> +	struct cinergyt2_state *st = d->priv;
>  	int ret;
>  
>  	adap->fe_adap[0].fe = cinergyt2_fe_attach(adap->dev);
>  
> -	ret = dvb_usb_generic_rw(adap->dev, query, sizeof(query), state,
> -				sizeof(state), 0);

it seems to miss this:

	st->data[0] = CINERGYT2_EP1_GET_FIRMWARE_VERSION;

> +	ret = dvb_usb_generic_rw(d, st->data, 1, st->data, 3, 0);
>  	if (ret < 0) {
>  		deb_rc("cinergyt2_power_ctrl() Failed to retrieve sleep "
>  			"state info\n");
> @@ -141,13 +147,14 @@ static int repeatable_keys[] = {
>  static int cinergyt2_rc_query(struct dvb_usb_device *d, u32 *event, int *state)
>  {
>  	struct cinergyt2_state *st = d->priv;
> -	u8 key[5] = {0, 0, 0, 0, 0}, cmd = CINERGYT2_EP1_GET_RC_EVENTS;
>  	int i;
>  
>  	*state = REMOTE_NO_KEY_PRESSED;
>  
> -	dvb_usb_generic_rw(d, &cmd, 1, key, sizeof(key), 0);
> -	if (key[4] == 0xff) {
> +	st->data[0] = CINERGYT2_EP1_SLEEP_MODE;

should probably be

	st->data[0] = CINERGYT2_EP1_GET_RC_EVENTS;

> +
> +	dvb_usb_generic_rw(d, st->data, 1, st->data, 5, 0);


HTH,
Johannes