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V4L/DVB (12685): dvb-core: check fe->ops.set_frontend return value 

Various frontend driver have parameter checks in their set_frontend
functions and return an error if the parameters are not supported,
tda10021 and cx24116 to name two.

The tuning ioctls FE_SET_FRONTEND/FE_SET_PROPERTY only change values
in the property cache and return before set_frontend is called. If a
set_frontend call in software zigzag algorithm fails and the card was
previously locked it will report a lock and the new parameters but is
still tuned to the old transport. This is not detectable from
userspace.

This change checks the return values of fe->ops.set_frontend and
changes the state to the added FESTATE_ERROR for software zigzag.
No lock will be reported to userspace if the State is FESTATE_ERROR.

Signed-off-by: Janne Grunau <j@jannau.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Janne Grunau 2009-09-01 19:23:09 -03:00 committed by Mauro Carvalho Chehab
parent 4457ef1d61
commit 01886255dd
1 changed files with 21 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
drivers/media/dvb/dvb-core/dvb_frontend.c
View File

@ -72,6 +72,7 @@ MODULE_PARM_DESC(dvb_mfe_wait_time, "Wait up to <mfe_wait_time> seconds on open(
#define FESTATE_ZIGZAG_FAST 32
#define FESTATE_ZIGZAG_SLOW 64
#define FESTATE_DISEQC 128
#define FESTATE_ERROR 256
#define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC)
#define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST)
#define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW)
@ -269,6 +270,7 @@ static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wra
{
int autoinversion;
int ready = 0;
int fe_set_err = 0;
struct dvb_frontend_private *fepriv = fe->frontend_priv;
int original_inversion = fepriv->parameters.inversion;
u32 original_frequency = fepriv->parameters.frequency;
@ -345,7 +347,11 @@ static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wra
if (autoinversion)
fepriv->parameters.inversion = fepriv->inversion;
if (fe->ops.set_frontend)
fe->ops.set_frontend(fe, &fepriv->parameters);
fe_set_err = fe->ops.set_frontend(fe, &fepriv->parameters);
if (fe_set_err < 0) {
fepriv->state = FESTATE_ERROR;
return fe_set_err;
}
fepriv->parameters.frequency = original_frequency;
fepriv->parameters.inversion = original_inversion;
@ -357,6 +363,7 @@ static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wra
static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
{
fe_status_t s = 0;
int retval = 0;
struct dvb_frontend_private *fepriv = fe->frontend_priv;
/* if we've got no parameters, just keep idling */
@ -370,8 +377,12 @@ static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
if (fepriv->state & FESTATE_RETUNE) {
if (fe->ops.set_frontend)
fe->ops.set_frontend(fe, &fepriv->parameters);
fepriv->state = FESTATE_TUNED;
retval = fe->ops.set_frontend(fe,
&fepriv->parameters);
if (retval < 0)
fepriv->state = FESTATE_ERROR;
else
fepriv->state = FESTATE_TUNED;
}
fepriv->delay = 3*HZ;
fepriv->quality = 0;
@ -449,7 +460,11 @@ static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
fepriv->delay = fepriv->min_delay;
/* peform a tune */
if (dvb_frontend_swzigzag_autotune(fe, fepriv->check_wrapped)) {
retval = dvb_frontend_swzigzag_autotune(fe,
fepriv->check_wrapped);
if (retval < 0) {
return;
} else if (retval) {
/* OK, if we've run out of trials at the fast speed.
* Drop back to slow for the _next_ attempt */
fepriv->state = FESTATE_SEARCHING_SLOW;
@ -1499,7 +1514,8 @@ static int dvb_frontend_ioctl_legacy(struct inode *inode, struct file *file,
/* if retune was requested but hasn't occured yet, prevent
* that user get signal state from previous tuning */
if(fepriv->state == FESTATE_RETUNE) {
if (fepriv->state == FESTATE_RETUNE ||
fepriv->state == FESTATE_ERROR) {
err=0;
*status = 0;
break;