[PATCH 4.9 108/191] media: dvb_frontend: cleanup ioctl handling logic

Sasha Levin
2020-06-29T20:25:42Z

From: Mauro Carvalho Chehab <mchehab@s-opensource.com>

commit d73dcf0cdb95a47f7e4e991ab63dd30f6eb67b4e upstream

Currently, there are two handlers for ioctls:
- dvb_frontend_ioctl_properties()
- dvb_frontend_ioctl_legacy()

Despite their names, both handles non-legacy DVB ioctls.

Besides that, there's no reason why to not handle all ioctls
on a single handler function.

So, merge them into a single function (dvb_frontend_handle_ioctl)
and reorganize the ioctl's to indicate what's the current DVB
API and what's deprecated.

Despite the big diff, the handling logic for each ioctl is the
same as before.

Reviewed-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/media/dvb-core/dvb_frontend.c | 328 +++++++++++++-------------
1 file changed, 158 insertions(+), 170 deletions(-)

diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c
index c446f51be21a9..5b06ac91420ff 100644
--- a/drivers/media/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb-core/dvb_frontend.c
@@ -1296,10 +1296,8 @@ static int dtv_get_frontend(struct dvb_frontend *fe,
return 0;
}

-static int dvb_frontend_ioctl_legacy(struct file *file,
- unsigned int cmd, void *parg);
-static int dvb_frontend_ioctl_properties(struct file *file,
- unsigned int cmd, void *parg);
+static int dvb_frontend_handle_ioctl(struct file *file,
+ unsigned int cmd, void *parg);

static int dtv_property_process_get(struct dvb_frontend *fe,
const struct dtv_frontend_properties *c,
@@ -1801,12 +1799,12 @@ static int dtv_property_process_set(struct dvb_frontend *fe,
break;
case DTV_VOLTAGE:
c->voltage = tvp->u.data;
- r = dvb_frontend_ioctl_legacy(file, FE_SET_VOLTAGE,
+ r = dvb_frontend_handle_ioctl(file, FE_SET_VOLTAGE,
(void *)c->voltage);
break;
case DTV_TONE:
c->sectone = tvp->u.data;
- r = dvb_frontend_ioctl_legacy(file, FE_SET_TONE,
+ r = dvb_frontend_handle_ioctl(file, FE_SET_TONE,
(void *)c->sectone);
break;
case DTV_CODE_RATE_HP:
@@ -1913,14 +1911,13 @@ static int dtv_property_process_set(struct dvb_frontend *fe,
return r;
}

-static int dvb_frontend_ioctl(struct file *file,
- unsigned int cmd, void *parg)
+static int dvb_frontend_ioctl(struct file *file, unsigned int cmd, void *parg)
{
struct dvb_device *dvbdev = file->private_data;
struct dvb_frontend *fe = dvbdev->priv;
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
struct dvb_frontend_private *fepriv = fe->frontend_priv;
- int err = -EOPNOTSUPP;
+ int err;

dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd));
if (down_interruptible(&fepriv->sem))
@@ -1938,121 +1935,13 @@ static int dvb_frontend_ioctl(struct file *file,
return -EPERM;
}

- if ((cmd == FE_SET_PROPERTY) || (cmd == FE_GET_PROPERTY))
- err = dvb_frontend_ioctl_properties(file, cmd, parg);
- else {
- c->state = DTV_UNDEFINED;
- err = dvb_frontend_ioctl_legacy(file, cmd, parg);
- }
+ c->state = DTV_UNDEFINED;
+ err = dvb_frontend_handle_ioctl(file, cmd, parg);

up(&fepriv->sem);
return err;
}

-static int dvb_frontend_ioctl_properties(struct file *file,
- unsigned int cmd, void *parg)
-{
- struct dvb_device *dvbdev = file->private_data;
- struct dvb_frontend *fe = dvbdev->priv;
- struct dvb_frontend_private *fepriv = fe->frontend_priv;
- struct dtv_frontend_properties *c = &fe->dtv_property_cache;
- int err, i;
-
- dev_dbg(fe->dvb->device, "%s:\n", __func__);
-
- switch(cmd) {
- case FE_SET_PROPERTY: {
- struct dtv_properties *tvps = parg;
- struct dtv_property *tvp = NULL;
-
- dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
- __func__, tvps->num);
- dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
- __func__, tvps->props);
-
- /*
- * Put an arbitrary limit on the number of messages that can
- * be sent at once
- */
- if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
- return -EINVAL;
-
- tvp = memdup_user(tvps->props, tvps->num * sizeof(*tvp));
- if (IS_ERR(tvp))
- return PTR_ERR(tvp);
-
- for (i = 0; i < tvps->num; i++) {
- err = dtv_property_process_set(fe, tvp + i, file);
- if (err < 0) {
- kfree(tvp);
- return err;
- }
- (tvp + i)->result = err;
- }
-
- if (c->state == DTV_TUNE)
- dev_dbg(fe->dvb->device, "%s: Property cache is full, tuning\n", __func__);
-
- kfree(tvp);
- break;
- }
- case FE_GET_PROPERTY: {
- struct dtv_properties *tvps = parg;
- struct dtv_property *tvp = NULL;
- struct dtv_frontend_properties getp = fe->dtv_property_cache;
-
- dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
- __func__, tvps->num);
- dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
- __func__, tvps->props);
-
- /*
- * Put an arbitrary limit on the number of messages that can
- * be sent at once
- */
- if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
- return -EINVAL;
-
- tvp = memdup_user(tvps->props, tvps->num * sizeof(*tvp));
- if (IS_ERR(tvp))
- return PTR_ERR(tvp);
-
- /*
- * Let's use our own copy of property cache, in order to
- * avoid mangling with DTV zigzag logic, as drivers might
- * return crap, if they don't check if the data is available
- * before updating the properties cache.
- */
- if (fepriv->state != FESTATE_IDLE) {
- err = dtv_get_frontend(fe, &getp, NULL);
- if (err < 0) {
- kfree(tvp);
- return err;
- }
- }
- for (i = 0; i < tvps->num; i++) {
- err = dtv_property_process_get(fe, &getp, tvp + i, file);
- if (err < 0) {
- kfree(tvp);
- return err;
- }
- (tvp + i)->result = err;
- }
-
- if (copy_to_user((void __user *)tvps->props, tvp,
- tvps->num * sizeof(struct dtv_property))) {
- kfree(tvp);
- return -EFAULT;
- }
- kfree(tvp);
- break;
- }
- default:
- return -ENOTSUPP;
- } /* switch */
- return 0;
-}
-
static int dtv_set_frontend(struct dvb_frontend *fe)
{
struct dvb_frontend_private *fepriv = fe->frontend_priv;
@@ -2190,16 +2079,105 @@ static int dtv_set_frontend(struct dvb_frontend *fe)
}

-static int dvb_frontend_ioctl_legacy(struct file *file,
- unsigned int cmd, void *parg)
+static int dvb_frontend_handle_ioctl(struct file *file,
+ unsigned int cmd, void *parg)
{
struct dvb_device *dvbdev = file->private_data;
struct dvb_frontend *fe = dvbdev->priv;
struct dvb_frontend_private *fepriv = fe->frontend_priv;
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
- int err = -EOPNOTSUPP;
+ int i, err;
+
+ dev_dbg(fe->dvb->device, "%s:\n", __func__);
+
+ switch(cmd) {
+ case FE_SET_PROPERTY: {
+ struct dtv_properties *tvps = parg;
+ struct dtv_property *tvp = NULL;
+
+ dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
+ __func__, tvps->num);
+ dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
+ __func__, tvps->props);
+
+ /*
+ * Put an arbitrary limit on the number of messages that can
+ * be sent at once
+ */
+ if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
+ return -EINVAL;
+
+ tvp = memdup_user(tvps->props, tvps->num * sizeof(*tvp));
+ if (IS_ERR(tvp))
+ return PTR_ERR(tvp);
+
+ for (i = 0; i < tvps->num; i++) {
+ err = dtv_property_process_set(fe, tvp + i, file);
+ if (err < 0) {
+ kfree(tvp);
+ return err;
+ }
+ (tvp + i)->result = err;
+ }
+
+ if (c->state == DTV_TUNE)
+ dev_dbg(fe->dvb->device, "%s: Property cache is full, tuning\n", __func__);
+
+ kfree(tvp);
+ break;
+ }
+ case FE_GET_PROPERTY: {
+ struct dtv_properties *tvps = parg;
+ struct dtv_property *tvp = NULL;
+ struct dtv_frontend_properties getp = fe->dtv_property_cache;
+
+ dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
+ __func__, tvps->num);
+ dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
+ __func__, tvps->props);
+
+ /*
+ * Put an arbitrary limit on the number of messages that can
+ * be sent at once
+ */
+ if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
+ return -EINVAL;
+
+ tvp = memdup_user(tvps->props, tvps->num * sizeof(*tvp));
+ if (IS_ERR(tvp))
+ return PTR_ERR(tvp);
+
+ /*
+ * Let's use our own copy of property cache, in order to
+ * avoid mangling with DTV zigzag logic, as drivers might
+ * return crap, if they don't check if the data is available
+ * before updating the properties cache.
+ */
+ if (fepriv->state != FESTATE_IDLE) {
+ err = dtv_get_frontend(fe, &getp, NULL);
+ if (err < 0) {
+ kfree(tvp);
+ return err;
+ }
+ }
+ for (i = 0; i < tvps->num; i++) {
+ err = dtv_property_process_get(fe, &getp, tvp + i, file);
+ if (err < 0) {
+ kfree(tvp);
+ return err;
+ }
+ (tvp + i)->result = err;
+ }
+
+ if (copy_to_user((void __user *)tvps->props, tvp,
+ tvps->num * sizeof(struct dtv_property))) {
+ kfree(tvp);
+ return -EFAULT;
+ }
+ kfree(tvp);
+ break;
+ }

- switch (cmd) {
case FE_GET_INFO: {
struct dvb_frontend_info* info = parg;

@@ -2263,42 +2241,6 @@ static int dvb_frontend_ioctl_legacy(struct file *file,
break;
}

- case FE_READ_BER:
- if (fe->ops.read_ber) {
- if (fepriv->thread)
- err = fe->ops.read_ber(fe, (__u32 *) parg);
- else
- err = -EAGAIN;
- }
- break;
-
- case FE_READ_SIGNAL_STRENGTH:
- if (fe->ops.read_signal_strength) {
- if (fepriv->thread)
- err = fe->ops.read_signal_strength(fe, (__u16 *) parg);
- else
- err = -EAGAIN;
- }
- break;
-
- case FE_READ_SNR:
- if (fe->ops.read_snr) {
- if (fepriv->thread)
- err = fe->ops.read_snr(fe, (__u16 *) parg);
- else
- err = -EAGAIN;
- }
- break;
-
- case FE_READ_UNCORRECTED_BLOCKS:
- if (fe->ops.read_ucblocks) {
- if (fepriv->thread)
- err = fe->ops.read_ucblocks(fe, (__u32 *) parg);
- else
- err = -EAGAIN;
- }
- break;
-
case FE_DISEQC_RESET_OVERLOAD:
if (fe->ops.diseqc_reset_overload) {
err = fe->ops.diseqc_reset_overload(fe);
@@ -2350,6 +2292,23 @@ static int dvb_frontend_ioctl_legacy(struct file *file,
}
break;

+ case FE_DISEQC_RECV_SLAVE_REPLY:
+ if (fe->ops.diseqc_recv_slave_reply)
+ err = fe->ops.diseqc_recv_slave_reply(fe, (struct dvb_diseqc_slave_reply*) parg);
+ break;
+
+ case FE_ENABLE_HIGH_LNB_VOLTAGE:
+ if (fe->ops.enable_high_lnb_voltage)
+ err = fe->ops.enable_high_lnb_voltage(fe, (long) parg);
+ break;
+
+ case FE_SET_FRONTEND_TUNE_MODE:
+ fepriv->tune_mode_flags = (unsigned long) parg;
+ err = 0;
+ break;
+
+ /* DEPRECATED dish control ioctls */
+
case FE_DISHNETWORK_SEND_LEGACY_CMD:
if (fe->ops.dishnetwork_send_legacy_command) {
err = fe->ops.dishnetwork_send_legacy_command(fe,
@@ -2414,16 +2373,46 @@ static int dvb_frontend_ioctl_legacy(struct file *file,
}
break;

- case FE_DISEQC_RECV_SLAVE_REPLY:
- if (fe->ops.diseqc_recv_slave_reply)
- err = fe->ops.diseqc_recv_slave_reply(fe, (struct dvb_diseqc_slave_reply*) parg);
+ /* DEPRECATED statistics ioctls */
+
+ case FE_READ_BER:
+ if (fe->ops.read_ber) {
+ if (fepriv->thread)
+ err = fe->ops.read_ber(fe, (__u32 *) parg);
+ else
+ err = -EAGAIN;
+ }
break;

- case FE_ENABLE_HIGH_LNB_VOLTAGE:
- if (fe->ops.enable_high_lnb_voltage)
- err = fe->ops.enable_high_lnb_voltage(fe, (long) parg);
+ case FE_READ_SIGNAL_STRENGTH:
+ if (fe->ops.read_signal_strength) {
+ if (fepriv->thread)
+ err = fe->ops.read_signal_strength(fe, (__u16 *) parg);
+ else
+ err = -EAGAIN;
+ }
+ break;
+
+ case FE_READ_SNR:
+ if (fe->ops.read_snr) {
+ if (fepriv->thread)
+ err = fe->ops.read_snr(fe, (__u16 *) parg);
+ else
+ err = -EAGAIN;
+ }
+ break;
+
+ case FE_READ_UNCORRECTED_BLOCKS:
+ if (fe->ops.read_ucblocks) {
+ if (fepriv->thread)
+ err = fe->ops.read_ucblocks(fe, (__u32 *) parg);
+ else
+ err = -EAGAIN;
+ }
break;

+ /* DEPRECATED DVBv3 ioctls */
+
case FE_SET_FRONTEND:
err = dvbv3_set_delivery_system(fe);
if (err)
@@ -2450,11 +2439,10 @@ static int dvb_frontend_ioctl_legacy(struct file *file,
err = dtv_get_frontend(fe, &getp, parg);
break;
}
- case FE_SET_FRONTEND_TUNE_MODE:
- fepriv->tune_mode_flags = (unsigned long) parg;
- err = 0;
- break;
- }
+
+ default:
+ return -ENOTSUPP;
+ } /* switch */

return err;
}
--
2.25.1