[PATCH 1/6] media: dvb_frontend: cleanup dvb_frontend_ioctl_properties()

* [PATCH 1/6] media: dvb_frontend: cleanup dvb_frontend_ioctl_properties()
@ 2017-09-19 13:42 Mauro Carvalho Chehab
  2017-09-19 13:42 ` [PATCH 2/6] media: dvb_frontend: cleanup ioctl handling logic Mauro Carvalho Chehab
                   ` (5 more replies)
  0 siblings, 6 replies; 12+ messages in thread
From: Mauro Carvalho Chehab @ 2017-09-19 13:42 UTC (permalink / raw)
  To: Linux Media Mailing List
  Cc: Mauro Carvalho Chehab, Mauro Carvalho Chehab, Max Kellermann,
	Shuah Khan, Colin Ian King

Use a switch() on this function, just like on other ioctl
handlers and handle parameters inside each part of the
switch.

That makes it easier to integrate with the already existing
ioctl handler function.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
---
 drivers/media/dvb-core/dvb_frontend.c | 83 +++++++++++++++++++++--------------
 1 file changed, 51 insertions(+), 32 deletions(-)

diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c
index 8abe4f541a36..725cb1c8a088 100644
--- a/drivers/media/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb-core/dvb_frontend.c
@@ -1971,21 +1971,25 @@ static int dvb_frontend_ioctl_properties(struct file *file,
 	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 = 0;
-
-	struct dtv_properties *tvps = parg;
-	struct dtv_property *tvp = NULL;
-	int i;
+	int err, i;
 
 	dev_dbg(fe->dvb->device, "%s:\n", __func__);
 
-	if (cmd == FE_SET_PROPERTY) {
-		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);
+	switch(cmd) {
+	case FE_SET_PROPERTY: {
+		struct dtv_properties *tvps = parg;
+		struct dtv_property *tvp = NULL;
 
-		/* Put an arbitrary limit on the number of messages that can
-		 * be sent at once */
-		if ((tvps->num == 0) || (tvps->num > DTV_IOCTL_MAX_MSGS))
+		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));
@@ -1994,23 +1998,34 @@ static int dvb_frontend_ioctl_properties(struct file *file,
 
 		for (i = 0; i < tvps->num; i++) {
 			err = dtv_property_process_set(fe, tvp + i, file);
-			if (err < 0)
-				goto out;
+			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__);
 
-	} else if (cmd == FE_GET_PROPERTY) {
+		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);
+		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 == 0) || (tvps->num > DTV_IOCTL_MAX_MSGS))
+		/*
+		 * 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));
@@ -2025,28 +2040,32 @@ static int dvb_frontend_ioctl_properties(struct file *file,
 		 */
 		if (fepriv->state != FESTATE_IDLE) {
 			err = dtv_get_frontend(fe, &getp, NULL);
-			if (err < 0)
-				goto out;
+			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)
-				goto out;
+			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))) {
-			err = -EFAULT;
-			goto out;
+			kfree(tvp);
+			return -EFAULT;
 		}
-
-	} else
-		err = -EOPNOTSUPP;
-
-out:
-	kfree(tvp);
-	return err;
+		kfree(tvp);
+		break;
+	}
+	default:
+		return -ENOTSUPP;
+	} /* switch */
+	return 0;
 }
 
 static int dtv_set_frontend(struct dvb_frontend *fe)
-- 
2.13.5

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