V4L/DVB (10058): dsbr100: fix codingstyle, add dev_err messages

We should make if-constructions more clear. Introduce int retval
variables in some functions to make it this way. Also a lot of useful
dev_err messages added. And now we check every returned value after
usb_control_msg.

Signed-off-by: Alexey Klimov <klimov.linux@gmail.com>
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 137 insertions, 47 deletions

diff --git a/drivers/media/radio/dsbr100.c b/drivers/media/radio/dsbr100.c
index e1cc369bdbd6..e0d7485226cd 100644
--- a/drivers/media/radio/dsbr100.c
+++ b/drivers/media/radio/dsbr100.c
@@ -197,86 +197,169 @@ static struct usb_driver usb_dsbr100_driver = {
 /* switch on radio */
 static int dsbr100_start(struct dsbr100_device *radio)
 {
+        int retval;
+        int request;
+
         mutex_lock(&radio->lock);
-        if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
-                        USB_REQ_GET_STATUS,
-                        USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
-                        0x00, 0xC7, radio->transfer_buffer, 8, 300) < 0 ||
-        usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
-                        DSB100_ONOFF,
-                        USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
-                        0x01, 0x00, radio->transfer_buffer, 8, 300) < 0) {
-                mutex_unlock(&radio->lock);
-                return -1;
+
+        retval = usb_control_msg(radio->usbdev,
+                usb_rcvctrlpipe(radio->usbdev, 0),
+                USB_REQ_GET_STATUS,
+                USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
+                0x00, 0xC7, radio->transfer_buffer, 8, 300);
+
+        if (retval < 0) {
+                request = USB_REQ_GET_STATUS;
+                goto usb_control_msg_failed;
         }
 
-        radio->muted=0;
+        retval = usb_control_msg(radio->usbdev,
+                usb_rcvctrlpipe(radio->usbdev, 0),
+                DSB100_ONOFF,
+                USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
+                0x01, 0x00, radio->transfer_buffer, 8, 300);
+
+        if (retval < 0) {
+                request = DSB100_ONOFF;
+                goto usb_control_msg_failed;
+        }
+
+        radio->muted = 0;
         mutex_unlock(&radio->lock);
         return (radio->transfer_buffer)[0];
+
+usb_control_msg_failed:
+        mutex_unlock(&radio->lock);
+        dev_err(&radio->usbdev->dev,
+                "%s - usb_control_msg returned %i, request %i\n",
+                        __func__, retval, request);
+        return -1;
+
 }
 
 
 /* switch off radio */
 static int dsbr100_stop(struct dsbr100_device *radio)
 {
+        int retval;
+        int request;
+
         mutex_lock(&radio->lock);
-        if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
-                        USB_REQ_GET_STATUS,
-                        USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
-                        0x16, 0x1C, radio->transfer_buffer, 8, 300) < 0 ||
-        usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
-                        DSB100_ONOFF,
-                        USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
-                        0x00, 0x00, radio->transfer_buffer, 8, 300) < 0) {
-                mutex_unlock(&radio->lock);
-                return -1;
+
+        retval = usb_control_msg(radio->usbdev,
+                usb_rcvctrlpipe(radio->usbdev, 0),
+                USB_REQ_GET_STATUS,
+                USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
+                0x16, 0x1C, radio->transfer_buffer, 8, 300);
+
+        if (retval < 0) {
+                request = USB_REQ_GET_STATUS;
+                goto usb_control_msg_failed;
+        }
+
+        retval = usb_control_msg(radio->usbdev,
+                usb_rcvctrlpipe(radio->usbdev, 0),
+                DSB100_ONOFF,
+                USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
+                0x00, 0x00, radio->transfer_buffer, 8, 300);
+
+        if (retval < 0) {
+                request = DSB100_ONOFF;
+                goto usb_control_msg_failed;
         }
 
-        radio->muted=1;
+        radio->muted = 1;
         mutex_unlock(&radio->lock);
         return (radio->transfer_buffer)[0];
+
+usb_control_msg_failed:
+        mutex_unlock(&radio->lock);
+        dev_err(&radio->usbdev->dev,
+                "%s - usb_control_msg returned %i, request %i\n",
+                        __func__, retval, request);
+        return -1;
+
 }
 
 /* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
 static int dsbr100_setfreq(struct dsbr100_device *radio, int freq)
 {
+        int retval;
+        int request;
+
         freq = (freq / 16 * 80) / 1000 + 856;
         mutex_lock(&radio->lock);
-        if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
-                        DSB100_TUNE,
-                        USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
-                        (freq >> 8) & 0x00ff, freq & 0xff,
-                        radio->transfer_buffer, 8, 300) < 0 ||
-           usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
-                        USB_REQ_GET_STATUS,
-                        USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
-                        0x96, 0xB7, radio->transfer_buffer, 8, 300) < 0 ||
-        usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
-                        USB_REQ_GET_STATUS,
-                        USB_TYPE_VENDOR | USB_RECIP_DEVICE |  USB_DIR_IN,
-                        0x00, 0x24, radio->transfer_buffer, 8, 300) < 0) {
-                radio->stereo = -1;
-                mutex_unlock(&radio->lock);
-                return -1;
+
+        retval = usb_control_msg(radio->usbdev,
+                usb_rcvctrlpipe(radio->usbdev, 0),
+                DSB100_TUNE,
+                USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
+                (freq >> 8) & 0x00ff, freq & 0xff,
+                radio->transfer_buffer, 8, 300);
+
+        if (retval < 0) {
+                request = DSB100_TUNE;
+                goto usb_control_msg_failed;
+        }
+
+        retval = usb_control_msg(radio->usbdev,
+                usb_rcvctrlpipe(radio->usbdev, 0),
+                USB_REQ_GET_STATUS,
+                USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
+                0x96, 0xB7, radio->transfer_buffer, 8, 300);
+
+        if (retval < 0) {
+                request = USB_REQ_GET_STATUS;
+                goto usb_control_msg_failed;
+        }
+
+        retval = usb_control_msg(radio->usbdev,
+                usb_rcvctrlpipe(radio->usbdev, 0),
+                USB_REQ_GET_STATUS,
+                USB_TYPE_VENDOR | USB_RECIP_DEVICE |  USB_DIR_IN,
+                0x00, 0x24, radio->transfer_buffer, 8, 300);
+
+        if (retval < 0) {
+                request = USB_REQ_GET_STATUS;
+                goto usb_control_msg_failed;
         }
 
         radio->stereo = !((radio->transfer_buffer)[0] & 0x01);
         mutex_unlock(&radio->lock);
         return (radio->transfer_buffer)[0];
+
+usb_control_msg_failed:
+        radio->stereo = -1;
+        mutex_unlock(&radio->lock);
+        dev_err(&radio->usbdev->dev,
+                "%s - usb_control_msg returned %i, request %i\n",
+                        __func__, retval, request);
+        return -1;
 }
 
 /* return the device status.  This is, in effect, just whether it
 sees a stereo signal or not.  Pity. */
 static void dsbr100_getstat(struct dsbr100_device *radio)
 {
+        int retval;
+
         mutex_lock(&radio->lock);
-        if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
+
+        retval = usb_control_msg(radio->usbdev,
+                usb_rcvctrlpipe(radio->usbdev, 0),
                 USB_REQ_GET_STATUS,
                 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
-                0x00 , 0x24, radio->transfer_buffer, 8, 300) < 0)
+                0x00 , 0x24, radio->transfer_buffer, 8, 300);
+
+        if (retval < 0) {
                 radio->stereo = -1;
-        else
+                dev_err(&radio->usbdev->dev,
+                        "%s - usb_control_msg returned %i, request %i\n",
+                                __func__, retval, USB_REQ_GET_STATUS);
+        } else {
                 radio->stereo = !(radio->transfer_buffer[0] & 0x01);
+        }
+
         mutex_unlock(&radio->lock);
 }
 
@@ -358,13 +441,15 @@ static int vidioc_s_frequency(struct file *file, void *priv,
                                 struct v4l2_frequency *f)
 {
         struct dsbr100_device *radio = video_drvdata(file);
+        int retval;
 
         /* safety check */
         if (radio->removed)
                 return -EIO;
 
         radio->curfreq = f->frequency;
-        if (dsbr100_setfreq(radio, radio->curfreq) == -1)
+        retval = dsbr100_setfreq(radio, radio->curfreq);
+        if (retval == -1)
                 dev_warn(&radio->usbdev->dev, "Set frequency failed\n");
         return 0;
 }
@@ -418,6 +503,7 @@ static int vidioc_s_ctrl(struct file *file, void *priv,
                                 struct v4l2_control *ctrl)
 {
         struct dsbr100_device *radio = video_drvdata(file);
+        int retval;
 
         /* safety check */
         if (radio->removed)
@@ -426,13 +512,15 @@ static int vidioc_s_ctrl(struct file *file, void *priv,
         switch (ctrl->id) {
         case V4L2_CID_AUDIO_MUTE:
                 if (ctrl->value) {
-                        if (dsbr100_stop(radio) == -1) {
+                        retval = dsbr100_stop(radio);
+                        if (retval == -1) {
                                 dev_warn(&radio->usbdev->dev,
                                          "Radio did not respond properly\n");
                                 return -EBUSY;
                         }
                 } else {
-                        if (dsbr100_start(radio) == -1) {
+                        retval = dsbr100_start(radio);
+                        if (retval == -1) {
                                 dev_warn(&radio->usbdev->dev,
                                          "Radio did not respond properly\n");
                                 return -EBUSY;
@@ -484,7 +572,8 @@ static int usb_dsbr100_open(struct inode *inode, struct file *file)
         radio->users = 1;
         radio->muted = 1;
 
-        if (dsbr100_start(radio) < 0) {
+        retval = dsbr100_start(radio);
+        if (retval < 0) {
                 dev_warn(&radio->usbdev->dev,
                          "Radio did not start up properly\n");
                 radio->users = 0;
@@ -493,7 +582,6 @@ static int usb_dsbr100_open(struct inode *inode, struct file *file)
         }
 
         retval = dsbr100_setfreq(radio, radio->curfreq);
-
         if (retval == -1)
                 dev_warn(&radio->usbdev->dev,
                         "set frequency failed\n");
@@ -601,6 +689,7 @@ static int usb_dsbr100_probe(struct usb_interface *intf,
                                 const struct usb_device_id *id)
 {
         struct dsbr100_device *radio;
+        int retval;
 
         radio = kmalloc(sizeof(struct dsbr100_device), GFP_KERNEL);
 
@@ -622,7 +711,8 @@ static int usb_dsbr100_probe(struct usb_interface *intf,
         radio->usbdev = interface_to_usbdev(intf);
         radio->curfreq = FREQ_MIN * FREQ_MUL;
         video_set_drvdata(&radio->videodev, radio);
-        if (video_register_device(&radio->videodev, VFL_TYPE_RADIO, radio_nr) < 0) {
+        retval = video_register_device(&radio->videodev, VFL_TYPE_RADIO, radio_nr);
+        if (retval < 0) {
                 dev_warn(&intf->dev, "Could not register video device\n");
                 kfree(radio->transfer_buffer);
                 kfree(radio);