V4L/DVB (6642): xc2028: don't duplicate max_len in priv

There is no need to duplicate the max_len field from the ctrl structure
in the private data.  If we use it directly from priv->ctrl, we can memcpy
the structure (apart from strings) to reduce maintenance as it grows.

Enforce a minimum max_len length of 8 data bytes (+ 1 address byte) as seems
to be required by the tuner.

Also, use kstrdup instead of open coding the string duplication.

Signed-off-by: Chris Pascoe <c.pascoe@itee.uq.edu.au>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 16 insertions, 21 deletions

diff --git a/drivers/media/video/tuner-xc2028.c b/drivers/media/video/tuner-xc2028.c
index c921d6009a8b..e19449603d73 100644
--- a/drivers/media/video/tuner-xc2028.c
+++ b/drivers/media/video/tuner-xc2028.c
@@ -75,9 +75,6 @@ struct xc2028_data {
                                                               6M, 7M or 8M */
         int                     need_load_generic; /* The generic firmware
                                                               were loaded? */
-
-        int                     max_len;        /* Max firmware chunk */
-
         enum tuner_mode mode;
         struct i2c_client       *i2c_client;
 
@@ -426,7 +423,7 @@ static int load_firmware(struct dvb_frontend *fe, unsigned int type,
 {
         struct xc2028_data *priv = fe->tuner_priv;
         int                pos, rc;
-        unsigned char      *p, *endp, buf[priv->max_len];
+        unsigned char      *p, *endp, buf[priv->ctrl.max_len];
 
         tuner_dbg("%s called\n", __FUNCTION__);
 
@@ -505,8 +502,8 @@ static int load_firmware(struct dvb_frontend *fe, unsigned int type,
 
                 /* Sends message chunks */
                 while (size > 0) {
-                        int len = (size < priv->max_len - 1) ?
-                                   size : priv->max_len - 1;
+                        int len = (size < priv->ctrl.max_len - 1) ?
+                                   size : priv->ctrl.max_len - 1;
 
                         memcpy(buf + 1, p, len);
 
@@ -881,32 +878,30 @@ static int xc2028_set_config(struct dvb_frontend *fe, void *priv_cfg)
 {
         struct xc2028_data *priv = fe->tuner_priv;
         struct xc2028_ctrl *p    = priv_cfg;
+        int                 rc   = 0;
 
         tuner_dbg("%s called\n", __FUNCTION__);
 
         mutex_lock(&priv->lock);
 
-        priv->ctrl.type = p->type;
-
-        if (p->fname) {
-                kfree(priv->ctrl.fname);
+        kfree(priv->ctrl.fname);
+        free_firmware(priv);
 
-                priv->ctrl.fname = kmalloc(strlen(p->fname) + 1, GFP_KERNEL);
-                if (priv->ctrl.fname == NULL) {
-                        mutex_unlock(&priv->lock);
-                        return -ENOMEM;
-                }
+        memcpy(&priv->ctrl, p, sizeof(priv->ctrl));
+        priv->ctrl.fname = NULL;
 
-                free_firmware(priv);
-                strcpy(priv->ctrl.fname, p->fname);
+        if (p->fname) {
+                priv->ctrl.fname = kstrdup(p->fname, GFP_KERNEL);
+                if (priv->ctrl.fname == NULL)
+                        rc = -ENOMEM;
         }
 
-        if (p->max_len > 0)
-                priv->max_len = p->max_len;
+        if (priv->ctrl.max_len < 9)
+                priv->ctrl.max_len = 13;
 
         mutex_unlock(&priv->lock);
 
-        return 0;
+        return rc;
 }
 
 static const struct dvb_tuner_ops xc2028_dvb_tuner_ops = {
@@ -967,7 +962,7 @@ void *xc2028_attach(struct dvb_frontend *fe, struct xc2028_config *cfg)
                 priv->i2c_props.adap = cfg->i2c_adap;
                 priv->video_dev = video_dev;
                 priv->tuner_callback = cfg->callback;
-                priv->max_len = 13;
+                priv->ctrl.max_len = 13;
 
                 mutex_init(&priv->lock);