V4L/DVB (7398): Adds an error if priv argument of tuner_callback is NULL

Adds a consistency check to avoid OOPS, if tuner_callback priv argument is
NULL. Also, simplifies callback codes on cx88.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

diff --git a/drivers/media/video/cx88/cx88-cards.c b/drivers/media/video/cx88/cx88-cards.c
index 603b366..6b83e34 100644 (file)
--- a/drivers/media/video/cx88/cx88-cards.c
+++ b/drivers/media/video/cx88/cx88-cards.c
@@ -2090,11 +2090,9 @@ static void gdi_eeprom(struct cx88_core *core, u8 *eeprom_data)
 
 /* ------------------------------------------------------------------- */
 /* some Divco specific stuff                                           */
-static int cx88_dvico_xc2028_callback(void *priv, int command, int arg)
+static int cx88_dvico_xc2028_callback(struct cx88_core *core,
+                                     int command, int arg)
 {
-       struct i2c_algo_bit_data *i2c_algo = priv;
-       struct cx88_core *core = i2c_algo->data;
-
        switch (command) {
        case XC2028_TUNER_RESET:
                cx_write(MO_GP0_IO, 0x101000);
@@ -2112,11 +2110,9 @@ static int cx88_dvico_xc2028_callback(void *priv, int command, int arg)
 /* ----------------------------------------------------------------------- */
 /* some Geniatech specific stuff                                           */
 
-static int cx88_xc3028_geniatech_tuner_callback(void *priv, int command, int mode)
+static int cx88_xc3028_geniatech_tuner_callback(struct cx88_core *core,
+                                               int command, int mode)
 {
-       struct i2c_algo_bit_data *i2c_algo = priv;
-       struct cx88_core *core = i2c_algo->data;
-
        switch (command) {
        case XC2028_TUNER_RESET:
                switch (INPUT(core->input).type) {
@@ -2143,11 +2139,9 @@ static int cx88_xc3028_geniatech_tuner_callback(void *priv, int command, int mod
 
 /* ------------------------------------------------------------------- */
 /* some Divco specific stuff                                           */
-static int cx88_pv_8000gt_callback(void *priv, int command, int arg)
+static int cx88_pv_8000gt_callback(struct cx88_core *core,
+                                  int command, int arg)
 {
-       struct i2c_algo_bit_data *i2c_algo = priv;
-       struct cx88_core *core = i2c_algo->data;
-
        switch (command) {
        case XC2028_TUNER_RESET:
                cx_write(MO_GP2_IO, 0xcf7);
@@ -2198,21 +2192,20 @@ static void dvico_fusionhdtv_hybrid_init(struct cx88_core *core)
        }
 }
 
-static int cx88_xc2028_tuner_callback(void *priv, int command, int arg)
+static int cx88_xc2028_tuner_callback(struct cx88_core *core,
+                                     int command, int arg)
 {
-       struct i2c_algo_bit_data *i2c_algo = priv;
-       struct cx88_core *core = i2c_algo->data;
-
        /* Board-specific callbacks */
        switch (core->boardnr) {
        case CX88_BOARD_WINFAST_TV2000_XP_GLOBAL:
        case CX88_BOARD_POWERCOLOR_REAL_ANGEL:
        case CX88_BOARD_GENIATECH_X8000_MT:
-               return cx88_xc3028_geniatech_tuner_callback(priv, command, arg);
+               return cx88_xc3028_geniatech_tuner_callback(core,
+                                                       command, arg);
        case CX88_BOARD_PROLINK_PV_8000GT:
-               return cx88_pv_8000gt_callback(priv, command, arg);
+               return cx88_pv_8000gt_callback(core, command, arg);
        case CX88_BOARD_DVICO_FUSIONHDTV_DVB_T_PRO:
-               return cx88_dvico_xc2028_callback(priv, command, arg);
+               return cx88_dvico_xc2028_callback(core, command, arg);
        }
 
        switch (command) {
@@ -2246,11 +2239,9 @@ static int cx88_xc2028_tuner_callback(void *priv, int command, int arg)
  * PCTV HD 800i with an xc5000 sillicon tuner. This is used for both      *
  * analog tuner attach (tuner-core.c) and dvb tuner attach (cx88-dvb.c)    */
 
-static int cx88_xc5000_tuner_callback(void *priv, int command, int arg)
+static int cx88_xc5000_tuner_callback(struct cx88_core *core,
+                                     int command, int arg)
 {
-       struct i2c_algo_bit_data *i2c_algo = priv;
-       struct cx88_core *core = i2c_algo->data;
-
        switch (core->boardnr) {
        case CX88_BOARD_PINNACLE_PCTV_HD_800i:
                if (command == 0) { /* This is the reset command from xc5000 */
@@ -2284,15 +2275,27 @@ static int cx88_xc5000_tuner_callback(void *priv, int command, int arg)
 int cx88_tuner_callback(void *priv, int command, int arg)
 {
        struct i2c_algo_bit_data *i2c_algo = priv;
-       struct cx88_core *core = i2c_algo->data;
+       struct cx88_core *core;
+
+       if (!i2c_algo) {
+               printk(KERN_ERR "cx88: Error - i2c private data undefined.\n");
+               return -EINVAL;
+       }
+
+       core = i2c_algo->data;
+
+       if (!core) {
+               printk(KERN_ERR "cx88: Error - device struct undefined.\n");
+               return -EINVAL;
+       }
 
        switch (core->board.tuner_type) {
                case TUNER_XC2028:
                        info_printk(core, "Calling XC2028/3028 callback\n");
-                       return cx88_xc2028_tuner_callback(priv, command, arg);
+                       return cx88_xc2028_tuner_callback(core, command, arg);
                case TUNER_XC5000:
                        info_printk(core, "Calling XC5000 callback\n");
-                       return cx88_xc5000_tuner_callback(priv, command, arg);
+                       return cx88_xc5000_tuner_callback(core, command, arg);
        }
        err_printk(core, "Error: Calling callback for tuner %d\n",
                   core->board.tuner_type);

diff --git a/drivers/media/video/saa7134/saa7134-cards.c b/drivers/media/video/saa7134/saa7134-cards.c
index b622d97..c323ca0 100644 (file)
--- a/drivers/media/video/saa7134/saa7134-cards.c
+++ b/drivers/media/video/saa7134/saa7134-cards.c
@@ -5266,6 +5266,9 @@ int saa7134_tuner_callback(void *priv, int command, int arg)
                case TUNER_XC2028:
                        return saa7134_xc2028_callback(dev, command, arg);
                }
+       } else {
+               printk(KERN_ERR "saa7134: Error - device struct undefined.\n");
+               return -EINVAL;
        }
        return -EINVAL;
 }