V4L/DVB (7802): tuner: Failures at tuner_attach were producing OOPS

As reported by Mike Galbraith <efault@gmx.de>:

[   13.666587] TUNER: Unable to find symbol tda829x_probe()
[   13.674638] tuner' 1-004b: chip found @ 0x96 (saa7133[0])
[   13.691175] DVB: Unable to find symbol tda9887_attach()
[   13.698968] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
[   13.709509] IP: [<ffffffff80302934>] strlcpy+0x11/0x36
[   13.711135] PGD be167067 PUD be140067 PMD 0
[   13.711137] Oops: 0000 [1] SMP

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

1 files changed, 13 insertions, 15 deletions

diff --git a/drivers/media/video/tuner-core.c b/drivers/media/video/tuner-core.c
index c8cd718675ab..b5dacde023ee 100644
--- a/drivers/media/video/tuner-core.c
+++ b/drivers/media/video/tuner-core.c
@@ -340,16 +340,6 @@ static void tuner_i2c_address_check(struct tuner *t)
         tuner_warn("====================== WARNING! ======================\n");
 }
 
-static void attach_tda829x(struct tuner *t)
-{
-        struct tda829x_config cfg = {
-                .lna_cfg        = t->config,
-                .tuner_callback = t->tuner_callback,
-        };
-        dvb_attach(tda829x_attach,
-                   &t->fe, t->i2c->adapter, t->i2c->addr, &cfg);
-}
-
 static struct xc5000_config xc5000_cfg;
 
 static void set_type(struct i2c_client *c, unsigned int type,
@@ -385,12 +375,19 @@ static void set_type(struct i2c_client *c, unsigned int type,
 
         switch (t->type) {
         case TUNER_MT2032:
-                dvb_attach(microtune_attach,
-                           &t->fe, t->i2c->adapter, t->i2c->addr);
+                if (!dvb_attach(microtune_attach,
+                           &t->fe, t->i2c->adapter, t->i2c->addr))
+                        goto attach_failed;
                 break;
         case TUNER_PHILIPS_TDA8290:
         {
-                attach_tda829x(t);
+                struct tda829x_config cfg = {
+                        .lna_cfg        = t->config,
+                        .tuner_callback = t->tuner_callback,
+                };
+                if (!dvb_attach(tda829x_attach, &t->fe, t->i2c->adapter,
+                                t->i2c->addr, &cfg))
+                        goto attach_failed;
                 break;
         }
         case TUNER_TEA5767:
@@ -441,8 +438,9 @@ static void set_type(struct i2c_client *c, unsigned int type,
                 break;
         }
         case TUNER_TDA9887:
-                dvb_attach(tda9887_attach,
-                           &t->fe, t->i2c->adapter, t->i2c->addr);
+                if (!dvb_attach(tda9887_attach,
+                           &t->fe, t->i2c->adapter, t->i2c->addr))
+                        goto attach_failed;
                 break;
         case TUNER_XC5000:
         {