[media] rtl28xxu: silence error log about disabled rtl2832_sdr module

It printed a little bit too heavy looking error log "DVB: Unable to
find symbol rtl2832_sdr_attach()" when staging module was disabled.
Silence that error by introducing own version of dvb_attach() macro
without the error logging.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

1 files changed, 23 insertions, 4 deletions

diff --git a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
index 3a7a5a7f95a7..dcbd392e6efc 100644
--- a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
+++ b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
@@ -55,6 +55,25 @@ static inline struct dvb_frontend *rtl2832_sdr_attach(struct dvb_frontend *fe,
 }
 #endif
 
+#ifdef CONFIG_MEDIA_ATTACH
+#define dvb_attach_sdr(FUNCTION, ARGS...) ({ \
+        void *__r = NULL; \
+        typeof(&FUNCTION) __a = symbol_request(FUNCTION); \
+        if (__a) { \
+                __r = (void *) __a(ARGS); \
+                if (__r == NULL) \
+                        symbol_put(FUNCTION); \
+        } \
+        __r; \
+})
+
+#else
+#define dvb_attach_sdr(FUNCTION, ARGS...) ({ \
+        FUNCTION(ARGS); \
+})
+
+#endif
+
 static int rtl28xxu_disable_rc;
 module_param_named(disable_rc, rtl28xxu_disable_rc, int, 0644);
 MODULE_PARM_DESC(disable_rc, "disable RTL2832U remote controller");
@@ -927,7 +946,7 @@ static int rtl2832u_tuner_attach(struct dvb_usb_adapter *adap)
                                 adap->fe[0]->ops.tuner_ops.get_rf_strength;
 
                 /* attach SDR */
-                dvb_attach(rtl2832_sdr_attach, adap->fe[0], &d->i2c_adap,
+                dvb_attach_sdr(rtl2832_sdr_attach, adap->fe[0], &d->i2c_adap,
                                 &rtl28xxu_rtl2832_fc0012_config, NULL);
                 break;
         case TUNER_RTL2832_FC0013:
@@ -939,7 +958,7 @@ static int rtl2832u_tuner_attach(struct dvb_usb_adapter *adap)
                                 adap->fe[0]->ops.tuner_ops.get_rf_strength;
 
                 /* attach SDR */
-                dvb_attach(rtl2832_sdr_attach, adap->fe[0], &d->i2c_adap,
+                dvb_attach_sdr(rtl2832_sdr_attach, adap->fe[0], &d->i2c_adap,
                                 &rtl28xxu_rtl2832_fc0013_config, NULL);
                 break;
         case TUNER_RTL2832_E4000: {
@@ -970,7 +989,7 @@ static int rtl2832u_tuner_attach(struct dvb_usb_adapter *adap)
                         i2c_set_adapdata(i2c_adap_internal, d);
 
                         /* attach SDR */
-                        dvb_attach(rtl2832_sdr_attach, adap->fe[0],
+                        dvb_attach_sdr(rtl2832_sdr_attach, adap->fe[0],
                                         i2c_adap_internal,
                                         &rtl28xxu_rtl2832_e4000_config, sd);
                 }
@@ -1001,7 +1020,7 @@ static int rtl2832u_tuner_attach(struct dvb_usb_adapter *adap)
                                 adap->fe[0]->ops.tuner_ops.get_rf_strength;
 
                 /* attach SDR */
-                dvb_attach(rtl2832_sdr_attach, adap->fe[0], &d->i2c_adap,
+                dvb_attach_sdr(rtl2832_sdr_attach, adap->fe[0], &d->i2c_adap,
                                 &rtl28xxu_rtl2832_r820t_config, NULL);
                 break;
         case TUNER_RTL2832_R828D: