i2c: Handle i2c_add_adapter failure in i2c algorithm drivers

It is possible for i2c_add_adapter() to fail.  Several I2C algorithm
drivers ignore that fact.  This (compile-tested only) patch fixes them.
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Adrian Bunk <bunk@stusta.de>

drivers/i2c/algos/i2c-algo-bit.c

@@ -544,8 +544,7 @@ int i2c_bit_add_bus(struct i2c_adapter *adap)
 	adap->timeout = 100;	/* default values, should	*/
 	adap->retries = 3;	/* be replaced by defines	*/
 
-	i2c_add_adapter(adap);
-	return 0;
+	return i2c_add_adapter(adap);
 }
 
 

drivers/i2c/algos/i2c-algo-ite.c

@@ -742,10 +742,8 @@ int i2c_iic_add_bus(struct i2c_adapter *adap)
 	adap->retries = 3;		/* be replaced by defines	*/
 	adap->flags = 0;
 
-	i2c_add_adapter(adap);
 	iic_init(iic_adap);
-
-	return 0;
+	return i2c_add_adapter(adap);
 }
 
 

drivers/i2c/algos/i2c-algo-pca.c

@@ -374,10 +374,10 @@ int i2c_pca_add_bus(struct i2c_adapter *adap)
 	adap->timeout = 100;		/* default values, should	*/
 	adap->retries = 3;		/* be replaced by defines	*/
 
-	rval = pca_init(pca_adap);
+	if ((rval = pca_init(pca_adap)))
+		return rval;
 
-	if (!rval)
-		i2c_add_adapter(adap);
+	rval = i2c_add_adapter(adap);
 
 	return rval;
 }

drivers/i2c/algos/i2c-algo-pcf.c

@@ -479,9 +479,11 @@ int i2c_pcf_add_bus(struct i2c_adapter *adap)
 	adap->timeout = 100;		/* default values, should	*/
 	adap->retries = 3;		/* be replaced by defines	*/
 
-	rval = pcf_init_8584(pcf_adap);
-	if (!rval)
-		i2c_add_adapter(adap);
+	if ((rval = pcf_init_8584(pcf_adap)))
+		return rval;
+
+	rval = i2c_add_adapter(adap);
+
 	return rval;
 }
 

drivers/i2c/algos/i2c-algo-sibyte.c

@@ -173,9 +173,7 @@ int i2c_sibyte_add_bus(struct i2c_adapter *i2c_adap, int speed)
 		printk("\n");
 	}
 
-	i2c_add_adapter(i2c_adap);
-
-	return 0;
+	return i2c_add_adapter(i2c_adap);
 }