Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_20079931_4 ( round VARCHAR, circuit_location VARCHAR, pole_position VARCHAR )

### Question ###
How many rounds were there in Karlskoga Motorstadion with Roger Eriksson at the pole position?

### Accurate SQL ###

SELECT COUNT(round) FROM table_20079931_4 WHERE circuit_location = "Karlskoga Motorstadion" AND pole_position = "Roger Eriksson"