save_post problem with auto-save

Hello,

I use the “save_post” hook to do something when a post gets saved. But the hook get instantly called when I click on “new post” button in my backend. I only want to do the stuff when a real post gets saved.

// Autosave, do nothing
			if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) 
					return;
			// AJAX? Not used here
			if ( defined( 'DOING_AJAX' ) && DOING_AJAX ) 
					return;
			// Check user permissions
			if ( ! current_user_can( 'edit_post', $post_id ) )
					return;
			// Return if it's a post revision
			if ( false !== wp_is_post_revision( $post_id ) )
					return;
                       

                        // my stuff