You would do well to post the actual code you are running; without the do_something sub, we can't give you specific help. I can, however, confirm that dispatch table subs can take parameters:

my %dispatch = ( something => \&my_sub );

$dispatch{something}->("Hello, world.");

sub my_sub {
    my $param = shift;
    print "my_sub says `$param'";
}
__END__

Output:
my_sub says `Hello, world.'
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