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This is done using "ifs_sem" defined in sysfs.c > > Ah I see. > > After taking a closer look I do see one unrelated issue with this patch > sysfs.c: run_test_store() does: > > if (!ifsd->loaded) > rc = -EPERM; > else > rc = do_core_test(cpu, dev); > > But AFAICT the loaded check really only applies to the first (intel_ifs_0 device) test type and the > Array BIST test should work fine when loaded is false. This is true, the load check only applies to first test. And the patch (5/8) in this series adds the check you are suggesting to allow the second test to proceed (as given below) if (ifsd->ro_info->test_num != IFS_TYPE_ARRAY_BIST && !ifsd->loaded) rc = -EPERM; else rc = do_core_test(cpu, dev); It is possible that the snippet you pasted above was from an earlier state. Jithu