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selftests/damon/_damon_sysfs: check errors from nr_schemes file reads

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DAMON context staging method in _damon_sysfs.py is not checking the
returned error from nr_schemes file read.  Check it.

Link: https://lkml.kernel.org/r/20240503180318.72798-3-sj@kernel.org
Fixes: f5f0e5a2be ("selftests/damon/_damon_sysfs: implement kdamonds start function")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2024-05-03 11:03:10 -07:00 committed by Andrew Morton
parent b96a303b68
commit 732b8815c0
1 changed files with 2 additions and 0 deletions
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2
tools/testing/selftests/damon/_damon_sysfs.py
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@ -341,6 +341,8 @@ class DamonCtx:
nr_schemes_file = os.path.join(
self.sysfs_dir(), 'schemes', 'nr_schemes')
content, err = read_file(nr_schemes_file)
if err is not None:
return err
if int(content) != len(self.schemes):
err = write_file(nr_schemes_file, '%d' % len(self.schemes))
if err != None: