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selftests: gpio: gpio-aggregator: add a test case for _sysfs prefix reservation

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The kernel doc for gpio-aggregator configfs interface, which was recently
added, states that users should not be able to create an aggregator with a
name prefixed by "_sysfs" via configfs. However, it was found that this
guard does not function as expected (thanks to Dan Carpenter for
identifying and fixing the issue).

Add a test case to verify the guard.

Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Link: https://lore.kernel.org/r/20250412150119.1461023-1-koichiro.den@canonical.com
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
This commit is contained in:
Koichiro Den
2025-04-13 00:01:19 +09:00
committed by Bartosz Golaszewski
parent d945ff5264
commit 290ffcfe30
1 changed files with 4 additions and 0 deletions
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4
tools/testing/selftests/gpio/gpio-aggregator.sh
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@@ -335,6 +335,10 @@ test "$(cat "$CONFIGFS_AGG_DIR/agg0/live")" = 0 || \
agg_remove_line agg0 line0
agg_remove_chip agg0
echo "1.1.6. Can't instantiate a chip with _sysfs prefix"
mkdir "$CONFIGFS_AGG_DIR/_sysfs" 2> /dev/null && fail "chip _sysfs unexpectedly created"
mkdir "$CONFIGFS_AGG_DIR/_sysfs.foo" 2> /dev/null && fail "chip _sysfs.foo unexpectedly created"
echo "1.2. Creation/deletion via sysfs"
echo "1.2.1. Minimum creation/deletion"